【摘要】 以４５号钢正火材料单边Ｖ形缺口试件为研究对象，对缺口根部应力应变场进行了仔细地分析和研究．利用弹塑性断裂力学理论，提出缺口根部分布Ｊ积分的概念．给出了一种新的确定长短裂纹分界点的方法．此方法具有明确的物理意义，其理论值与实测结果吻合较好．更多还原

【Abstract】 The single edge V shaped notch specimens are used as the research subject. The stress strain field at notch root is studied and analyzed in detail. The concept of distribution J integral at notch root is put forward by means of elastic plastic theory. A kind of new method for determining the separating points for fatigue short cracks and long cracks is given,which has a clear physical significance. Good agreement between theoretical results and experimental results has been achieved.更多还原