An Exploratory Study of Three-Dimensional Photothermoelasticity

[+] Author and Article Information
Herbert Tramposch

Products Development Laboratory, International Business Machines Corporation, Poughkeepsie, N. Y.

George Gerard

College of Engineering, New York University, New York, N. Y.

J. Appl. Mech 28(1), 35-40 (Mar 01, 1961) (6 pages) doi:10.1115/1.3640464 History: Received February 15, 1960; Online September 16, 2011


A sandwich technique which utilizes an embedded polariscope consisting of two sheets of polarizing material cemented within a plastic model was evaluated for application to three-dimensional photothermoelasticity. The evaluation included strength tests of cemented joints, photoelastic tests of simple bending models and a sphere, all under mechanical loading. The technique proved to be rather simple to apply particularly since the resulting fringe patterns are readily interpreted. The sandwich technique was then applied to thermal-stress problems associated with a thick-walled cylinder under steady-state conditions. The experimental results correlated well with theory. The results obtained indicate the general applicability of the sandwich technique to three-dimensional stress problems generated by mechanical or thermal loads. It is noted that since other experimental thermal-stress-analysis methods are not highly developed, photothermoelasticity would seem to be particularly useful.

Copyright © 1961 by ASME
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