Weili Cheng, Ph.D.
Senior Mechanical Engineer
Contact Information
e-mail: Weili@bearinc.com
phone: (510) 549-3300
Curriculum Vitae
Education
Ph.D. University of California, Berkeley, Dept. of Mech. Eng., May 1984
Thesis: Analytical solutions for the stress intensity factors due to a
circumferential crack subjected to an arbitrary stress distribution
and an experimental method for measurement of residual axial stresses in
a thin-walled cylinder.
M.S. University of California, Berkeley, Dept. of Mech. Eng., June, 1981
B.S. Northwest Light Industry Institute, Shaanxi China, Aug. 1976
Research Experience
Assistant Research Engineer, Engineering College, U.C., Berkeley
~1988-1992~
Developed a new method for residual stress measurement based on solutions from fracture mechanics. This work which was carried out
under EPRI sponsorship was initially focused on nuclear reactor pressure vessel components. However, it has since found wide applications
for other types of components. Developed a model to predict the strength of glass due to subsurface flaws. This project was sponsored by
NSF.
Research Associate, Dept. of Mech. Eng. U.C., Berkeley
~1987-1988~
Developed a computational model for the failure analysis of a pressure vessel due to both internal pressure and thermal stresses; analytical
and experimental studies of brittle/ductile transitions in brittle solids.
Postdoctoral research, Lawrence Berkeley Laboratory, Berkeley
~1984-1985~
Analysis of micro-cracking in brittle materials due to scribing.
Predoctoral graduate training, Dept. of Mech. Eng. U.C., Berkeley
~1981-1984
Solid mechanics, plasticity, fracture mechanics, science of engineering materials, mechanical design, manufacture processes, kinematics
and dynamics of mechanisms, machine design, automatic control, numerical analysis and the finite element method.
Research Assistant, Dept. of Mech. Eng. U.C., Berkeley
~1982-1983~
Conducted experiments to determine the stress intensity factors by using the method of electrical analogy.
Research Assistant, Dept. of Mech. Eng., Northwest Light Industry Institute, Shaanxi, China
~1975-1976~
Designed and implemented the electrical control system for the first automatic spindle drilling machine in China, which was awarded by the
Chinese Light Industry Ministry in 1978.
Other Professional Experience
Various failure analyses and numerical computations
~1988-1992~
- Prediction of ductile fracture initiation in an experimental pressure vessel
- Development of a model to predict stress concentration in a longitudinal welded pipe under creep conditions
- Prediction of the influence of residual stresses due to shot peening on both the detection of fatigue cracks and their propagation
in a DC-10 titanium compressor disk
- Calculation of effect of creep on burst pressure of piping at elevated temperature
Assistant Professor, Dept. of Eng. Mechanics, Shanghai Jiao Tong
~1986-1987~
University, Shanghai, China. Class: Strength of Materials; Colloquium - Current research and teaching activities in engineering colleges in
U.S.A. Tour lecture: the Compliance Method for residual stress measurement, Northwest Polytech. Institute, Xian, China. Compute system
management: established communication between DEC-VAX and IBM PC; produced a supervising software for system management on a
DEC-VAX.
Teaching Assistant, Dept. of Mech. Eng. University of California, Berkeley
~1983-1984~
Class: Fracture Mechanics
Assistant Lecturer for undergraduates, Dept. of Mech. Eng. Northwest Light Industry Institute, Shaanxi, China
~1977-1978~
Class: Machine Design
Fellowships and Awards
1979 - National Fellowship for outstanding graduate students, China
1975 - Honor Student Award, Northwest Light Industry Institute, China
Special Skills
- Computer programming: Basic, C, C++, and Fortran
- Spreadsheet: Lotus-123 and Quattro-Pro
- Database: Paradox
- Mathematics: Derive and Maple
- Finite element analysis: Cosmos, Nike2d, and Topaz
- Familiar with VAX/VMS, UNIX, CRAY, Apple Macintosh, and IBM PC systems
Publications
"Prediction of the Stress Intensity Factor for an Internal Circumferential Crack at a Butt-Weld Between Cylinders Using Plane Strain Solutions," with G. Stevick, et al, ASME J. of Eng. Mat. and Tech., 106, pp. 21-24 (1984).
