Abstract
The chapter discusses the evaluation of propagation considering the elasto-plastic behavior on a fatigue crack tip. It emphasizes on the generation of the tensile and compressive plastic zones near the crack tip during fatigue propagation. The relationships between generation and acceleration and deceleration and crack stop phenomena are investigated respectively. The role of each zone of the hysteresis loop denoting the relationship between loads and strains near the crack tip on fatigue propagation is studied by the fatigue crack propagation tests and the Kth test. The chapter clarifies that the elasto-plastic behavior at the crack tip has a great influence on the fatigue crack propagation because the crack closure phenomenon during the cyclic loading is confirmed. The chapter aims to consider the hysteresis loop at the crack tip in detail and clarify the physical role of each zone of the loop.
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