Recent Publications

The m4 3D Printer: A multi-material multi-method additive manufacturing platform for future 3D printed structures

Many existing 3D printing technologies only allow one material to be printed at one time, while many applications require the integration of different materials, which sometimes cannot be printed by one AM technology. In this paper, a novel multi-material multi-method (m4) 3D printer comprised of multiple AM technologies is presented as a solution to the current limitations. This printer fosters the advancement of AM by combining materials traditionally unable to be printed concurrently while adding functionality to printed parts.

Roach, D. J., Hamel, C. M., Dunn, C. K., Johnson, M. V., Kuang, X., & Qi, H. J. (2019). The m4 3D Printer: A multi-material multi-method additive manufacturing platform for future 3D printed structures. Additive Manufacturing, 100819.


Design for 4D printing: Modeling and computation of smart materials distributions

The material complexity allowed by additive manufacturing (AM) has made smart materials (SMs) processing easier, giving birth to the so called 4D printing (4DP). But, for this expanded design space to be embraced by designers, there is the need to make SMs modeling and simulation easier, especially in conceptual design. Here, a twofold contribution is made to design for 4DP. First a computational tool, VoxSmart, employing the previously developed theoretical framework is introduced. Given a source shape and a target shape, a set of materials, and a stimulus, finding the right material distribution that yields the appropriate transformation under stimulus is quite challenging. Addressing this issue is the focus of this work’s second contribution.

Sossou, G., Demoly, F., Belkebir, H., Qi, H. J., Gomes, S., & Montavon, G. (2019). Design for 4D printing: Modeling and computation of smart materials distributions. Materials & Design, 108074.


Dynamic Photomask-Assisted Direct Ink Writing Multimaterial for Multilevel Triboelectric Nanogenerator

Triboelectric nanogenerator (TENG) devices are extensively studied as a mechanical energy harvester and self‐powered sensor for wearable electronics and physiological monitoring. Here, the printed multimaterial matrix for multilevel mechanical‐responsive TENG with on‐demand reconfiguration of shape is reported. Multimaterial structures with location‐specific properties, such as tensile modulus, failure stress, and glass transition temperature for controlled deformation, crack propagation path, and sequential shape memory, are directly printed. This work provides a new approach to combine multimaterial 3D printing with TENG devices for functional wearable electronics as energy harvester and sensors.

Chen, K., Zhang, L., Kuang, X., Li, V., Lei, M., Kang, G., … & Qi, H. J. (2019). Dynamic Photomask‐Assisted Direct Ink Writing Multimaterial for Multilevel Triboelectric Nanogenerator. Advanced Functional Materials, 1903568.


3D printing of auxetic metamaterials with digitally reprogrammable shape

Two-dimensional lattice structures with specific geometric features have been reported to have a negative Poisson’s ratio, termed as auxetic metamaterials, i.e., stretching induces expansion in the transversal direction. In this paper, we designed a novel auxetic metamaterial, which by utilizing the shape memory effect of the constituent materials, the in-plane moduli and Poisson’s ratios can be continuously tailored. Finally, we designed and fabricated gradient/digital patterns and cylindrical shells and used the auxetics and shape memory effects to reshape the printed structures.

Lei, M., Hong, W., Zhao, Z., Hamel, C. M., Chen, M., Lu, H., & Qi, H. J. (2019). 3D printing of auxetic metamaterials with digitally reprogrammable shape. ACS applied materials & interfaces.


Long Liquid Crystal Elastomer Fibers with Large Reversible Actuation Strains for Smart Textiles and Artificial Muscles

A method for fabricating long, soft, and reversibly actuatable liquid crystal elastomer (LCE) fibers by using direct ink write (DIW) printing was developed. Upon optimizing the ink viscosity and DIW printing parameters, long fibers (up to 1.5 m long from the laboratory) were obtained. The LCE fibers were knit, sewn, and woven to form a variety of smart textiles. The fiber was also used to mimic bicep muscles with both large activation force and activation strain. By incorporating further intelligent characteristics, such as conductivity and biosensing into a single fiber, the LCE fibers could be potentially used for smart clothing, soft robotics, and biomedical devices.

Roach, D. J., Yuan, C., Kuang, X., Li, V. C. F., Blake, P., Romero, M. L., … & Qi, H. J. (2019). Long Liquid Crystal Elastomer Fibers with Large Reversible Actuation Strains for Smart Textiles and Artificial Muscles. ACS applied materials & interfaces.


Reaction-Diffusion Model for Thermosetting Polymer Dissolution through Exchange Reactions Assisted by Small-Molecule Solvents

Thermosetting polymers involving dynamic bonds or exchange reactions (also known as vitrimers) can be fully dissolved in a solvent utilizing a small-molecule-participated bond-exchange reaction (BER). However, dissolution is a complex process that couples chemical reactions with the diffusion featured by varied diffusivity both in time and dimension. Here, a reaction-diffusion model is developed for the vitrimer dissolution in alcohol via transesterification. This work provides a deep insight into the reaction-diffusion process, which can be used to guide the future development and optimize recycling processes using dynamic bonds.

Hamel, C. M., Kuang, X., Chen, K., & Qi, H. J. (2019). Reaction-Diffusion Model for Thermosetting Polymer Dissolution through Exchange Reactions Assisted by Small-Molecule Solvents. Macromolecules.


Three-Dimensionally Printed Mechanical Metamaterials With Thermally Tunable Auxetic Behavior

In this work, we demonstrate the dynamic and on-demand regulation of mechanical metamaterials through a combination of structural design and multimaterial 3D printing. We design a soft periodic lattice metamaterial containing two distinct deformation modes. One deformation mode is controlled by the zig-zagged topological defects, and the other one is controlled by the thermal activation of the responsive materials imbedded in the lattice. We believe our design principle opens up a new route for the exploration of metamaterials exhibiting extraordinary and programmable mechanical behaviors.

Zhao, Z., Yuan, C., Lei, M., Yang, L., Zhang, Q., Chen, H., Qi, H. J., & Fang, D. (2019). Three-Dimensionally Printed Mechanical Metamaterials With Thermally Tunable Auxetic Behavior. Physical Review Applied11(4), 044074.


Design for 4D printing: A voxel-based modeling and simulation of smart materials

In this article, a modeling framework for simulating smart materials (SMs) and conventional materials behaviors on a voxel basis is proposed; this allows for arranging materials in any distribution and rapidly evaluating the behavior of the distribution. Homogeneous and heterogeneous objects made of conventional materials and SMs were modeled and simulated. These simulations have a speed reasonable for the design iterations needed in conceptual design phase and they yield results in good agreement with physics.

Sossou , G., Demoly, F., Belkebir, H., Qi, H. J., Gomes, S., & Montavon, G. (2019). Design for 4D printing: A voxel-based modeling and simulation of smart materials. Materials & Design, 107798.


