A FINITE-ELEMENT STUDY OF THE NOTCH EFFECT AT SURFACE INCLUSIONS

被引:24
作者
MELANDER, A
机构
[1] The author is with the Swedish Institute for Metals Research, Stockholm
关键词
fatigue; inclusion; pore; stress; thermal stress;
D O I
10.1016/0142-1123(90)90091-R
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Finite-element methods were used to calculate elastic stresses around spherical internal inclusions and semispherical surface inclusions. Both the case of an inclusion which shrinks more slowly than the matrix during cooling after heat treatment, and thus creates residual stresses in the matrix, and the case of an inclusion which shrinks more rapidly than the matrix and debonds from the matrix were considered. The stress distribution around a pore which was used to simulate the debonded inclusion showed maximum stresses at the equator of the pore during tensile loading. The slowly shrinking inclusion showed instead maximum tensile stresses due to mechanical loading in the pole region of the inclusion. The thermal stresses at the slowly shrinking inclusion were significantly larger at the surface inclusion than at the internal inclusion. The implications of the finite-element calculations on initiation and the early growth of fatigue cracks were discussed. © 1990.
引用
收藏
页码:154 / 164
页数:11
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