Engineering Center, Room 301
115 Library Drive
Rochester, MI 48309-4479
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Dean's Office: (248) 370-2217
Academic Advising: (248) 370-2201
SECSDean@oakland.edu

KLi

Keyu Li, Ph.D. Keyu Li, Ph.D.
Professor
Mechanical Engineering Department
414 EC; (248) 370-2862 ; Fax: (248) 370-4261
kli@oakland.edu

Ph.D., Johns Hopkins University, 1993 
  • M.S. and B.S., Tsinghua University, Beijing, P.R. China, 1988 and 1986
  • Associate Professor, Oakland University since 1999
  • Assistant Professor, Oakland University from 1995 to 1999
  • Assistant professor at Western Michigan University between 1993 and 1995
  • Global Register’s WHO’S WHO in Executives and Professionals, Recognizing Business Leaders Throughout the World, Invitee to the publication 2006-2007 for free, to be recorded in Washington D.C. at Library of Congress International Standard Book Number:0-9702264-3-B.
  • Foreign Expert, Certificate issued by State Administration of Foreign Experts Affairs, People’s Republic of China, 2004.
  • National Science Foundation Career Awardee, 1998
  • Alcoa Science Foundation Awardee, 1995 and 1996

RESEARCH

  • Optical Techniques for Measurements of Strains and Stresses
  • Smart Materials to Measure Permanent Deformations and Residual Stresses Induced from Manufacturing Processes
  • Material Evaluation and Characterization
  • FEM Modeling of Material Behavior and Structural Mechanics
  • FEM Simulation of Manufacturing Processes such as Quenching.
  • Noncontacting Methods for Dynamic and Vibration Measurement
  • Fatigue, Creep and Fracture Mechanics
  • Tribology Modeling
  • Our fundamental research has been sponsored by NSF for last ten years through several projects and it is in the stage of being used to solve challenging fundamental and applied problems. Our optical techniques have unique advantages over other techniques and can be used to solve problems beyond the reach of conventional methods, e.g, residual stress measurements.
Current Research Projects
  1. An experimental and analytical study of quenching process. Moterial models are installed into User's subroutine in ABAQUS. The FEM was used to simulate thermal stresses and residual stress during heat treatment and quenching process. Quenching experiments were conducted to determine heat transfer coefficients in various quenching conditions. Tensile tests were conducted to detremine material constants. Residual stresses were measured by using conventional method and optical methods developed in the lab.
  2. A quasi-nondestructive method for residual stress evaluation. Residual stresses cause structural failures in industrial manufacturing. They result in lost productivity, poor product reliability, and wasted labor and materials. This project aims to develop an innovative optical method for residual stress evaluation.
  3. Fatigue testing. An 55 kips MTS is available in the lab to test fatigue behavior of materials. Uniaxial and three point bending tests have been conducted to test strength of materials and fatigue life of materials. Load controlled and troke controlled and strain controlled tests can be performed to obtain S-N curves and strain-life curves.
  4. Vibratory Stress Relief. Residual stresses can be reduced or eliminated by vibration. The mechanism of the process will be investigated. The process parameters will be calibrated for commercial use in industries.
  5. A new interference optical strain rosette technique. An interferometric strain rosette technique is developed. The technique is based on laser interferometry and noncontacting in nature. The system is computer-controlled with an automated data acquisition and analysis system. The method has wide applications in the study of mechanical properties of materials and mechanics problems in industries. The FORTRAN language is currently used for test control and data acquisition. Future research involves developing new software using C or C++.
  6. Modeling and smart sensor for studying high temperature properties of aluminum materials. New smart sensor equipment will be developed to study high temperature behaviors of materials. The finite element method will be used to implement the experimental capability. Mechanical properties which will be studied using the equipment include fatigue, creep and fracture behaviors of aluminum materials.
  7. Development of a novel vibration measurement technique and its applications in vibration and acoustic problems A novel high speed laser system will be developed to measure vibrations in mechanical structures including beams, plates and shells.
Selected Publications


  • Li, K. and Ren, W., “Application of ring-core and optical rosettes to measure residual stresses distribution with depth-part I: theory”, ASME (American Society of Mechanical Engineering) Journal of Applied Mechanics, 2006, final paper proof reading as September issue, vol. 73., in press to be appear in March issue 2007.
  • Ren, W. and Li, K., “Application of ring-core and optical rosettes to measure residual stresses distribution with depth-part II: experiments” ASME Journal of Applied Mechanics, 2006, final paper proof reading as September issue, vol. 73, in press and to be appear in March issue, 2007.
  • Ren, W. and Li, K. and Feng, Z., “Ultrasonic welding stress distribution measured with optical rosette/ring-core method,” SAE (Society of Automotive Engineering ) 2005 Transactions Journal of Materials and Manufacturing, March 2006, paper # 2005-01-1035, pp.547-550.
  • Tjhung, T., and Li, K., “Measurement of in-plane residual stresses varying with depth by the interferometric strain/slope rosette and incremental hole-drilling”, ASME Journal of Engineering Materials and Technology, vol.125, April, 2003, pp.153-162.
  • Li, K., "Interferometric strain/slope rosette for static and dynamic measurements," SEM (International Society of Experimental Mechanics) Journal of Experimental Mechanics, Vol. 37, No. 2, June 1997, pp. 111-118.
  • Li, K., "Application of the interferometric strain rosette to residual stress measurements," (International Forum of Elsevier Science) Journal of Optics and Lasers in Engineering, Vol. 27, No. 1, 1997, pp.125-136.
  • Li, K., and W. N. Sharpe, Jr., "Viscoplastic behavior of a notch root at 650oC: ISDG measurement and finite element modeling," ASME Journal of Engineering Materials and Technology, Vol. 118, No. 1, 1996, pp. 88-93.
  • Li, K., "The interferometric smart material for measuring permanent deformations," ASNT (American Society for Nondestructive Testing) Materials Evaluation, Vol. 54, No. 4, April, 1996, pp. 561-567.
  • Li, K., "The interferometric strain rosette technique," SEM International Journal of Experimental Mechanics, Vol. 36, No. 3, September, 1996, pp. 199-203.
  • Li, K., "Out-of-plane displacement derivative measurements using interferometric strain/slope gage," ASME Journal of Applied Mechanics, Vol. 63, No. 4, December 1996, pp. 1033-1038.
  • Li, K., "Interferometric 45o and 60o strain rosettes," OSA Journal of Applied Optics, Vol. 34, No. 28, 1995, pp. 6376-6379.
  • Ren, W. and Li, K., “An optical strain rosette/ring-core method applied on laser weld,” conference proceedings of the 21st International congress of theoretical and applied mechanics, SM7 Experimental methods in solid mechanics, Aug. 15-21, 2004, Warsaw, Poland, CD-ram, SM7L_10492, Abstract proceeding, P. 247.
  • Li, K., 2000, “Residual stress measurement with optical strain rosettes,” Proceedings of the IUTAM (International Conference of Theoretical and Applied Mechanics) Symposium, Futuroscope, Poitiers, France, August 31 –September 4, 1998, entitled “IUTAM Symposium on Advanced Optical Methods and Applications in Solid Mechanics,” edited by Alexis Lagarde, Kluwer Academic Publishers, 2000, pp. 145-152.
  • Li, K., "Interferometric strain/slope rosette,” Abstract Proceedings of the 19th IUTAM International Congress of Theoretical and Applied Mechanics, Kyoto, Japan, August 25-31, 1996, page.604.
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