Cellulose Nanocrystals Support Material for 3D Printing Complexly Shaped Structures via Multi-Materials-Multi-Methods Printing

To fabricate highly complex structures, sacrificial support material is usually needed. However, traditional petroleum-based support materials are unsustainable, non-recyclable, and difficult to be completely removed from the target structure after 3D printing. In this work, we demonstrate how cellulose nanocrystal (CNC) gels can address all three of these challenges. We show that the CNC gel can easily be removed with water even in highly confined environments.

Li, V. C. F., Kuang, X., Hamel, C. M., Roach, D., Deng, Y., & Qi, H. J. (2019). Cellulose Nanocrystals Support Material for 3D Printing Complexly Shaped Structures via Multi-Materials-Multi-Methods Printing. Additive Manufacturing.


Machine-learning Based Design of Active Composite Structures for 4D Printing

In this work our aim is to find ideal material distributions for attaining a target shape during 4D printing. Due to the non-linear response of the material and the inverse nature of the problem traditional optimization approaches are limited to one type of material or environmental stimulation. These restrictions and recent advances in computer power inspired our group to use machine learning based techniques to find optimal material distributions for 4D printing applications. Briefly, we utilize evolutionary algorithms in conjunction with finite element simulations to discover ideal material distributions.

Hamel, C., Roach, D., Long, K., Demoly, F., Dunn, M., & Qi, J. (2019). Machine-learning Based Design of Active Composite Structures for 4D Printing. Smart Materials and Structures.


A Viscoelastic Model for Hydrothermally Activated Malleable Covalent Network Polymer and its Application in Shape Memory Analysis

Recently proposed polyimine-based malleable covalent network polymers (MCNPs) show water or temperature induced shape reforming under low temperatures. This work provides understandings and design guidelines for the hydrothermal-activated malleable covalent network polymer.

Mao, Y., Chen, F., Hou, S., Qi, H. J., & Yu, K. (2019). A Viscoelastic Model for Hydrothermally Activated Malleable Covalent Network Polymer and its Application in Shape Memory Analysis. Journal of the Mechanics and Physics of Solids.


Extraction of Biolubricant via Chemical Recycling of Thermosetting Polymers

Extracting biolubricant of dicarboxylic acid ester via chemical recycling of thermoset waste can reduce environmental pollution and alleviate petrochemical consumption.

Kuang, X., Guo, E., Chen, K., & Qi, H. J. (2019). Extraction of Biolubricant via Chemical Recycling of Thermosetting Polymers. ACS Sustainable Chemistry & Engineering , 7 (7), 6880-6888


3D printed cellulose nanocrystal composites through digital light processing

Cellulose Nanocrystals (CNC) have received significant attention due to their high Young’s modulus, high strength, biocompatibility, and renewability. These properties make them ideal as a reinforcement phase for polymer composites. This work utilized the digital light processing (DLP) 3D printing approach to fabricate CNC reinforced PEGDA glycerol composites. Mechanical testing results indicated that mechanical properties of DLP 3D printed composites were improved by CNC incorporation.

Li, V. C.-F., Kuang, X., Mulyadi, A., Hamel, C. M., Deng, Y., & Qi, H. J. (2019). 3D printed cellulose nanocrystal composites through digital light processing. Cellulose.


PUBLICATIONS – BOOK CHAPTERS

  1. Yu, K., Qi, H.J., 2016. “Chapter 7. Viscoelasticity Based Models for Thermally Activated Systems”, in “Shape Memory Polymers for Aerospace Applications: Novel Activation, Modeling, Characterization and Design”, Ed. G.P. Tandon, A.J.Q. McClung, J.W. Baur, DEStech Publications. (The book will be published in the summer of 2015, carrying a 2016 copyright).
  2.  Dunn, M., Qi, H.J., 2016. “Chapter 18. Active Origami”, in “Shape Memory Polymers for Aerospace Applications: Novel Activation, Modeling, Characterization and Design”, Ed. G.P. Tandon, A.J.Q. McClung, J.W. Baur, DEStech Publications. (The book will be published in the summer of 2015, carrying a 2016 copyright).
  3. Qi, H.J., Dunn, M.L., 2010.  “Chapter 3. Thermomechanical Behavior and Modeling Approaches” in “Shape-Memory Polymers and Multifunctional Composites ”, Ed. JS Leng, SY Du, CRC Press, pp65-90.
  4. Qi, H.J., Bruet, B.J.F., Palmer, J.S., Ortiz, C., Boyce, M.C., 2006. Micromechanics and macromechanics of the tensile deformation of nacre, in Mechanics of Biological Tissue, Springer, Berlin Heidelberg, pp189-203.

PUBLICATIONS – ACHIEVED JOURNALS

2020

  1. Zhang, B., Li, H., Yuan, C., Dunn, M.L., Qi, H.J., Yu, K., Shi, Q. and Ge, Q., 2020. Influences of processing conditions on mechanical properties of recycled epoxy‐anhydride vitrimers. Journal of Applied Polymer Science, 137(41), p.49246.
  2. Roach, D.J., Roberts, C., Wong, J., Kuang, X., Kovitz, J., Zhang, Q., Spence, T.G. and Qi, H.J., 2020. Surface Modification of Fused Filament Fabrication (FFF) 3D Printed Substrates by Inkjet Printing Polyimide for Printed Electronics. Additive Manufacturing, p.101544.
  3. Hamel, C.M., Kuang, X. and Qi, H.J., 2020. Modeling the dissolution of thermosetting polymers and composites via solvent assisted exchange reactions. Composites Part B: Engineering, p.108363.
  4. Zhang, S.L., Roach, D.J., Xu, S., Wang, P., Zhang, W., Qi, H.J. and Wang, Z.L., 2020. Electromagnetic Pulse Powered by a Triboelectric Nanogenerator with Applications in Accurate Self‐Powered Sensing and Security. Advanced Materials Technologies, p.2000368.
  5. Kuang, X., Roach, D., Hamel, C., Yu, K. and Qi, J., 2020. Materials, Design and Fabrication of Shape Programmable Polymers.  Multifunctional Materials.
  6. Zhao, Z., Wu, D., Chen, H.S., Qi, H.J. and Fang, D., 2020. Indentation experiments and simulations of nonuniformly photocrosslinked polymers in 3D printed structures. Additive Manufacturing, p.101420.
  7. Zhang, Q., Peng, X., Weng, S., Zhang, R., Fang, D., Zhao, R. and Qi, H.J., 2020. Self-adaptive flexible valve as passive flow regulator. Extreme Mechanics Letters, p.100824.
  8. Kuang, X. and Qi, H.J., 2020. Modular 4D Printing Assisted by Dynamic Chemical Bonds. Matter, 2(5), pp.1080-1082.
  9. Chen, Z., Shi, Q., Kuang, X., Qi, H.J. and Wang, T., 2020. Ultrastrong intrinsic bonding for thermoset composites via bond exchange reactions. Composites Part B: Engineering, p.108054.
  10. Zhang, Q., Kuang, X., Weng, S., Zhao, Z., Chen, H., Fang, D. and Qi, H.J., 2020. Rapid volatilization induced mechanically robust shape-morphing structures toward 4D printing. ACS Applied Materials & Interfaces, 12(15), pp.17979-17987.
  11. Wu, S., Hamel, C.M., Qi, H.J. and Zhao, R., 2020. Evolutionary Algorithm Guided Voxel-Encoding Printing of Functional Hard-Magnetic Soft Active Materials. arXiv preprint arXiv:2001.11189.
  12. Chen, Z., Sun, Y.C., Wang, J., Qi, H.J., Wang, T. and Naguib, H.E., 2020. Flexible, Reconfigurable, and Self-Healing TPU/Vitrimer Polymer Blend with Copolymerization Triggered by Bond Exchange Reaction. ACS Applied Materials & Interfaces, 12(7), pp.8740-8750.
  13. Li, H., Zhang, B., Yu, K., Yuan, C., Zhou, C., Dunn, M.L., Qi, H.J., Shi, Q., Wei, Q.H., Liu, J. and Ge, Q., 2020. Influence of treating parameters on thermomechanical properties of recycled epoxy-acid vitrimers. Soft Matter.
  14. Ze, Q., Kuang, X., Wu, S., Wong, H., Montgomery, S.M., Zhang, R., Kovitz, J.M., Yang, F., Qi, H.J., Zhao, R., 2020. Magnetic Shape Memory Polymers with Integrated Multifunctional Shape Manipulation. Advanced Materials. 32 (4), 1906657.
  15. Chen, Z., Sun, Y., Wang, J., Qi, H.J., Wang, T., Naguib, H.E., 2020. Flexible, Reconfigurable, and Self-healing TPU/Vitrimer Polymer Blend with Copolymerization Triggered by Bond Exchange Reaction. ACS Applied Materials & Interfaces, online.


