压力容器内外交错分布裂纹的相互作用分析

压力容器在制造、安装以及使用过程中都有可能产生裂纹,这些表面裂纹会随着容器的使用而发生扩展甚至破裂,严重影响了压力容器的使用安全性。因此开展了对压力容器内外壁表面裂纹相互作用的研究。通过使用ANSYS有限元分析软件,建立内压作用下含裂纹压力容器模型,分析了不同倾角以及交错角情况下裂纹应力强度因子的变化规律。发现单裂纹应力强度因子随倾角的增大而减小;内外壁双裂纹的相互影响作用随交错角的增大而减小。研究对含角度双裂纹相互作用下的失效评定具有一定的意义。

Analysis of Interaction Between Staggered Cracks inside and outside in Pressure Vessels

Pressure vessels may be cracked during manufacture, installation and use. These surface cracks may expand or even rupture with the use of the container, which seriously affects the safety of the pressure vessel. Therefore, research on the interaction of cracks on the inner and outer walls of pressure vessels was carried out. By using ANSYS finite element analysis software, the model of crack-containing pressure vessel under internal pressure was established, and the variation of crack stress intensity factor under different dip angles and staggered angles was analyzed. It is found that the stress intensity factor of single crack decreases with the increase of the inclination angle; the mutual influence of the double cracks on the inner and outer walls decreases with the increase of the stagger angle. This study has a certain significance for the failure assessment under the interaction of angled double cracks.