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本文将最大应变能释放率理论,最小应变能密度因子理论和最大周向力理论用于计算受轴向拉伸和均匀剪切联合作用的半椭圆表面裂纹板的临界载荷,并与实验结果进行了比较。通过分析,提出将按照最小应变能密度因子理论,利用半椭圆表面裂纹短轴端点的应力场计算出的临界载荷值作为判断裂纹启裂的载荷,给出了复合型断裂准则应用于表面裂纹问题的条件,并给出了LC4CS材料半椭圆表面斜裂纹板受轴向拉伸时临界载荷的近似计算公式。
In this paper, the maximum strain energy release rate theory, the minimum strain energy density factor theory and the maximum circumferential force theory are used to calculate the critical load of the semi-elliptical surface cracked plates subjected to the combination of axial tension and uniform shear, and compared with the experimental results . Based on the analysis of the minimum strain energy density factor theory, the critical load value calculated from the stress field at the short-axis end of semi-elliptical surface crack is taken as the load to judge the crack initiation. The composite fracture criterion is proposed to be applied to the surface crack problem The approximate formula of the critical load of LC4CS semi-elliptical surface slanting crack plate under axial tension is given.