"On the Prediction of Stress Intensity Factors for Axisymmetric Cracks in Thin-Walled Cylinders From Plane Strain Solutions," with I. Finnie, ASME J. of Eng. Mat. and Tech., 106, pp. 227-231 (1985).
"A Method for Measurement of Axisymmetric Residual Stresses in Circumferentially Welded Thin-Walled Cylinders," with I. Finnie, ASME, J. of Eng. Mat. and Tech., 106, pp. 181-185 (1985).
"Examination of the Computational Model for the Layer-Removal Method for Residual-Stress Measurement," with I. Finnie, SEM Experimental Mechanics, 26, pp. 150-152 (1986).
"Measurement of Residual Hoop Stresses in Cylinders Using the Compliance Method," with I. Finnie, ASME J. of Eng. Mat. and Tech., 108, pp. 87-92 (1986).
"Determination of Stress Intensity Factors for Partial Penetration Axial Cracks in Thin-Walled Cylinders," with I. Finnie, ASME J. of Eng. Mat. and Tech., 108, pp. 83-86 (1986).
"A New Method for Measurement of Residual Axial Stresses Applied to a Multi-Pass Butt-Welded Cylinder," with I. Finnie, ASME J. of Eng. Mat .and Tech., 109, pp. 337-342 (1987).
"KI Solution for an Edge-Cracked Strip," with I. Finnie, Eng. Fracture Mechanics, 31, pp. 201-207 (1988).
"Stress Intensity Factors for Radial Cracks in Cylinders and Other Simply Closed Bodies," with I. Finnie, Eng. Fracture Mechanics, 32, pp. 767-774 (1989).
"A Mechanism for Subsurface Median Crack Initiation in Glass During Indenting and Scribing," with I. Finnie, J. of Mat. Sci., 25, pp. 575-579 (1990).
"KII Solutions for an Edge-Cracked Strip," with I. Finnie, Eng. Fracture Mechanics, 36, pp. 355-360 (1990).
"Median Cracking of Brittle Solids due to Scribing With Sharp Indenters," with E. Ling, et al, Journal of Am. Ceramic Soc., 73, pp. 580-86 (1990).
"The Crack Compliance Method for Residual Stress Measurement," with I. Finnie, Welding in the World, 28, pp. 103-110 (1990).
"Delayed Crack Propagation in a Steel Pressure Vessel Due to Thermal Stresses," with I. Finnie and K. J. McCorkindale, Int. J. Pres. &Piping, 42, pp. 15-31 (1990).
"Measurement of Residual Stresses Near the Surface Using the Crack Compliance Method," with Ö. Vardar, et al, ASME J. of Eng. Mat. and Tech., 113, pp. 199-204 (1990).
"An Experimental Method for Determining Residual Stresses in Welds," With I. Finnie, In Modeling of Casting, Welding and Advanced Solidification Processes - V, (M. Rappaz ed.), The Minerals Metals and Materials Soc. Warrendale, PA, USA (1991).
"Deformation of an Edge-Cracked Strip Subjected to Normal Surface Traction on the Crack Faces," with Ö. Vardar, et al, Eng. Fracture Mechanics, 42, pp. 97-108, 1992.
"Estimation of Axisymmetric Residual Stresses in a Long Cylinder," with I. Finnie, et al, ASME J. of Eng. Mat. Tech., 114, pp. 137-140, 1992.
"Measurement of Residual Stresses Through the Thickness of a Strip Using the Crack-Compliance Method," with M. Prime, et al, Residual Stresses - III Science and Technology Vol. 2, Edited by H. Fujiwara, T. Abe and K. Tanaka, Elsevier Science Publishers, London and New York, pp. 1127-1132, 1992.
"Deformation of an Edge-cracked Strip Subjected to Arbitrary Shear Surface Traction on the Crack Faces", with I. Finnie, Eng. Fracture Mechanics, 43, pp. 33-40, 1992.
"Measurement of Residual Stress Distributions near the Toe of a Weld Between a Bracket and a Plate Using the Crack Compliance Method," with I. Finnie, Proc. of IUTAM Symposium, Mechanical Effects of Welding, Edited by L. Karisson, L. Lindgren and M. Jonsson, Springer-Verlag Berlin Heidelberg, 135-141, 1992.
