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Plastic collapse of pipe bends under combined internal pressure and in-plane bending

机译:内压和面内弯曲共同作用下弯管的塑性塌陷

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摘要

Plastic collapse of pipe bends with attached straight pipes under combined internal pressure and in-plane closing moment is investigated by elastic–plastic finite element analysis. Three load histories are investigated, proportional loading, sequential pressure–moment loading and sequential moment–pressure loading. Three categories of ductile failure load are defined: limit load, plastic load (with associated criteria of collapse) and instability loads. The results show that theoretical limit analysis is not conservative for all the load combinations considered. The calculated plastic load is dependent on the plastic collapse criteria used. The plastic instability load gives an objective measure of failure and accounts for the effects of large deformations. The proportional and pressure–moment load cases exhibit significant geometric strengthening, whereas the moment–pressure load case exhibits significant geometric weakening.
机译:通过弹塑性有限元分析,研究了在组合的内压和面内闭合力矩作用下直管的弯头的塑性塌陷。研究了三种载荷历史,比例载荷,顺序压力-力矩载荷和顺序力矩-压力载荷。定义了三类延性破坏载荷:极限载荷,塑性载荷(具有相关的塌陷标准)和不稳定性载荷。结果表明,对于所有考虑的荷载组合,理论极限分析并不保守。计算出的塑料载荷取决于所使用的塑料塌陷标准。塑性不稳定性载荷给出了破坏的客观度量,并说明了大变形的影响。比例和压力-力矩荷载情况显示出明显的几何增强,而力矩-压力荷载情况显示出明显的几何减弱。

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