Analytical Model for Fatigue Crack Closure = 피로균열단에서의 균열닫힘에 대한 이론적 모델

다국어 초록 (Multilingual Abstract)

For a given fracture geometry, in which asperity contact occurs, the closure stress intensity factors are calculated in terms of asperity dimension, location, and contact loads using an idealized contact model. From the analysis, the effects of both asperity location and dimension on the crack closure stress intensity factors were investigated. The most important result from the analytical work is that experimental measurements can be interpreted in light of analytical calculations which account for full scale specimen geometry and the crack length. Also, the analytical model shows that it can incorporate closure measurements obtained from micro-radiographical technique like XTM into the development of a modified forcing function appropriate for fatigue crack propagation. Most significantly, it was shown that, using analytical crack tip displacements and crack morphology, micro-structural entities are related to the closure stress intensity factors.