    2019

  16. Chen, Z., Yang, M., Shi, Q., Kuang, X., Qi, H.J., Wang, T., 2019. Recycling Waste Circuit Board Efficiently and Environmentally Friendly through Small-Molecule Assisted Dissolution, Scientific Reports. 9 (1), 1-9
  17. Jiang, X., Ren, Z., Fu, Y., Liu, Y., Zou, R., Ji, G., Ning, H., Li, Y., Wen, J., Qi, H.J., Xu, X., Fu, S., Qiu, J., Hu, N., 2019. Highly Compressible and Sensitive Pressure Sensor under Large Strain Based on 3D Porous Reduced Graphene Oxide Fiber Fabrics in Wide Compression Strains. ACS Applied Materials & Interfaces. 11 (40), 37051-37059 (selected as a cover
  18. Roach, D. J., Hamel, C. M., Dunn, C. K., Johnson, M. V., Kuang, X., & Qi, H. J. (2019). The m4 3D Printer: A multi-material multi-method additive manufacturing platform for future 3D printed structures. Additive Manufacturing, 100819.
  19. Sossou, G., Demoly, F., Belkebir, H., Qi, H. J., Gomes, S., & Montavon, G. (2019). Design for 4D printing: Modeling and computation of smart materials distributions. Materials & Design, 108074.
  20. Chen, K., Zhang, L., Kuang, X., Li, V., Lei, M., Kang, G., … & Qi, H. J. (2019). Dynamic Photomask‐Assisted Direct Ink Writing Multimaterial for Multilevel Triboelectric Nanogenerator. Advanced Functional Materials, 1903568.
  21. Lei, M., Hong, W., Zhao, Z., Hamel, C. M., Chen, M., Lu, H., & Qi, H. J. (2019). 3D printing of auxetic metamaterials with digitally reprogrammable shape. ACS applied materials & interfaces.
  22. Roach, D. J., Yuan, C., Kuang, X., Li, V. C. F., Blake, P., Romero, M. L., … & Qi, H. J. (2019). Long Liquid Crystal Elastomer Fibers with Large Reversible Actuation Strains for Smart Textiles and Artificial Muscles. ACS applied materials & interfaces.
  23. Hamel, C. M., Kuang, X., Chen, K., & Qi, H. J. (2019). Reaction-Diffusion Model for Thermosetting Polymer Dissolution through Exchange Reactions Assisted by Small-Molecule Solvents. Macromolecules.
  24. Zhao, Z., Yuan, C., Lei, M., Yang, L., Zhang, Q., Chen, H., Qi, H. J., & Fang, D. (2019). Three-Dimensionally Printed Mechanical Metamaterials With Thermally Tunable Auxetic Behavior. Physical Review Applied11(4), 044074.
  25. Sossou, G., Demoly, F., Belkebir, H., Qi, H. J., Gomes, S., & Montavon, G. (2019). Design for 4D printing: A voxel-based modeling and simulation of smart materials. Materials & Design, 107798.
  26. Li, V. C. F., Kuang, X., Hamel, C. M., Roach, D., Deng, Y., & Qi, H. J. (2019). Cellulose Nanocrystals Support Material for 3D Printing Complexly Shaped Structures via Multi-Materials-Multi-Methods Printing. Additive Manufacturing.
  27. Hamel, C., Roach, D., Long, K., Demoly, F., Dunn, M., & Qi, H. J. (2019). Machine-learning Based Design of Active Composite Structures for 4D Printing. Smart Materials and Structures.
  28. Mao, Y., Chen, F., Hou, S., Qi, H. J., & Yu, K. (2019). A Viscoelastic Model for Hydrothermally Activated Malleable Covalent Network Polymer and its Application in Shape Memory Analysis. Journal of the Mechanics and Physics of Solids.
  29. Kuang, X., Guo, E., Chen, K., & Qi, H. J. (2019). Extraction of Biolubricant via Chemical Recycling of Thermosetting Polymers. ACS Sustainable Chemistry & Engineering , 7 (7), 6880-6888
  30. Yang, H., Li, C., Yang, M., Pan, Y., Yin, Q., Tang, J., Qi, H.J., & Suo, Z. (2019). Printing Hydrogels and Elastomers in Arbitrary Sequence with Strong Adhesion. Advanced Functional Materials, 1901721.
  31. Li, V. C.-F., Kuang, X., Mulyadi, A., Hamel, C. M., Deng, Y., & Qi, H. J. (2019). 3D printed cellulose nanocrystal composites through digital light processing. Cellulose.
  32. Zhang, B., Yuan, C., Zhang, W., Dunn, Martin L., Qi, H. J., Liu, Z., . . . Ge, Q. (2019). Recycling of vitrimer blends with tunable thermomechanical properties. RSC Advances, 9(10), 5431-5437.
  33. Zhao, Z., Qi, H. J., & Fang, D. (2019). A finite deformation theory of desolvation and swelling in partially photo-cross-linked polymer networks for 3D/4D printing applications. Soft Matter, 15(5), 1005-1016.
  34. X. Kuang, D. J. Roach, J. Wu, C. M. Hamel, Z. Ding, T. Wang, M. L. Dunn, H. J. Qi, Adv. Funct. Mater. 2018, 29, 1805290.


