双参数断裂准则为一种估算结构剩余强度的简单方法, 然而原始推导过程应用了一些假设.为了给出更严谨的证明, 从Neuber公式出发严格推导双参数断裂准则公式.用试样的初始裂纹长度代替临界裂纹尺寸, 以简化该准则.运用简化的双参数断裂准则估算M (T) 、C (T) 试样以及复杂结构 (三孔拉伸试样) 的剩余强度.结果表明:运用简化的双参数断裂准则估算M (T) 、C (T) 试样的剩余强度时, 估算误差在7％以内;运用简化的双参数断裂准则估算复杂结构 (三孔拉伸试样) 的剩余强度时候, 估算误差在5％, 说明双参数断裂准则可以用于加筋壁板剩余强度的预测.%Two parameter fracture criterion is a simple method to predict residual strength. However, some assumptions were taken by the initial derivation process. To provide a more rigorous deduction, two parameter fracture criterion is derived strictly based on Neuber equation. Besides, two parameter fracture criterion is simplified by replacing specimens' critical crack lengths with initial crack sizes. The residual strengths of M (T) and C (T) are predicted by this simplified method, and the estimated errors are less than 7％. In order to verify the capability of this simplified method to predict the residual strength of complex structures, the residual strengths of three-hole crack tension specimens are predicted, and all of these discrepancies are less than 5％, It shows that two parameter fracture criterion could predict residual strength of stiffened panels.
展开▼
