THE EFFECTS OF OVERLOADS IN FATIGUE CRACK-GROWTH

被引:43
作者
CARLSON, RL
KARDOMATEAS, GA
BATES, PR
机构
[1] The authors are in the School of Aerospace Engineering, Georgia Institute of Technology, Atlanta
关键词
CRACK GROWTH; OVERLOADS; DISCRETE ASPERITIES MODEL;
D O I
10.1016/0142-1123(91)90479-I
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Several theories have been proposed to explain the transient fatigue crack growth decelerations and accelerations which follow overloads. The mechanisms that have been proposed to explain retardation after a tensile overload, for example, include residual stress, crack deflection, crack closure, strain hardening, and plastic blunting/resharpening. These mechanisms are reviewed in the light of recent experimental results, and implications with regard to their applicability are examined. It is suggested that no single mechanism can be expected to represent observed effects over the entire range of da/dN versus DELTA-K; eg, behaviour ranging from the near threshold region to the Paris region.
引用
收藏
页码:453 / 460
页数:8
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