    2018

  35. (Invited review) Kuang, X., Roach, D.J., Wu, J., Hamel, C.M., Wang, T. Dunn, M.L., Qi, H.J., 2018. Advance in 4D Printing: Materials and Applications. Advanced Functional Materials, 1805290.
  36. Roach, D.J., Kuang, X., Yuan, C., Chen, K., Qi, H.J., 2018. Novel ink for ambient condition printing of liquid crystal elastomers for 4D printing. Smart Materials and Structures, 27 (12), 125011.
  37. Zhao, Z., Kuang, X., Wu, J., Zhang, Q., Paulino, G., Qi, H.J., Fang, D., 2018. 3D Printing of Complex Origami Assemblages for Reconfigurable Structures. Soft Matter, 14(39), 8051-8059.
  38. Kuang, X., Zhou, Y., Shi, Q., Wang, T., Qi, H.J., 2018. Recycling of Epoxy Thermoset and Composites via Good Solvent Assisted and Small Molecules Participated Exchange Reactions. ACS Sustainable Chemistry & Engineering, 6(7), 9189-9197.
  39. Zhao, Z., Kuang, X., Yuan, C., Qi, H.J., Fang, D., 2018. Hydrophilic/hydrophobic composite shape shifting structures. ACS Applied Materials & Interfaces, 10(23), 19923-19939.
  40. *Wu, J., Zhao, Z., Kuang, X., Hamel, C., Fang, D., Qi, H.J., 2018. Reversible shape change structures by grayscale pattern 4D printing, Multifunctional Materials, 1 (1), 015002.
  41. Qin, M., Sun, M., Bai, R., Mao, Y., Qian, X., Sikka, D., Zhao, Y., Qi, H.J., Suo, Z., He, X., 2018. Bioinspired Hydrogel Interferometer for Adaptive Coloration and Chemical Sensing. Advanced Materials, 1800468.
  42. *Mu, Q., Lei, M., Roach, D., Dunn, C., Kuang, X., Yuan, C., Wang, T., Qi, H.J., 2018. Intense Pulsed Light Sintering of Thick Conductive Wires on Dark Elastomeric Substrate for Hybrid 4D Printing Applications. Smart Materials and Structures, 27(11), 115007.
  43. *Deng, J., Kuang, X., Liu, R., Ding, W., Wang, A.C., Lai, Y. Dong, K., Wen, Z., Wang, Y., Qi, H.J., Zhang, T., Wang, Z.L., 2018. Vitrimer Elastomer‐Based Jigsaw Puzzle‐Like Healable Triboelectric Nanogenerator for Self‐Powered Wearable Electronics, Advanced Materials, 1705918.
  44. *Wu, J., Zhao, Z., Hamel, C.M., Mu, X., Kuang, X., Guo, Z., Qi, H.J., 2018. Evolution of material properties during free radical photopolymerization, Journal of Mechanics and Physics of Solids, 112:25-49.
  45. Ding, Z., Weeger, O., Qi, H.J., Dunn, M.L., 2018. 4D rods: 3D structure via programmable 1D composite rods, Materials & Design, 137, 256-265.
  46. *Liu, R., Kuang, X., Deng, J., Wang Y, Wang A.C., Ding, W., Lai, Y., Chen, J., Wang, P., Lin, Z., Qi, H.J., Sun, B., Wang, Z.L., 2018. Shape Memory Polymers for Body Motion Energy Harvesting and Self‐Powered Mechanosensing, Advanced Materials. 1705195.
  47. *Lei, M., Hamel, C.M., Yuan, C., Lu, H., and Qi, H.J., 2018. 3D printing two dimensional periodic structures to tailor in-plane dynamic responses and fracture behaviors. Composites Science and Technology. 159, 189-198.
  48. Zhang, Q., Roach, D.J., Geng, L., Chen, H., Qi, H.J., Fang, D. 2018. Highly stretchable and conductive fibers enabled by liquid metal coating. Smart Materials and Structures, 27(3), 035019.
  49. *Kuang, X., Zhao, Z., Chen, , Fang, D., Kang, G., and Qi, H.J., 2018. High Speed 3D Printing of High-performance Thermosetting Polymers via Two-stage Curing. Macromolecular Rapid Communication, 1700809.
  50. *Kuang, X., Shi, Q., Zhou, Y., Zhao, Z., Wang, T., and Qi, H.J., 2018. Dissolution of Epoxy Thermosets via Mild Alcoholysis: the Mechanism and Kinetics Study. RSC Advances, 8, 1493-1502.
  51. *Kuang, X., Chen, K., Dunn, C.K., Wu, W., Li, V., and Qi, H.J., 2018. 3D Printing of Highly Stretchable, Shape-Memory and Self-Healing Elastomer toward Novel 4D Printing. ACS Applied Materials & Interfaces, 10:8, 7381-7388.
  52. *Li, V.C.F., Mulyadi, A., Dunn, C.K., Deng, Y., and Qi, H.J.,2018. Direct Ink Write (DIW) 3D Printed Cellulose Nanofiber Aerogel Structures with Highly Deformable, Shape Recoverable and Functionalizable Properties. ACS Sustainable Chemistry & Engineering. In press.
  53. *Yuan, C., Mu, X., Dunn, C.K., Haidar, J., Wang, T.J., Qi, H.J., 2018. Thermomechanically triggered two-stage pattern switching of two dimensional lattices for adaptive structures. Advanced Functional Materials, 1705727.
  54. *Chen, K., Kuang, X., Li, V., Kang, G., Qi, H.J., 2018. Fabrication of Tough Epoxy with Shape Memory Effects by UV-assisted Direct-ink Write Printing. Soft Matter, 14(10), 1879-1886.
  55. Che, K., Yuan, C., Qi, H.J., Meaud, J., 2018. Viscoelastic multistable architected materials with temperature-dependent snapping sequence, Soft Matter, 14 (13), 2492-2499.
  56. Lu, T., Chen, Z., Qi, H.J., Wang, T.J., 2018. A Micro-Structure Based Constitutive Model for Anisotropic Stress-Strain Behaviors of Artery Tissues. International Journal of Solid and Structures, v139-140, 55-64.