"Measurement of Residual Stresses in Laser Treated Layers Using the Crack Compliance Method," with M. Gremaud, et al, Proc. of Int. Conf. on Laser Advanced Materials Processing, Edited by Matsunawa and Katayama, 713-718, 1992.
"A Prediction of the Strength of Glass Following the Formation of Sub-Surface Flaws by Scribing," with I. Finnie, Journal of Am. Ceramic Soc., 75, pp. 2565-72 (1992).
"A Comparison of the Strains due to Edge Cracks and Cuts of Finite Width With Applications to Residual Stress Measurement", with I. Finnie, ASME J. of Eng. Mat. and Tech., 115, 220-226, 1993.
"Measurement of Residual Stress Distributions Near the Toe of an Attachment Welded on a Plate Using the Crack Compliance Method ", with I. Finnie, Eng. Fracture Mech., 46, 79-92, 1993.
"Measurement of Near Surface Residual Stress Using Electric Discharge Wire Machining," with M. Gremaud and et al, ASME J. of Eng. Mat. and Tech., 116, 1-7,1994.
"The Compliance Method for Measurement of Near Surface Residual Stresses - Analytical Background," with M. Gremaud and et al in ASME J. of Eng. Mat. and Tech., 116, pp. 550-555, 1994.
"The Compliance Method for Measurement of Near Surface Residual Stresses - Application and Validation for Surface Treatment by Laser and Shot-Peening," with I. Finnie and et al, ASME J. of Eng. Mat. and Tech. 116, pp. 556-560, 1994.
"Measurement of Residual Stress Distribution in a Disk or Solid Cylinder Using the Crack Compliance Technique," with H. J. Schindler, et al, Fourth International Conference on Residual Stresses, Baltimore, June, 1994.
"An Overview of the Crack Compliance Method for Residual Stress Measurement," presented at the Fourth International Conference on Residual Stresses, with I. Finnie, Proceedings of the Fourth International Conference on Residual Stresses, Baltimore, pp. 449-458, 1994.
Residual Stresses and Fracture Mechanics, with I. Finnie, ASME J. of Eng. Mat. and Tech. 117 pp. 373-378, 1995.
Analysis of the Fluid-Elastic Vibration of a U-Bend Tube Bundle Induced by Cross-Flow in PWR Steam Generators, with I. Finnie, Nuclear Engineering and Design, 160 pp. 111-128, 1996.
Stress Analysis and Fatigue Life Prediction for a U-Bend Steam Generator tube, with I. Finnie, Nuclear Engineering and Design, 165, 101-109, 1996.
The Computation and Measurement of Residual Stresses in Laser Deposited Layers, with M. Gremand etal, published in Journal de Physique, France, 1996.
Computation of Stress Intensity Factors for a 2-D body from Displacements at an Arbitrary Location, with I. Finnie, Int. J. of Fracture, 81, 259-267,1996.
Residual Stress Measurement by the Introduction of Slots or Cracks, with I. Finnie, ALocalized Damage IV, eds Nisitani et al. Computation Mechanics Publications, 37-51, 1996.
Computation of Stress Intensity Factors for Three-Dimensional Bodies Using Crack-Displacements, with I. Finnie, Int. J. of Fracture, 83, 91-104, 1997.
Experimental Determination of Stress Intensity Factors Due to Residual Stresses, with H. J. Schindler, et al., Experimental Mechanics, 37, 272-277, 1997.
Cheng, W. and Finnie, I. (1998) The Single-Slice Method for Measurement of Axisymmetric Residual Stresses in Solid Rods or Hollow Cylinders in the Region of Plane Strain, ASME J. of Eng. Mat. and Tech. 120, 170-176.
Cheng, W. (1999) Determination of the Mode I Stress Intensity Factors for an Edge-Cracked Beam with Fixed Ends, Eng. Fracture Mech. 63, 193-208.
Cheng, W. (2000) Measurement of the Axial Residual Stresses Using the Initial Strain Approach, ASME J. of Eng. Mat. and Tech., 122, 135-140.