Education:

  • Sc.D., Massachusetts Institute of Technology, 2003
  • Ph.D.,Tsinghua University, China, 1999
  • B.S., Tsinghua University, China, 1994

Research Areas and Descriptors

Mechanics of Materials; Soft active materials; 3D printing technology; 3D printing of active materials and structures; Design of active materials and structures; Recyclable polymer systems; Experimental characterization and modeling of nonlinear thermoviscoelastic behaviors of polymers; Polymer physics and mechanics; Photo-mechanics of light activated polymers; Shape memory polymers; Nonlinear finite element analysis; Mechanics of soft tissue growth.

Background

Dr. Qi joined Tech in January 2014 as an associate professor. Prior, he was an associate professor at University of Colorado Boulder and was a postdoctoral fellow at MIT. He is currently seeking talented undergraduate and PhD students and postdocs.

Research

Dr. Qi’ research falls in the general area of finite deformation multiphsyics modeling of soft active materials. The material systems include: shape memory polymers, shape memory elastomeric composites, light activated polymers, covalent adaptive network polymers, arterial tissues. Particularly, he is interested in understanding and modeling the evolution of material structure and mechanical properties of these materials under environmental stimuli, such as temperature, light, etc, and during material processing, such as 3D printing. To assist understanding of mechanical properties, his group routinely conducts thermomechanical or photo-mechanical experiments. Constitutive models developments are typically based on the observations from these experiments. The ultimate goal of the constitutive models is to integrate them with finite element through user material subroutines so that these models can be used to solve complicated 3D multiphysics problems involving nonlinear mechanics.  

As examples of these research themes, his current research projects include 4D printing of active materials; mechanics in 3D printing technology; reprocessing and recycling thermosetting polymers; active polymer design and manufacturing. These projects are conducted through supports by NSF and AFOSR, and through collaborations with Singapore University of Technology and Design (SUTD), and Air Force Research Laboratories (AFRL).

 

  • J. T. Oden Faculty Fellowship, UT Austin, (2012)
  • AFRL summer faculty fellowship (2010-2012)
  • Mechanical Engineering Outstanding Research Award (2009)
  • Mechanical Engineering Chair Faculty Fellow (2008)
  • NSF Career Award (2007)
  • Woodward Outstanding Mechanical Engineering Faculty (2006-2007)
  • University of Colorado Graduate School Junior Faculty Development Award (2005)
  • Yu, K., Ge, Q., Qi, H.J., “Reduced Time as a Unified Parameter Determining Fixity and Free Recovery of Shape Memory Polymers”, Nature Communication, accepted.

  • Ge, Q., Qi, H.J., Dunn, M.L., 2013, Active Materials by 4D Printing, Applied Physics Letter, 103, 131901. (Reported by NPR, ABC, and many other medias)

  • 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.

  • Jennie Ryu, J., D’Ameto, M., Cui, X., Long,K.N., Qi, H.J., Dunn, M.L., 2012. Photo-Origami-Bending and folding polymers with light, Applied Physics Letter, 100, 161908.

  • 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, J. Mech. Phys. Solids., v60, 67-83.

  • 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.

  • 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.

  • 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).

  • Long, K. N., Scott, T. F., Qi, H. J., Bowman, C. N., and Dunn., M. L., 2009. Photomechanics of Light-Activated Polymers, J. Mech. Phys. Solids, 57:1103-1121.

  • T. D. Nguyen, H. J. Qi, F. Castro, K.N. Long, 2008. A thermoviscoelastic model for amorphous shape memory polymers: Incorporating structural and stress relaxation, J. Mech. Phys. Solids,56:2792-2814.

  • H.J. Qi, T.D. Nguyen, F. Castro, C. Yakacki, R. Shandas, 2008. Finite Deformation Thermo-Mechanical Behavior of Thermally Induced Shape Memory Polymers, J. Mech. Phys. Solids, 56:1730-1751.

  • H.J. Qi, M.C. Boyce, 2005. Stress-strain behavior of thermoplastic polyurethanes, Mech. Mater., 36:817-839.

  • H.J. Qi, M.C. Boyce, 2004. Constitutive model for stretch-induced softening of stress strain behavior of elastomeric material, J. Mech. Phys. Solids, November, 52:2187-2205.

  • H.J. Qi, K.B.K. Teo, K.K.S. Lau, M.C. Boyce, W.I. Milne, J. Robertson, K.K. Gleason, 2003. Determination of mechanical properties of carbon nanotubes and vertically aligned carbon nanotube forests using nanoindentation, J. Mech. Phys. Solids, 51:2213-2237.