Education

  • Ph.D., Northwestern University, 1987
  • M.S., Northwestern University, 1984
  • B.S., Jilin University, China, 1982

Research Areas and Descriptors

Mechanics of Materials and Acoustics and Dynamics

  • Micromechanics; Fracture mechanics; Reliability of microelectronics packaging; Wave propagation and nondestructive evaluation.

Background

Dr. Qu began at Tech in 1989 as an Assistant Professor and in 2009 resigned to become Chair of Department of Civil & Environmental Engineering at Northwestern University. 

Research

Dr. Qu's research focuses on three areas of applied mechanics and mechanics of materials. In the area of thermomechanical reliability, Dr. Qu has conducted several research projects sponsored by the Defense Advanced Research Projects Agency, Airforce Research Laboratory, Motorola, Ford Motor Company, MCM-D Consortium, and the National Science Foundation Packaging Research Center at Georgia Tech. The objective of these projects is to identify the critical thermomechanical issues concerning the reliability of microelectronic devices, including potential mechanical failure mechanisms and modes, and their relationships with constituent material properties. Predictive models to estimate the reliability and durability of electronic devices used in various applications are being developed. In addition, material behaviors at the microscale are being characterized experimentally using several innovative microtest systems including an Eudora Microtester, a laser moire interferometer, and a microDAC system. The ultimate goal of this research is to develop a virtual reliability test tool to replace the physical reliability tests that are currently used by the industry.

In the area of quantitative ultrasonic nondestructive evaluation, Dr. Qu has been conducting research on using linear and nonlinear ultrasound to evaluate and characterize damage in structural materials. In this research, nondestructive evaluation is integrated into a life-prediction framework based on micromechanics analyses of material degradation, damage, and failure. Sponsors of this work include the National Science Foundation, the Office of Naval Research, the National Aeronautics and Space Administration and General Electric Power Systems. Future work in this area will focus on developing theories and techniques to identify and correlate nonlinear parameters to material property degradation.

The third area of Dr. Qu's research focuses on micromechanics of composite materials. The objective is to develop processing-microstructure-property relationships for advanced engineering composite materials based on micromechanics analysis. Current work in this area includes the effects of fiber distribution on damage initiation, modeling of layered matrix composites, nano-fiber reinforced composites, and 3-D interface fracture mechanics in anisotropic bimaterials. This research has been sponsored by the National Science Foundation. In the future, this work will focus on developing micromechanics theories and characterization techniques for composites with nano-size reinforcement particles or fibers.

Graduate students in Dr. Qu's research group have opportunities to conduct either theoretical, or numerical or experimental research, or a combination of these. Many of Dr. Qu's research projects are sponsored by the industry. Students working on these projects have opportunities to visit industries and to conduct industry summer internships.


 

Distinctions

  • Georgia Institute of Technology University Leadership Program Participant, 2008-2009
  • IEEE Components, Packaging, & Manufacturing Technology (CPMT) Society Outstanding Sustained Technical Contribution Award, 2008
  • American Society of Mechanical Engineers
    • Electronics and Photonics Division Outstanding Contributions in Mechanics Award, 2006
    • Fellow, 2001
    • Dynamic Response of Materials Committee Chair, 2000-present
  • Sigma Xi (Georgia Tech Chapter)
    • Best Paper Award (with Larry Jacobs), 2007
    • Best M.S. Thesis Award (Co-Advisor to Thomas Meuer), 2001
    • Best Ph.D. Thesis Award (Co-Advisor to Christine Valle), 2000
    • Young Faculty Award, 1994
  • 7th and 8th International Symposium on Advanced packing Materials Technical Chair, 2002 and 2001
  • Institution of Mechanical Engineers (UK) Water Arbitration Prize (for paper authored with Y. Berthelot and L. Jacobs), 2000
  • Woodruff School Faculty Fellow, 1997-2002
  • Society of Automotive Engineers Ralph R. Teetor Education Award, 1996
  • American Society for Engineering Education Dow Outstanding Young Faculty Award, 1993
  • Lilly Foundation Teaching Fellow, 1992
  • Georgia Institute of Technology/Amoco Foundation Junior Faculty Teaching Excellence Award, 1992

Representative Publications

  • R. Dingreville, J. Qu, and M. Cherkaoui, M. 2005. Surface Free Energy and Its Effect on the Elastic Behavior of Nano-Sized Particles, Wires and Films. Journal of Mechanics and Physical Solids 53, 18271854.
  • L. Capolungo, et al. 2005. Homogenization Method for Strength and Inelastic Behavior of Nanocrystalline Materials. International Journal of Plasticity 21, 67-82.
  • H. Y. Lee and J. Qu. 2004. Dimple-Type Failures in a Polymer/Roughened Metal System. Journal of Adhesion Science and Technology 18(10), 1153-1172.
  • J. Qu and L. Jacobs. 2004. Cylindrical Waves and Their Applications in Ultrasonic Evaluation. In Ultrasonic NDE for Engineering and Biological Material Characterization, T. Kundu (Ed.). CRC Press, New York, 311362.
  • J. Qu. 2003. Thermomechanical Reliability of Microelectronic Packaging. In Comprehensive Structure Integrity — Fracture of Materials from Nano to Macro, W. Gerberich and W. Yang (Eds.). Elsevier Science, 219-240.