A THEORY OF CAUSTICS FOR MIXED-MODE FAST-RUNNING CRACKS (HIGHER-ORDER THEORY)

被引：1
|
作者：
NISHIOKA, T
MURAKAMI, R
OHISHI, Y
MAEDA, N
机构：
来源：
JSME INTERNATIONAL JOURNAL SERIES A-MECHANICS AND MATERIAL ENGINEERING | 1994年 / 37卷 / 01期
关键词：
EXPERIMENTAL STRESS ANALYSIS; DYNAMIC CRACK PROPAGATION; OPTICAL METHOD; METHOD OF CAUSTICS ASYMPTOTIC SOLUTIONS; HIGHER-ORDER TERMS;
D O I：
10.1299/jsmea1993.37.1_22
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
A higher-order theory of caustics for mixed-mode running cracks is developed by using the general asymptotic solutions for a dynamically propagating crack tip. The analytical expressions are obtained for the Jacobian equation that determines the initial curve, and for the image equations on a screen. With the use of the higher-order coefficients determined by the finite-element simulations of actual dynamic fracture experiments, the effects of the higher-order terms on the caustic curve are investigated on the basis of the present theory. It was found that the r1/2 stress field plays an important role in the formation of caustic patterns. A higher-order theory of caustics for stationary cracks is also derived in this paper.
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页码：22 / 30
页数：9
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