X75海底管线管应变极限的数值模拟

杨秀芝; 杨春杰; 董春法

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X75海底管线管应变极限的数值模拟
Numerical simulation of strain limit of X75 submarine line pipe steel
2018年48卷第6期页码：79-82
纸质出版：2018
DOI：
稿件说明：

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杨秀芝, 杨春杰, 董春法. X75海底管线管应变极限的数值模拟[J]. 电焊机, 2018,48(6):79-82. DOI：

YANG Xiuzhi, YANG Chunjie, DONG Chunfa. Numerical simulation of strain limit of X75 submarine line pipe steel[J]. Eletric Welding Machine2018, 48(6): 79-82. DOI：

摘要

采用ANSYS软件对X75海底管线管在不同的变形速率、内部压强、力学性能(屈强比、刚度等)等条件下的拉伸变形进行计算模拟

分析应变速率、内压、屈强比及刚度对X75海底管线管拉伸变形应力应变极限的影响规律。结果表明

当内压一定时

随着应变速率的增大

极限应力整体上呈逐渐增大趋势

极限应变整体上呈减小趋势;当应变速率一定时

随着内部压强的增大

极限应力和极限应变整体上呈逐渐增大趋势;随着屈强比的增大

抗拉极限应力应变呈先减小后增大的趋势;随着刚度的变化

极限应力和极限应变呈现不同的变化趋势。变化规律与实际相符

计算结果真实可信

可以为实际工业生产提供参考。

Abstract

Considering different deformation conditions including various specifications

mechanical properties（such as yield ratio

uniform elongation

etc.） and internal pressure of X75 submarine steel pipeline

ultimate stress and strain was analyzed during the tensile deformation process by using ANSYS software.The results showed that

the ultimate stress overall increased gradually but the ultimate strain showed an overall decreasing trend with the increase of strain rate when the pressure was constant;the ultimate stress and limit strain overall showed a gradually increasing trend with the increase of internal pressure when the strain rate was constant;the ultimate stress and strain decreased firstly and then increased with the increase of yield ratio

while they showed a different trend with the change of stiffness.This change was in accordance with the practical condition.The simulation results were reliably and could provide a reference for the industrial production.