【摘要】 本文研究了双向压缩加载条件下孤立裂纹的非共面扩展问题。采用一种直观的物理性手段,引进侧向拉伸系数,使得问题大为简化,采用最大周向应力理论、最小应变能密度因子理论来确定裂纹的开裂角,结果表明,开裂角是加载因子、侧向拉伸系数、最大主压应力与裂纹的夹角及摩擦系数的函数。理论结果与实验结果吻合得较好。更多还原

【Abstract】 In this paper, we investigated the problem of non-coplanar growth of a pre-existing straight crack under biaxial compressive loading. By using a direct physical method and introducing the lateral tension coefficient, it becomes much more simple to solve the problem. The initial extension angle of a crack is determined by applying maximum tangential stress criterion and minimum strain energy density factor criterion. It is shown that the initial extension angle is a function of the loading factor, the lateral tension coefficient, the angle between maximum principal compressive stress and the direction of the crack, and the coefficient of friction.Our results are bassically coincident with the experimental results.更多还原