    2017

  57. *Roach, D.J., Hamel, C.M., Wu, J., Kuang, X., Dunn, M.L., Qi, H.J., 2017. 4-D Printing: Potential Applications of 3-D Printed Active Composite Materials, Journal of HDIAC (Journal of the Homeland Defense & Security Information Analysis Center), Vol 4., Iss. 4, pp 20-27.
  58. Wang, Y., Yu, K., Qi, H.J., Xiao, J., 2017. Temperature dependent evolution of wrinkled single-crystal silicon ribbons on shape memory polymer, Soft Matter, 13(41), 7625-7632.
  59. Chen, K. J., Kang, G. Z., Yu, C., Jiang, H., Qi, H. J., 2017. Non-proportional multiaxial ratchetting of ultrahigh molecular weight polyethylene polymer: Experiments and constitutive model. Mechanics of Materials, 112:76-87.
  60. *Yuan, C., Ding, Z., Wang, T.J., Dunn, M.L., Qi, H.J., 2017. Shape Forming by Thermal Expansion Mismatch and Shape Memory Locking in Polymer/Elastomer Laminates, Smart Materials and Structures, 26, 105027 (12pp).
  61. *Mu, Q., Wang, L., Dunn, C.K., Duan, F., Zhang, Z., Qi, H.J., Wang T., 2017. Digit light processing 3D printing of conductive complex structures, Additive Manufacturing, 18:74-83.
  62. *Li, V.C., Dunn, C.K., Zhang, Z., Qi, H.J., Deng, Y., 2017. Direct Ink Write (DIW) 3D Printed Cellulose Nanocrystal Aerogel Structures, Scientific Reports, 7:8018.
  63. *Yuan, C., Roach, R., Dunn, C., Mu, Q., Kuang, X., Yakacki, C., Wang, T.J., Yu, K., Qi, H.J., 2017. 3D printed reversible shape changing soft actuator assisted by liquid crystal elastomer, Soft Matter, 13:5558-5568.
  64. *Yuan, C., Wang, T.J., Dunn, M.L., Qi, H.J., 2017. 3D Printed Active Origami with Complicated Folding Patterns, International Journal of Precision Engineering and Manufacturing-Green Technology, 4(3), 281-289.
  65. *Liu, K., Wu, J., Paulino, G., QI, H.J., 2017. Programmable Deployment of Tensegrity Structures by Stimulus-Responsive Polymers, Scientific Reports, 7:3511.
  66. *Shi, Q., Yu, K., Kuang, X., Mu, X., Dunn, C., Dunn, M.L., Wang, T., Qi, H.J., 2017, Recyclable 3D Printing of Vitrimer Epoxy, Materials Horizons, 4, 598-607.
  67. *Mu, X., Berton, T., Dunn, C., Zhao, Z., Wu, J., Saldana, C., Qi, H.J., 2017. Porous Polymeric Materials by 3D Printing of Photocurable Resin. Materials Horizons, 4(3), 442-449.
  68. *Ding, Z, Yuan, C., Peng, X., Wang, T., Qi, H.J., Dunn, M., 2017. Direct 4D Printing via Active Composite Materials. Science Advances, e1602890.
  69. *Che, K., Yuan, C., Wu, J., Qi, H.J., and Meaud, J., 2017. 3D-printed multistable mechanical metamaterials with a deterministic deformation sequence. Journal of Applied Mechanics, 84:011004.
  70. *Zhao, Z., Wu, J., Mu, X., Chen, H., Qi, H.J., Fang, D., 2017. Origami by Frontal Photopolymerization, Science Advances, 3:e1602326.
  71. *Lei, M., Yu, K., Lu, H., Qi, H.J., 2017. Influence of structural relaxation on thermomechanical and shape memory performances of amorphous polymers, Polymer, 109, 216-228.
  72. *Zhao, Z., Wu, J., Mu, X., Qi, H.J., Fang, D., 2017. Desolvation induced origami of photocurable polymers by direct light processing, Macromolecular Rapid Communication, 38(13).
  73. *Mu, Q., Dunn, C., Wang, L., Dunn, M.L., Qi, H.J., Wang, T., 2017. Thermal cure effects on electromechanical properties of conductive wires by direct ink write for 4D printing and soft machines. Smart Materials and Structures, 26, 045008.


    2016

  74. Ge, Q., Serjouei , A., Qi, H.J., Dunn, ML., 2016. Thermomechanics of printed anisotropic shape memory elastomeric composites. International Journal of Solids and Structures, 102 (186-199).
  75. *Shi, Q., Yu, K., Dunn, M.L., Wang, T., Qi, H.J., 2016. Solvent assisted pressure-free surface welding and reprocessing of malleable epoxy polymers. Macromolecules, 49(15), 5527-5537.
  76. *Yu, K., Shi, Q., Dunn, M.L., Wang, T., Qi, H.J., 2016. Carbon fiber reinforced thermoset composite with near 100% recyclability. Advanced Functional Materials, 26(33), 6098-6106.
  77. *Zhao, Z., Mu, X., Wu, J., Qi, H.J., Fang, D., 2016. Effects of oxygen on interfacial strength of incremental forming of materials by photopolymerization. Extreme Mechanics Letter, 9, 108-118.
  78. *Yu, K., Shi, Q., Wang, T., Dunn, M.L., and Qi, H.J., 2016. A Computational Model for Surface Welding in Covalent Adaptable Networks using Finite Element Analysis, Journal of Applied Mechanics, 83, 091002-1. DOI: 10.1115/1.4033
  79. *Yu, K., Shi, Q., Li, H., Jabour, J., Yang, H., Dunn, M.L., Wang, T., and Qi, H.J., 2016. Interfacial Welding of Dynamic Covalent Network Polymers, Journal of Mechanics and Physics of Solids, 94, 1-17.
  80. *Mao, Y., Ding, Z., Yuan, C., Ai, S., Isakov, M., Wu, J., Wang, T., Dunn, M.L., Qi, H.J., 2016. 3D Printed Reversible Shape Changing Component with Stimuli Responsive Materials. Scientific Reports. 6:24761. DOI: 10.1038/srep24761
  81. *Wu, J., Yuan, C., Ding, Z., Isakov, M., Mao, Y., Wang, T., Dunn, M.L., Qi, H.J., 2016. Multi-shape active composites by 3D printing of digital shape memory polymers. Scientific Reports. 6:24224. DOI: 10.1038/srep24224
  82. *Yu, K., Li, H., McClung, A.J.W., Tandon, G.P., Baur, J., Qi, H.J., 2016. Cyclic Behaviors of Amorphous Shape Memory Polymers. Soft Matter, 12(13), 3234-3245.
  83. *Yang, H., Yu, K., Wei, Y., Guo, Y., Qi, H.J., 2016. Molecular Dynamics Studying on Welding Behavior in Thermoset Polymers due to Bond Exchange Reactions. RSC Advances, 6, 22476–22487.
  84. Taynton, P., Ni, H., Zhu, C., Yu, K., Loob, S., Jin, Y., Qi, H.J., and Zhang, W., 2016. Repairable Woven Carbon Fiber Composites with Full Recyclability Enabled by Malleable Polyimine Networks, Advanced Materials, 28(15), 2904-2909.


