论裂纹扩展J积分阻力曲线变化规律的影响因素

An Interpretaion of J-R Curves Dependence on Geometric Size of Test Piece

本文对大塑性变形条件下，裂纹稳定扩展过程的J积分阻力曲线变化规律进行了全面的分析。给出了不同约束条件下dJ／da与试样的载荷因子L、裂纹尖端张开角CTOA及裂纹扩展时的瞬时旋转中心的系数r之间的理论表达式。从而论证了不同约束条件下，试样的几何尺寸因素对其J阻力曲线变化趋势的影响规律。

An analysis is given on the whole J-R curve pattern which is got under stable crack growthin a fully plastic region. The formulas for dJ/da with load factor L of test piece,CTOA and instantaneousfactor of rotation r has been given. As a result,the effects of geometric size of test piece on J-R curve un-der different degree of constraint are argued.