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RESEARCH PAPERS

Optical Stress Analysis of Flexural Waves in a Bar

[+] Author and Article Information
J. A. Clark, A. J. Durelli

Department of Civil Engineering and Mechanics, The Catholic University of America, Washington, D. C.

J. Appl. Mech 37(2), 331-338 (Jun 01, 1970) (8 pages) doi:10.1115/1.3408510 History: Received May 28, 1969; Revised September 13, 1969; Online April 06, 2010

Abstract

A complete, direct, full-field optical determination of dynamic stress distributions by a combination of photoelastic and interferometric measurements is illustrated. The method is applied to the study of flexural waves propagating in a photoelastic, urethane rubber bar. A displacement type of transverse, dynamic loading (which has approximately the form of a decaying sine wave) is applied at one end of the bar. The loading pulse can be repeated with good precision. Individual isochromatics and isoclinics are obtained, using a still camera with a short duration (0.5 micro sec) flash. A series of isochromatics have also been obtained with a Fastax high-speed motion picture camera. Photoelastic data are supplemented by isopachic patterns obtained by a modified method of holographic interferometry recently developed by the authors. As an example of complete determination of stress distributions, a vectorial representation of the principal stresses at one instant is given. Comparisons are made with approximate theories.

Copyright © 1970 by ASME
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