Mode I cracks subjected to large T-stresses

被引:100
|
作者
Ayatollahi, MR [1 ]
Pavier, MJ
Smith, DJ
机构
[1] Iran Univ Sci & Technol, Dept Mech Engn, Tehran 16844, Iran
[2] Univ Bristol, Dept Mech Engn, Bristol BS8 1TR, Avon, England
关键词
brittle fracture; crack; mode I; T-stress; linear elastic; moderate scale yielding; finite element analysis;
D O I
10.1023/A:1020973802643
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
There are several criteria for predicting brittle fracture in mode I and mixed mode loading. In this paper, the modified maximum tangential stress criterion originally proposed for mixed mode loading, is employed to study theoretically brittle fracture for mode I cracks. In particular, the effect of the non-singular term of stress, often known as the T-stress, on the angle of initiation of fracture and the onset of crack growth is explored. The T-stress component of the tangential stress vanishes along the crack line. Therefore, it is often postulated for linear elastic materials that the effect of T-stress on mode I brittle fracture can be ignored. However, it is shown here that the maximum tangential stress is no longer along the line of initial crack when the T-stress exceeds a critical value. Thus, a deviation in the angle of initiation of fracture can be expected for specimens having a large T-stress. It is shown that the deviation angle increases for larger values of T-stress. Theoretical results show that the apparent fracture toughness decreases significantly when a deviation in angle occurs. Earlier experimental results are used to corroborate the findings. The effect of large T-stresses is also explored for a crack specimen undergoing moderate scale yielding. The elastic-plastic investigation is conducted using finite element analysis. The finite element results reveal a similar deviation in the angle of maximum tangential stress for small to moderate scale yielding.
引用
收藏
页码:159 / 174
页数:16
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