Photoelastic Studies of Dynamic Stresses in High Modulus Materials

Ultra-high-speed photography is needed to record transient stress patterns in models made from high modulus photoelastic materials. A unique photooptical system was developed to obtain simultaneous normal and oblique incidence dynamic stress patterns at rates up to 1,000,000 frames/s. Comparing the photoelastic results with strain gage measurements demonstrated the usefulness of the oblique incidence method for separating principal stresses under dynamic conditions in a circular disc. Dynamic values of the stress-optic coefficient, Young's modulus, and Poisson's ratio were determined from photoelastic and strain gage measurements of elastic waves in a bar. Examples of stress wave propagation in transparent, two-dimensional models were studied using these techniques.

Print ISSN

0361-4573

Published

1966-08

Content type

Original Research

DOI

10.5594/J15240