Complex Stress Intensity Factors in Bent Plates With Cracks

[+] Author and Article Information
P. S. Theocaris

Department of Theoretical and Applied Mechanics, The National Technical University of Athens, 5, K. Zographou Street, Zographou, Athens 624, Greece

J. Appl. Mech 49(1), 87-96 (Mar 01, 1982) (10 pages) doi:10.1115/1.3162076 History: Received June 01, 1981; Revised September 01, 1981; Online July 21, 2009


The experimental method of caustics was applied to the study of asymmetric bending of isotropic cracked plates and to the determination of the complex stress intensity factors (S.I.F’s) at the crack tips. It was shown that the method of reflected caustics is convenient for detecting and evaluating both KI and KII stress intensity factors. Based on the singular approximation of the elastic solution around the crack tip, the theory of formation of the caustics was developed and related to the evaluation of both components of stress intensity factors. It was also shown that the generalized method of caustics, known as the method of pseudocaustics, is a potential and simple method for determining S.I.F’s in cracked plates submitted to bending. Experimental evidence with specimens made either of optically inert materials, such as plexiglass, or of any opaque material like steel, and elastically loaded, has corroborated the theoretical results.

Copyright © 1982 by ASME
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