    2015

  85. *Mao, Y., Robertson, J.M., Mu, X., Mather, P., Qi, H.J., 2015, Thermoviscoplastic behaviors of anisotropic shape memory elastomeric composites for cold programmed non-affine shape change, Journal of Mechanics and Physics of Solids, 85:219-244.
  86. *Mao, Y., Yu, K., Isakov, M., Wu, J., Dunn, M.L., and Qi, H.J., 2015. Sequential Self-Folding Structures by 3D Printed Digital Shape Memory Polymers, Scientific Reports, 5:13616. doi:10.1038/srep13616
  87. Maute, K., *Tkachuk, A., Wu, J., Qi, H.J., Ding, Z., Dunn, M., 2015. Level Set Topology Optimization of Printed Active Composites, Journal of Mechanical Design, 137:111074.
  88. *Yu, K., Dunn, M.L., Qi, H.J., 2015. Digital Manufacture of Shape Changing Components, Extreme Mechanics Letter, 4: 9-17.
  89. *Yang, H., Yu, K., Mu X., Shi, X., Wei, Y., Guo, Y. Qi, H.J., 2015. A molecular dynamics study of bond exchange reactions in covalent adaptable networks. Soft Matter, 11, 6305-6317.
  90. *Robertson, J.M., Torbati, A.H., Rodriguez, E.D, Mao, Y., Baker, R.M., Qi, H.J., Mather, P.T., 2015. Mechanically Programmed Shape Change in Laminated Elastomeric Composites, Soft Matter, 11, 5754-5764.
  91. *Zhao, Z., Mu, X., Sowan, N., Bowman, C.N., Pei, Y., Qi, H.J., and Fang, D., 2015. Effects of Oxygen to the Light Activation in Covalent Adaptable Network Polymers, Soft Matter, 11, 6134-6144.
  92. Steinmetz, N. J., Aisenbrey, E.A., Westbrook, K.K., Qi, H.J., Bryant, S. J., 2015. Mechanical Loading Regulates Human MSC Differentiation in a Multilayer Hydrogel for Osteochondral Tissue Engineering, Acta Biomaterialia, 21:142-153.
  93. Yu, K., Philips, D.M., Baur, J.W., Qi, H.J., 2015. Analysis of Shape Memory Polymer Composites with Embedded Microvascular System for Fast Thermal Response, Journal of Composite Materials, v49, n15:1881-1893.
  94. *Zhao, Q., Qi, H.J., Xie, T., 2015. Recent Progress in Shape Memory Polymer: New Behaviors, Enabling Materials, and Mechanistic Understanding, Progress in Polymer Science, 49-50:79-120.
  95. *Yin, H., Qi, H.J., Fan, F., Zhu, T., Wang, B., Wei, Y., 2015. On the Griffith criterion for brittle fracture in graphene, Nano Letter, 15(3), 1918-1924.
  96. *Mu, X., Sowan, N., Tumbic, J.A., Bowman, C.N., Mather, P.T., Qi, H.J., 2015. Photo-Induced Bending in a Light-Activated Polymer Laminated Composite, Soft Matter, 11(13), 2673-2682.
  97. *Yu, K., Ritchie, A., Mao, Y., Dunn, M.L., Qi, H.J., 2015. Controlled Sequential Shape Changing Components by 3D Printing of Shape Memory Polymer Multimaterials, Procedia IUTAM, 12, 193-203.


    2014

  98. *Yu, K., Qi, H., 2014, Temperature Memory Effect in Amorphous Shape Memory Polymers, Soft Matter, 10(47), 9423-9432.
  99. *Yu, K., Taynton, P., Zhang, W., Dunn, M.L., Qi, H.J., 2014. Influence of Stoichiometry on the Glass Transition and Bond Exchange Reactions in Epoxy Thermoset Polymers, RSC Adv., 4(89), 48682-48690.
  100. *Yu, K., Ge, Q., Qi, H.J., 2014. Effects of stretch induced softening on the free recovery behavior of shape memory polymer composites, Polymer, 55(23), 5938-5947.
  101. *Yang, W.G., Lu, H., Huang, W.M., Qi, H.J, Wu, X.L., Sun, K.Y., Advanced Shape Memory Technology to Reshape Product Design, Manufacturing and Recycling. Polymers 6 (8), 2287-2308.
  102. Ge, Q., Dunn, C., Qi, H.J., Dunn, M.L., 2014. Active Origami by 4D Printing, Smart Materials and Structures, 23, 094007-15. (Selected as Highlights of 2014)
  103. Ma, J., Mu, X., Bowman, C.N., Sun, Y., Dunn, M.L., Qi, H.J., Fang, D.N., 2014. A Photoviscoplastic Model for Photo Activated Covalent Adaptive Networks. Journal of Mechanics and Physics of Solids, 70, 84-103.
  104. Taynton, P., Yu, K., Shoemaker, R., Jin, Y., Qi, H.J., Zhang, W., 2014. Heat or water driven self-healing in a highly-recyclable covalent network polymer, Advanced Materials, v26, 23:3938-3942.
  105. Hall, R.B., Rao, I.J., Qi, H.J., 2014. Thermodynamics and Thermal Decomposition for Shape Memory Effects with Crystallization Based on Dissipation and Logarithmic Strain. Mechanics of Time Dependent Materials, 18(2), 437-452.
  106. Yu, K., Taynton, P., Zhang, W., Dunn, M.L., Qi, H.J., 2014, Reprocessing and Recycling of Thermosetting Polymers based on Bond Exchange Reactions, RSC Adv., 2014, 4 (20), 10108 – 10117.
  107. Ge, Q., Luo, X., Iversen, C.B., Mather, P.T., Dunn, M.L., Qi, H.J., 2014, A Finite Deformation Thermomechanical Constitutive Model for Triple Shape Polymeric Composites Based on Dual Thermal Transitions, International Journal of Solid and Structures, 51, 2777-2790.
  108. Yu, K., Ge, Q., Qi, H.J., 2014, Reduced Time as a Unified Parameter Determining Fixity and Free Recovery of Shape Memory Polymers, Nature Communication, 5:3066.
  109. Yu, K., McClung, A.J., Tandon, G.P., Baur, J.W., Qi, H.J., 2014, A Thermomechanical Constitutive Model for an Epoxy Based Shape Memory Polymer and its Parameter Identifications, Mechanics of Time-Dependent Materials, 18(2) 453-474.


