压力容器接管区应力场有限元分析

Analysis of the finite element method of stress field for simulating pressure vessel nozzles

针对压力容器接管区局部高应力高应变区的状态和裂纹的断裂规律特征,对多种孔径的异型板应力应变场应用弱协调元,建立单元间位移弱连续条件的协调有限元模型,不需要应力满足平衡条件,因此可以解决常规有限元难以适应的奇异性领域。本文分别就不带裂纹和带有裂纹的异型板进行应力分类数值分析,为压力容器接管部位的设计和裂纹疲劳扩展分析提供了可靠依据。

According to high strain gradients characteristic at the junction between pressure vessel and nozzle,based on simulating shape plate of pressure vessel nozzle,weak-conforming element models are established for two types of special shape plates,which satisfied weak continuous conditions between elements.The weak-conforming element methods do not need satisfy stress equilibrium conditions.It can solve the conventional finite element difficult to adapt to the singularity of the field.The stresses are obtained by means of weak-conforming element method.The calculation results are in accordance with those of experiment results.This paper provides the foundation for the design of special shape plates and analysis of extending crack.