Analysis of Crack Nonpropagation Behavior during Fatigue Crack Growth

Abstract

Abstract: Fatigue crack propagation tests are carried out under two types of block loading amplitude using a high-precision local compliance measurement. Relationship between the shape change of hysteresis loops and the nonpropagating crack is studied. Based on relationships of compliance change, crack opening/closure phenomena and elastic-plastic behavior near the crack tip in a loading cycle, the mechanism of crack nonpropagation is investigated. It is shown that the profile of nonpropagating crack tip may be cuspate or obtuse at the maximum load. Crack nonpropagation means that there is no tension plastic zone and no compressive plastic zone generated at the crack tip. The loads FRCPG and FRPG are defined according to the residual tension deformation layer in a load cycle, and the equivalence waveforms of crack propagation induced by the crack tip plastic zone at the maximum and minimum loads can be known and used for counting random load waveforms, thus providing a theoretical basis for forecasting the residual life of engineering structure.

Key words: Compliance, Crack opening/closure, Fatigue crack growth, Hysteresis loop, Nonpropagating crack

CLC Number:

TG156

XIONG Ying. Analysis of Crack Nonpropagation Behavior during Fatigue Crack Growth[J]. , 2010, 46(16): 119-124.

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Analysis of Crack Nonpropagation Behavior during Fatigue Crack Growth

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