A combined moire´-Sagnac interferometry method was applied for in-plane and out-of- plane crack-tip surface deformation measurement. Based on 2-D and 3-D Jacobian derivative method (JDM), a stress intensity factor evaluation procedure is proposed. This procedure utilizes selected measured displacements around the crack-tip region as input nodal displacements to calculate the stress intensity factor and the results correlate well with the theoretical calculations. The extent of the 3-D crack-tip deformation zone is also discussed.
Issue Section:
Technical Papers
1.
Kang, B. S. J., Zhang, G. Z., Jenkins, M. G., Ferber, M., and Ifju, P., 1993, “Development of Moire-Interferometry for In-Situ Material Surface Deformation Measurement at High Temperature,” SEM Spring Conference on Experimental Mechanics, Dearborn, MI, pp. 964–976.
2.
Wang, F. X., Ifju, P., and Kang, B. S.-J., 1992, “High-Temperature Moire Interferometry Using Zero-Thickness Grating,” SEM Spring Conference on Experimental Mechanics, Las Vegas, NV, June 8–11, pp. 727–731.
3.
Kang, B. S.-J., Zhang, G. Z., Manohar, E., and Liu, P., 1994, “Creep Crack Growth of Inconel 718 Superalloy at Elevated Temperature Using Moire Interferometry,” Spring Conference on Experimental Mechanics, Baltimore, MD, June 6–8, pp. 904–912.
4.
Carpenter, W., Kang, B. S.-J., and Chang, K. M., 1997, “SAGBO Mechanism on High Temperature Cracking Behavior of Ni-base Superalloys,” TMS International Symposium on Superalloys, 718, 625, 706 and Various Derivatives, Pittsburgh, PA, June 15–18, pp. 679–688.
5.
Wang, F. X., and Kang, B. S.-J., 1992, “Moire Interferometry in Liquid Mediums,” SEM, Proc. VII International Congress on Experimental Mechanics, Las Vegas, NV, June 8–11, pp. 1711–1766.
6.
Barbero
, E. J.
, and Reddy
, J. N.
, 1990
, “The Jacobian Derivative Method for Three-Dimensional Fracture Mechanics
,” Comm. Appl. Numer. Methods
, 6
, pp. 507
–518
.7.
Post, D., Han, B., and Ifju, P., 1994, High Sensitivity Moire, Springer-Verlag.
8.
Asundi, A., Cheung, M. T., and Lee, C. S., 1989, “Moire Interferometry for Simultaneous Measurement of u, v, w,” Exp. Mech., pp. 258–260.
9.
Post, D., “Moire Interferometry,” 1993, Handbook on Experimental Mechanics, Second Edition, ed., A. S. Kobayashi, SEM, pp. 297–364.
10.
Sagnac
, G.
, 1913
, “L’ether lumineux demontre par l’effect du vent relatif dether dans un interferometre en rotation uniforme
,” Acad. Sci., Paris, C. R.
, 157
, pp. 708
–710
.11.
Eichmann
, G.
, Li
, Y.
, and Alfano
, R. R.
, 1986
, “Digital Optical Logic Using a Pulsed Sagnac Interferometer Switch
,” Opt. Eng. (Bellingham)
, 25
, pp. 91
–97
.12.
Huang
, A.
, 1994
, “Sagnac Fiber Logic Gates and Their Possible Applications: A System Perspective
,” Appl. Opt.
, 33
, pp. 6254
–6266
.13.
Anderson, S. M., 1995, “Measurement of Full-Field 3-Dimensional Surface Deformations Near a Crack-tip Using Combined Moire-Sagnac Interferometry,” MS thesis, Mechanical and Aerospace Engineering Department, West Virginia University, Morgantown, WV.
14.
Hellen
, T. K.
, 1975
, “On the Method of Virtual Crack Extension
,” Int. J. Numer. Methods Eng.
, 9
, pp. 187
–207
.15.
Parks
, D. M.
, 1974
, “A Stiffness Derivative Finite Element Technique for Determination of Elastic Crack-Tip Stress Intensity Factors.
” Int. J. Fract.
, 10
, pp. 487
–502
.16.
Barbero, E. J., 1995, “Computer Code for 2-D and 3-D Jacobian Derivative Method,” CFC Report, West Virginia University, Morgantown, WV.
17.
Tada, H., Paris, P. C., and Irwin, G. R., 1973, The Stress Analysis of Cracks—Handbook, Del Research Corp., p. 2.10.
18.
Yang
, W.
, and Freund
, L. G.
, 1985
, “Transverse Shear Effects for Through-Cracks in an Elastic Plate
,” Int. J. Solids Struct.
, 21
, pp. 977
–994
.19.
Nakamura
, T.
, and Parks
, D. M.
, 1988
, “Three-Dimensional Stress Field Near The Crack Front of Thin Elastic Plate
,” ASME J. Appl. Mech.
, 55
, pp. 805
–813
.20.
Rosakis
, A. J.
, and Ravi-Chander
, K.
, 1986
, “On Crack-Tip Stress State: An Experimental Evaluation of Three-Dimensional Effects
,” Int. J. Solids Struct.
, 22
, pp. 121
–134
.Copyright © 2001
by ASME
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