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Studies in Dynamic Photoelasticity

1956; ASM International; Volume: 23; Issue: 1 Linguagem: Inglês

10.1115/1.4011217

1528-9036

M. M. Frocht, P. D. Flynn,

Material Properties and Failure Mechanisms

Abstract Equipment and techniques are described for obtaining dynamic photoelastic stress patterns from arbitrary lines in plane-stress systems by means of streak photography. Streak-type stress patterns of such lines were obtained which provide continuous records throughout the entire period of impact (of the order of milliseconds) at times of exposure of 2/3 microsec. This is thirty times faster than the time of exposure (20 microseconds) obtained by Tuzi and Nisida in 1935. Dynamic photoelastic stress patterns showing stress-wave propagation are given for a bar struck axially by a rigid mass, and these patterns show that a uniform state of stress was obtained. Theoretical stress patterns based on the Boussinesq solution are in essential agreement with the experimental results.