A numerical investigation on the effect of an overload on fatigue crack opening and closure behaviour

被引:36
作者
Ellyin, F [1 ]
Wu, J [1 ]
机构
[1] Univ Alberta, Dept Mech Engn, Edmonton, AB T6G 2G8, Canada
关键词
crack closing; crack growth; crack opening stress; crack opening displacement; cyclic loading; finite element analysis; plastic deformation; residual stresses and strains;
D O I
10.1046/j.1460-2695.1999.00223.x
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The effect of a superimposed single tensile overload or a compressive overload in a block of constant-amplitude cycles on the crack opening and closing stresses is investigated using an elastic-plastic finite element analysis. The results obtained are in basic agreement with the experimental observations. Following an applied tensile overload cycle, the crack opening and closing stresses increase instantaneously, while the imposition of a compressive overload cycle results in a small decrease of the crack opening and closing stresses. A detailed discussion of the residual stress and strain patterns caused by the plastic deformation during the overload cycle and the corresponding crack profiles is included. The main governing mechanism resulting in the change of crack growth due to an overload is pointed out.
引用
收藏
页码:835 / 847
页数:13
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