【摘要】 以弹塑性断裂力学为基础,分别建立了轴向表面裂纹和周向表面裂纹韧带的极限失稳压力Pu和穿透裂纹的起裂压力Pc的表达式,提出了一种压力管道的"先漏后破"缺陷评定准则:即若管道表面裂纹韧带的极限失稳压力Pu低于相应穿透裂纹的起裂压力Pc,则管道会泄漏失效;若管道表面裂纹韧带的极限失稳压力Pu等于或大于相应穿透裂纹的起裂压力Pc,则管道会爆破失效。该准则得到了一些文献提供的试验数据的验证。更多还原

【Abstract】 Based on the elasto-plastio fracture mechanics, this paper established the expression formulas of limit buckling pressure Pu on the ligament of axial and circumferential surface cracks and the initial pressure for the through cracks Pc. A new Leak Before Break (LBB) assessment criterion was put forward to predict the failure mode of pressure pipes, i.e., when Pu is less than Pc, the pipe will leak; when Pu is equal to or larger than Pc, the pipe will break, which is verified by the test data reported in literatures.更多还原