Sanford's recent generalization of the Westergaard method for analyzing the state of stress at the tip of a crack is used to study the effect of n on-singular stress fields on the caustics, or shadow patterns, produced in Node-I loaded birefringent specimens. Particular attention is given to the influence of the term corresponding to a constant stress component parallel to the crack. It is shown that significant errors in the determination of the stress-intensity factor KI from caustic data can occur if the non-singular stress terms are sufficiently large, but that, to first order, the constant-stress term has negligible effect on the determination of KI if it is computed by using the average of the transverse diameters of the double caustics.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
TAM R 436
1979-6006
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112172
Copyright and License Information
Copyright 1979 Board of Trustees of the University of Illinois
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.
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