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一、引 言 表面裂纹或缺陷是引起实际构件失效的最主要原因之一。从一个小的表面缺陷开始的疲劳裂纹的扩展具有重要的实际意义。通常假定表面裂纹具有半椭圆形,在疲劳扩展过程中,半椭圆表面裂纹的形状(椭圆度)将要发生变化。这种形状变化对于疲劳寿命
I. INTRODUCTION Surface cracks or defects are one of the most important causes of failure of real components. The expansion of fatigue cracks from a small surface defect is of great practical significance. It is usually assumed that the surface crack has a semi-elliptical shape, and the shape of the semi-elliptical surface crack (ellipticity) is to be changed during fatigue expansion. This shape change for fatigue life