    2013

  110. Ge, Q., Qi, H.J., Dunn, M.L., 2013, Active Materials by 4D Printing, Applied Physics Letter, 103, 131901. (Reported by National Public Radio)
  111. Long, R., Qi, H. J., Dunn, M.L., 2013, Thermodynamics and Mechanics of Photochemcially Reacting Polymers, Journal of Mechanics and Physics of Solids, 61: 2212-2239.
  112. Wang, X., Sliker, L.J., Qi, H.J., Rentschler, M.E., 2013. A Quasi-Static Model of Wheel-Tissue Interaction for Surgical Robotics, Medical Engineering & Physics, 35,9, 1368-1376.
  113. Ge, Q., Westbrook, K.K., Mather, P.T., Dunn, M.L., Qi, H.J., 2013. Thermomechanical Behavior of a Two-Way Shape Memory Composite Actuator, Smart Material and Structures, 22, 055009.
  114. Long, R., Qi, H. J., Dunn, M.L., 2013, Modeling the mechanics of covalently-adaptable polymer networks with temperature-dependent bond exchange reactions, Soft Matter, 9 (15), 4083 – 4096.
  115. Ge, Q., Yu, K., Dunn, M.L., Qi, H.J., 2013. Shape Memory Polymers: Mechanisms and Constitutive Models. J. Aerospace and Lightweight Structures, 3:1-53.
  116. Yu, K., Westbrook, K.K., Kao, P.H., Leng , J., Qi, H.J., 2013. Design Considerations for Shape Memory Polymer Composites with Magnetic Particles, Comp. Mat., 47:51-63.
  117. Ge, Q., Luo, X., Iversen, C.B., Mather, P., Dunn, M., Qi, H.J., 2013. Mechanisms of Triple-Shape Polymeric Composites Featuring Dual Thermal Transitions, Soft Matter, 9, 2212-2223.


    2012

  118. Ge, Q., Yu, K., Ding, Y., Qi, H.J., 2012. Prediction of Temperature Dependent Free Recovery Behaviors of Shape Memory Polymers, Soft Matter, 8, 11098–11105.
  119. Yu, K., Tao Xie, T., Leng, J., Ding,Y., Qi, H.J., 2012. Mechanisms of Multi-Shape Memory Effects and Associated Energy Release in Shape Memory Polymers, Soft Matter, v8, 5687 – 5695.
  120. Tian,L., Lammers, S.R., Kao, P.H., Albietz, J.A., Stenmark, K.R., Qi, H.J, Robin Shandas, R., Hunter, K.S., 2012. Impact of Residual Stretch and Remodeling on Collagen Engagement in Healthy and Pulmonary Hypertensive Calf Pulmonary Arteries at Physiological Pressures, Annals of Biomedical Engineering, 40: 1419-1433.
  121. Ryu, J., D’Ameto, M., Cui, X., Long, N., Qi, H.J., Dunn, M.L., 2012. Photo-Origami-Bending and folding polymers with light, Applied Physics Letter, 100, 161908. (Feature Story for May 10, 2012 at phys.org (http://phys.org/news/2012-05-origami.html; It is also featured as one of the APL’s 50th Anniversary Collection: Editor’s Picks of Most Recent Publications. )
  122. Ge, Q., Luo, X., Rodriguez, E.D., Zhang, X., Mather, P., Dunn, M.L., Qi, H.J., 2012, Thermo-mechanical Behaviors of Shape Memory Elastomer Composites, Journal of Mechanics and Physics of Solids, v60, 67-83.


    2011

  123. Westbrook, K.K., Kao, P.H., Castro, F., Ding, Y., Qi,H.J., 2011. A 3D Finite Deformation Constitutive Model for Amorphous Shape Memory Polymers: A Multi-Branch Modeling Approach for Nonequilibrium Relaxation Processes. Mechanics of Materials, v43: 853-869.
  124. Tian, L., Lammers, S.R., Kao, P.H., Albietz, J.A., Stenmark, K.R., Qi, H.J, Robin Shandas, R., Hunter, K.S., 2011 Linked opening angle and histological and mechanical aspects of the proximal pulmonary arteries of healthy and pulmonary hypertensive rats and calves, American J. Physiology-Heart and Circulatory Physiology, 301:(5) H1810-H1818.
  125. Wang, A., Hansen, C., Ge, Q., Maruf, S.H., Ahn, D.U., Qi, H.J., and Ding, Y., 2011, Programmable, Pattern-Memorizing Polymer Surface, Advanced Materials, 23:3669-3673.
  126. Westbrook, K.K., Patrick T. Mather, Vikas Parakh, Martin L. Dunn, Qi Ge, Brendan M. Lee, H. Jerry Qi, 2011, Two-Way Reversible Shape Memory Effects in a Free-Standing Polymer Composite, Smart Material and Structures, 20, 065010 (9 pages).
  127. Long, K.N., Dunn, M.L., Qi, H.J., 2011, Photo-Induced Deformation of Active Polymer Films: Single Spot Irradiation, J. Solids and Struc., v48: 2089-2101.
  128. Castro, F., Westbrook, K.K., Hermiller, J., Ahn, D.U., Ding, Y., Qi, H.J., 2011. Time and Temperature Dependent Recovery of Epoxy-Based Shape Memory Polymers, ASME Journal of Engineering Materials and Technology, v133, n 2, 021025 (9 pages).
  129. Kao, P.H., Lammers, S., Tian, L., Qi, H.J., Hunter, K., Stenmark, K.R., Shandas, R., 2011. A Microstructurally-Driven Model for Pulmonary Artery Tissue, ASME Journal of Biomechanical Engineering, 051002-1-12 (12 pages).


    2010

  130. Ding, Y., Qi, H.J, Alvine,K.J., Ro,H.W., Ahn, D.U, Lin-Gibson,S.,Douglas,J.F., Soles, C.L., 2010. Stability and Surface Topography Evolution in Nanoimprinted Polymer Patterns under a Thermal Gradient. Macromolecules, 43: 8191-8201.
  131. Hunter, K.S., Albietz, J.A, Lee, P.F., Lanning, C.J., Lammers, S.R., Hofmeister, S.H., Kao, P.H., Qi, H.J., Stenmark, K.R., Shandas, R., 2010. In-vivo measurement of proximal pulmonary artery elastic modulus in the neonatal calf model of pulmonary hypertension: development and ex vivo validation. Appl. Physiol., 108: 968-975.
  132. Long, K.N., Dunn, M.L., Scott, T.F., Turpin, L.P., Qi, H.J., 2010. Light-Induced Stress Relief to Improve Flaw Tolerance in Network Polymers, Journal of Applied Physics, 107, 053519.
  133. Long, K.N., Dunn, M.L., Qi, H.J., 2010. Mechanics of Soft Active Materials with Phases Evolution, International Journal of Plasticity, 26, 603–616.
  134. Westbrook, K., Castro, F., Long, K., Slifka, A., Qi, H.J., 2010.  Improved Testing System for Thermomechanical Experiments on Polymers Using Uniaxial Compression Equipment, Polymer Testing, 29, 503-512.
  135. Westbrook, K.K, Parakh, V., Mather, P.T., Wan, L. C., Dunn, M.L., H.J. Qi, 2010, Constitutive Modeling of Shape Memory Effects in Semicrystalline Polymers with Stretch Induced Crystallization. ASME Journal of Engineering Materials and Technology, 312:041010-1-9.
  136. Roy, S., Qi, H.J., Miao, F., 2010. Cell Crawling Assisted by Contractile Stress Induced Retraction. ASME Journal of Biomechanical Engineering, v132, 061005.
  137. Kao, P.H., Lammers, S., Hunter, K., Stenmark, K.R., Shandas, R., Qi, H.J., 2010, Constitutive Modeling of Anisotropic Finite Deformation Hyperelastic Behaviors of Soft Materials Reinforced by Tortuous Fibers. International Journal of Structural Changes in Solids, 2, 19-29.
  138. Roy, S., Qi, H.J., 2010. A Computational Biomimetic Study of Cell Crawling. Journal of Biomechanics and Modeling in Mechanobiology, 9: 573-581.
  139. Long, K.N., Dunn, M.L., Scott, T.F., Qi, H. J., 2010, Photo-Induced Creep of Network Polymers. International Journal of Structural Changes in Solids, 2, 41-52.
  140. Castro, F., Westbrook, K.K, Long, K.N., Shandas, R., Qi, H.J., 2010. Effects of Thermal Rates on the Thermomechanical Behaviors of Amorphous Shape Memory Polymers, Journal of Mechanics of Time Dependent Materials, 14:219-241.


