Photoelastic studies of the two-dimensional dynamic stress-optic law
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Studies of the two-dimensional dynamic stress-optic law were made using Castolite circular disks under diametral impact load. The dynamic stress-fringe relationship of Castolite was found to be approximately linear. The dynamic fringe values were slightly lower than the static values. In four of the five specimens used the maximum difference was 8.2 percent. Previous work on the dynamic stress-optic calibration was limited to cases of one-dimensional stress.
A new dual-beam cathode ray oscilloscope and two dualtrace plug-in preamplifiers were adapted for this work. Taking advantage of symmetry, three strain components at an arbitrary point in the disk and the birefringence at the symmetrical point were recorded in one photograph during a single impact.
KeywordsMechanical Engineer Fluid Dynamics Maximum Difference Arbitrary Point Impact Load
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- 1.Flynn, P. D., “Studies in Dynamic Photoelasticity,”Ph.D. thesis, Illinois Institute of Technology, Chicago, Illinois, 1954.Google Scholar
- 2.Frocht, M. M., Flynn, P. D., and Landsberg, D., “A Photoelastic Study of Dynamic Stresses In Structures,” Final report to the U. S. Navy Bureau of Yards and Docks, Contract No. NOY-28149, 1954.Google Scholar
- 3.Betser, A. A., Flynn, P. D., and Frocht, M. M., “On the Stress-Optic Law Under Impact Loading,” Proceedings of the Ninth International Congress On Theoretical and Applied Mechanics, University of Brussels, 1957, pp. 367–377.Google Scholar
- 4.Frocht, M. M., “Further Studies In Dynamic Photoelasticity With Special Emphasis On The Stress-Optic Law,” Paper presented at the International Symposium on Stress Wave Propagation in Metals, held at Pennsylvania State University, June 29–July 3, 1959.Google Scholar
- 5.Clark, A. B. J., “Static and Dynamic Calibration of a Photoelastic Model Material CR-39,”Proceedings of SESA, 14, No. 1, 195–204 (1956).Google Scholar
- 8.Durelli, A. J., andRiley, W. F., “Experiments on Transient Two-Dimensional Stress-Strain Distributions,”Jnl. Appl. Mech., 24, No. 1;Trans. ASME, 79, 69–76 (1957).Google Scholar
- 9.Dally, J. W., Riley, W. F., andDurelli, A. J., “A Photoelastic Approach to Transient Stress Problems Employing Low-Modulus Materials,”,26, No. 4;Ibid. Trans. ASME, 81, 613–634 (1959).Google Scholar
- 10.Frocht, M. M., andPih, H., “A New Cementable Material for Two- and Three-Dimensional Photoelastic Research,”Proceedings of SESA, 12, No. 1, 55–64 (1954).Google Scholar