【摘要】 工作在地震、泥石流等地质灾害多发区的管线,必须承受较大的位移,其变形能力是非常重要的。针对两种钢级、两个系列(X70-1,X70-2,X80-1,X80-2)的四种管线管,采用有限元法、四结点壳单元对其压缩变形能力进行研究。结果表明压缩载荷作用下管体发生轴对称模式的屈曲,屈曲部位起皱,并有应力、应变集中。其中2系列管的屈曲应变及极限应变高于1系列管,二者在力学性能方面的主要区别在于其屈强比、形变强化指数、均匀伸长率不同,研究结果显示,降低管材屈强比、提高应变强化指数及均匀伸长率,可有效提高管线管的抗压缩变形能力。更多还原

【Abstract】 Deformability is very important for pipelines working in harsh geology areas where earthquake or land slid always occur,in that conditions pipelines will sustain large displacement and strain based design is suitable. Deformability of two type high grade line pipes(X70-1,X70-2,X80-1,X80-2) was studied with finite element method(FEM),4 nodes shell element was used in analysis.The results show that pipe will buckle in symmetry mode near the two ends of pipe under compression load.In the local buckled area,wrinkles will form;stress and strain will concentrate.The pipes of X70-2 and X80-2 with lower yield ratio,higher strain hardening exponent and higher uniform elongation,show higher buckling strain,higher limit strain and higher deformability.So the effective ways to improve the deformability of line pipes are to decrease yield ratio,increase strain hardening exponent or uniform elongation.更多还原