ON THE APPLICATION OF THE OPTICAL METHOD OF CAUSTICS TO THE INVESTIGATION OF TRANSIENT ELASTODYNAMIC CRACK PROBLEMS - LIMITATIONS OF THE CLASSICAL INTERPRETATION

被引:17
作者
ROSAKIS, AJ
KRISHNASWAMY, S
TIPPUR, HV
机构
[1] Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena
基金
美国国家科学基金会;
关键词
20;
D O I
10.1016/0143-8166(90)90046-C
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Several possible sources of inaccuracy that occur in the classical interpretation of caustics patterns generated during transient crack growth in elastic materials are examined using a 'Bifocal Caustics' set-up and a new full field optical technique called 'Coherent Gradient Sensing'. During unsteady dynamic crack growth, strict KdI-dominance is generally absent, especially at times close to crack initiation and arrest, even in regions outside the crack-tip 3-D zone where plane stress conditions persist. In such cases a truly transient higher order expansion is found to be essential for correctly describing stress fields outside the 3-D zone. © 1990.
引用
收藏
页码:183 / 210
页数:28
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