X80钢级大口径热压三通力学分析

摘要

T-pipe in its working pressure of the stress distribution state was needed to be ensured by hot-embossing T-pipe theory design. So it is necessary to determine relationship between the stress of the hot-embossing T-pipe in its working pressure of the stress distribution and the inner and outer radius of the T-pipe.Based on elastic-plastic finite element theory and BISO ma-terial model, FEM numerical simulation was applied to the inner and outer radius of the T-pipe relationship between the stress of the X80 pipe steel hot-embossing equal diameter T-pipe using FEA software ANSYS. The analysis results show that the maximum stress appears in the hot-embossing T-pipe inside of the shoulders, which is the weakest;Increasing the wall thickness can effec-tively reduce the hot-embossing T-pipe junction area and abdominal stress level; To increase the shoulder transition arc can re-duce the stress of the junction area;Increasing the thickness of wall tee has little influence on stress concentration index.%热压三通的理论设计需要了解三通在其工作压力下的应力分布状态,因此,有必要确定热压三通在其工作压力下的应力分布与三通内、外圆弧半径大小之间的关系. 采用弹塑性有限元方法和双线性等向强化材料模型,采用有限元分析软件ANSYS对X80钢级大口径等径热压三通内、外圆弧半径与三通受力关系进行了研究. 分析结果表明:最大应力出现在热压三通肩部的内侧,该处最薄弱;增大壁厚能有效降低热压三通相贯区和腹部的应力水平;增大肩部过渡圆弧可以降低主、支管过渡区的最大应力;增大壁厚对三通内壁上的应力集中指数影响不大.