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在外部载荷超过管道所能承受范围时管道即发生失效。通过研究管道在外力作用下的力学性能,有助于确定管道失效时的应力或应变的临界值,根据是取应力还是取应变作为衡量管道失效时的指标,分别有基于应力的失效判据和基于应变的失效判据。合理选用管道失效判据,可以节约管道投资、延长管道使用时间。简介材料应力—应变曲线的一般特征,分析管道基于应力的失效判据和基于应变的失效判据的方法。
The pipe fails when the external load exceeds the range that the pipe can withstand. By studying the mechanical properties of pipeline under external force, it is helpful to determine the critical value of stress or strain at failure of pipeline. Based on whether the stress is taken or the strain taken as a measure of pipeline failure, stress-based failure criterion and Based on strain of failure criterion. Rational use of pipeline failure criteria, you can save pipeline investment and extend pipeline life. Briefly introduce the general characteristics of the material stress-strain curve, the method of analyzing the stress-based failure criterion of pipes and the strain-based failure criterion.