    2009 and before

  141. Long, K. N., Scott, T. F., Qi, H. J., Bowman, C. N., and Dunn., M. L., 2009. Photomechanics of Light-Activated Polymers, Journal of Mechanics and Physics of Solids, 57:1103-1121.
  142. Lammers, S., Kao, P., Qi, H.J., Hunter, K., Lanning, C., Albietz, J., Hofmeister, S., Mecham, R., Stenmark, K.R., Shandas, R., 2008. Changes in the structure-function relationship of elastin and its impact on the proximal pulmonary arterial mechanics of hypertensive calves. Am J Physiol Heart Circ Physiol, 295(4):H1451-1459.
  143. Roy, S., Qi, H.J., 2008. Micro-mechanical Model for Elasticity of the Cell Physical Review E, 77, 061916. Also in July 1, 2008 issue of Virtual Journal of Biological Physics Research.
  144. Tan, W., Scott, D., Belchenko, D., Qi, H.J., Xiao, L., 2008. Development and Evaluation of Microdevices For Studying Anisotropic Biaxial Cyclic Stretch on Cells, Biomed Microdevices, 10(6), pp. 869-882.
  145. Nguyen, T.D., Qi, H.J., Castro, F., Long, K.N., 2008. A thermoviscoelastic model for amorphous shape memory polymers: Incorporating structural and stress relaxation, Journal of Mechanics and Physics of Solids, 56:2792-2814. (#4 most cited paper in JMPS since 2007 as of June, 2012)
  146. Qi, H.J., Nguyen, T.D., Castro, F., Yakacki, C., Shandas, R., 2008. Finite Deformation Thermo-Mechanical Behavior of Thermally Induced Shape Memory Polymers, Journal of Mechanics and Physics of Solids, 56:1730-1751. (#3 most cited paper in JMPS since 2007 as of June, 2012)
  147. Westbrook, K.K., Qi, H.J., 2008. Novel Actuator Designs Using Environmentally Responsive Hydrogels, Intelligent Material Sys. Struct., 19:597-607.
  148. Martino, C.F., Belchenko, D., Ferguson, V., Nielsen-Preiss, S., Qi, H.J., 2008, The Effects of Pulsed Electromagnetic Fields on the Cellular Activity of SaOS-2 Cells, Bioelectromagnetics, 29:125-132.
  149. Arslan, M., Boyce, M.C., Qi, H.J., and Ortiz, C., 2008. Constitutive Modeling of the Stress-Stretch Behavior of Two-Dimensional Triangulated Macromolecular Networks Containing Folded Domains. J. Applied Mechanics, 75:011020.
  150. Qi, H.J., Ortiz, C., Boyce, M.C., 2006. Mechanics of biomacromolecular networks containing folded domains. ASME Journal of Engineering Material and Technology, 128:509-518.
  151. Tai, K., Qi, H.J., Ortiz, C., 2005. Effect of mineral content on the nanoindentation properties and nanoscale deformation mechanisms of bovin tibial cortical bone. Materials Science: Materials in Medicine, 16:947-959.
  152. Bruet, B.J.F., Qi, H.J., Boyce, M.C., Panas, R., Tai, K., Ortiz, C., 2005. Nanoscale morphology and indentation of insividual nacre tablets from the gastropod mollusc Trochus Niloticus. Material Research. 20: 2400-2419.
  153. Qi, H.J., Boyce, M.C., 2005. Stress-strain behavior of thermoplastic polyurethanes, Mater., 36:817-839. (As of October 2010, this paper is top 10 cited paper in Mech. Mater. in the past five years)
  154. Qi, H.J., Boyce, M.C., 2004. Constitutive model for stretch-induced softening of stress strain behavior of elastomeric material, Journal of Mechanics and Physics of Solids, November, 52:2187-2205.
  155. Qi, H.J., Teo, K.B.K., Lau, K.K.S., Boyce, M.C., Milne, W.I., Robertson, J., Gleason, K.K., 2003. Determination of mechanical properties of carbon nanotubes and vertically aligned carbon nanotube forests using nanoindentation, Journal of Mechanics and Physics of Solids, 51:2213-2237.
  156. Qi, H.J., Joyce, K., Boyce, M.C., 2003. Relationship between durometer hardness and the stress-strain behavior of elastomeric and elastomeric-like materials, Rubber Chem. Tech., 76:419-435.
  157. Qi, H., Fang, D., Yao, Z., 2001. Analysis of electric boundary condition effects on crack propagation in piezoelectric ceramics, ACTA Mech. Sinica, 17:59-70.
  158. Fang, D., Qi, H., Yao, Z., 1998. Numerical analysis of crack propagation in piezoelectric ceramics. Fatigue, Frac. Eng. Mater. Struc. 21:1371-1380.
  159. Qi, H., Fang, D., Yao, Z., 1997. FEM analysis of electro-mechanical coupling effect of piezoelectric materials, Mater. Sci., 8:283-290.
  160. Fang, D., Qi, H., Liu, T., 1997. Optimization of micro structures to elastoplastic properties in fiber reinforced composite materials, Tsinghua Sci. Tech., 2:539-544.
  161. Yao, Z., Qi, H., Fu, M., Yao, J., 1997. A kind of super-parametric finite element for geometric nonlinear analysis of plates and shells, Tsinghua Sci. Tech., 2:707-712.
  162. Yao, Z., Qi, H., Fu, M., Yao, J., 1997. Geometric nonlinear finite element analysis of sandwich plates and shells, Chinese J. Compu. Mech., 14:173-176. (in Chinese)
  163. Fang, D., Qi, H., Tu, S., 1996. Elastic and plastic properties of metal-matrix composites: geometrical effects of particles, Comput Mater. Sci., 6:303-309.
  164. Fang, D., Qi, H., 1996. Numerical study of effective properties of particulate reinforced composite materials, ACTA Mechanica Sinica, 28:475-482. (in Chinese)