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通过正火３５钢带孔圆棒试样的旋弯疲劳试验，研究了两级加载下孔边疲劳短裂纹扩展的统计特性，以及应力水平改变对疲劳短裂纹扩展的影响。通过这些研究结果说明了两级加载条件下Ｍｉｎｅｒ累积损伤∑ｎｉ／Ｎｉ围绕１绕动的物理机制。
Through the fatigue test of normal circular 35 round steel bars with round holes, the statistical characteristics of fatigue crack propagation under two-stage loading and the influence of stress level on the expansion of short fatigue cracks were studied. The results of these studies demonstrate the physical mechanism of cumulative damage Σni / Ni around a two-stage loading condition.