塑料压力管道热板焊接接头瞬时应力有限元分析

Finite-element analyses of instantaneous stresses of hot-plate welded joint of plastic pressure pipes

关键词:  高密度聚乙烯  压力管道  热板焊接接头  瞬态应力  有限元法

Key words:  high-density polyethylene  pressure pipe  hot-plate  welded joint  instantaneous stress  finite-element analyses

摘要:

基于热粘弹性积分型本构关系,考虑材料性能依赖于温度变化及相变潜热的影响,利用有限元软件ANSYS热-力耦合及载荷步功能模拟结晶型高密度聚乙烯塑料压力管道热板焊接过程。并对焊接接头的应力分布进行有限元分析,得到了环向、轴向及径向瞬态应力分布规律。采用盲孔法和锯切法测量焊后残余应力,实测结果与数值分析基本吻合。

Abstract:

Based on constitutive relationship of thermal viscoelastic integral-mode,considering the properties of material,which depend great on temperature fluctuation and the effect of phase-transition latent heat,heat-force coupling function and load step character of ANSYS were employed to simulate the hot-plate welding procedure of high-density polyethylene(HDPE) plastic pressure pipe.The finite-element analyses on stresses distribution of welded joint was conducted,and transient stresses distribution pattern in axial,radial,and circumferential directions were obtained.Residual stresses was measured by the mathar method and the sachs method,and it showed that the actual measured results of the residual stresses are basically coincident with the results of numerical analysis.