Author(s)

Hang-Yue Li, Ke-Wei Xu, Nai-Sai Hu & Jia-Wen He

Abstract

Compressive residual stress is an important factor governing the short fatigue crack growth rate particulary for surface rolled or shot peened machine parts. This paper discusses a model of the crack growth rate within a compressive residual stress field. The fatigue crack growth rate can be predicted by effective AKeff, in which the maximum Kmax is modified by residual stress intensity Kr , AKeff = (K^ax+XKr) —Kop. In other words, the compressive residual stress not only increases the crack closure force but decreases Kmax as well, thus the AKeff decreases and so does the crack growth rate. 1 Introduction The fatigue crack closure model suggested by J. C. Newman has been successfully used in predicting the closure force and growth rate of a f

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