Dynamic photoelasticity methods have been used to study the substrate deformation in polyurethane rubber due to the impact of a 3 mm steel ball with a velocity of 50 m/s and at angles of 30° and 90 ° . The experimental set-up used a multiple-spark camera with an integral polariscope to visualize the dynamic stress field generated by the impact. The stress fields were photographed both in the plane of the impact as well as below it. The analysis of the data showed that the rate of propagation of the stress field was 198 m/s. A maximum strain rate of 2.86 x 103 m/s was determined after a small time following the impact which also coincided with the time of maximum indentation.
Get full access to this article
View all access options for this article.
References
1.
Hutchings, I.M. , R.E. Winter and J.E. Field. "Solid Particle Erosion of Metals: The Removal of Surface Materials by Spherical Projectiles," Proceedings Royal Society of London, 348 A:379-392 (1976).
2.
Narayan, J. "The Characterization of the Damage Introduced During Micro-Erosion of MgO Single Crystals;' Wear, 25:99-109 (1973).
3.
Rickerby, D.G. and N.H. Macmillan. "The Erosion of Aluminum by Solid Particle Impingement at Normal Incidence," Wear, 60:369-382 (1980).
4.
Ligon, J.B. "A Photomechanics Study of Wave Propagation," Ph.D. dissertation, Iowa State University, Ames, Iowa ( 1971).
5.
Naim, M. and S. Bahadur. "Effect of Microstructure and Mechanical Properties on the Erosion of 18 Ni (250) Maraging Steel," in Wear of Materials-1985 , K. C. Ludema, ed. New York: The American Society of Mechanical Engineers , pp. 586-594 (1985).
6.
Kolsky, H.Stress Waves in Solids. New York: Dover Publications, Inc. (1963).
7.
Durelli, A.J. and W.F. Riley. "Stress Distribution on the Boundary of a Circular Hole in a Large Plate During Passage of a Stress Pulse of Long Duration," Journal of Applied Mechanics, 28:245-251 (1961).
8.
Dally, J.W. and W.F. Riley.Experimental Stress Analysis. New York : McGraw-Hill Book Company (1978 ).
