J. Phys. IV France
Volume 110, September 2003
Page(s) 123 - 127

J. Phys. IV France
110 (2003) 123
DOI: 10.1051/jp4:20020681

High strain rate response of epoxy in tensile and shear loading

A. Gilat1, R. K. Goldberg2 and G. D. Roberts1

1  The Ohio State University, Department of Mechanical Engineering, 206 W. 18$^{{\rm th}}$ Avenue, Columbus, OH 43210, U.S.A.
2  NASA Glenn Research Center, Cleveland, OH 44135, U.S.A.

Epoxy type E-862 has been tested in tension and shear over a wide range of strain rates from 10-4 to 700 s -1. Experiments at strain rates of up to 2 s -1 have been conducted with a hydraulic testing machine, and tests at strain rates above 300 s -1 have been conducted using the split Hopkinson bar technique. The results show that the epoxy is very sensitive to the rate of deformation. A stiffer material response (increase in modulus) is observed with increasing strain rate in both tension and shear loadings. The maximum stress also increases with increasing strain rate. The maximum shear stress at a strain rate of 700 s -1 is roughly twice the maximum stress at a strain rate of 10 -4 s -1. In the tensile tests a smaller increase in the maximum stress is observed. This, however, might be due to the existence of a hydrostatic stress component that causes a premature fracture of the specimens.

© EDP Sciences 2003