低压储蓄罐接管结构裂纹机理及仿真分析

Crack Mechanism and Simulation Analysis of Nozzle Structure of Low-Pressure Storage Tank

基于卧式储蓄罐上标准椭圆封头的开孔接管处裂纹的产生,考虑裂纹产生因素的影响,采用模拟仿真软件ANSYS对液化天然气储蓄罐的接管处裂纹结构进行仿真模拟,并对此进行应力分析。研究结果表明:压力容器裂纹最先出现在集中应力最大处,也就是接管焊接接口位置,会导致焊缝中的原子结合遭到破坏,形成新的界面而产生裂纹;并且在裂纹处会发生应力集中现象,在裂纹处的交变应力和腐蚀介质的相互作用下,裂纹进一步延伸开裂。

Based on the occurrence of cracks at the opening nozzle of the standard elliptical head on the horizontal storage tank considering the influence of the cracking factors, The simulation software ANSYS is used to simulate the crack structure at the nozzle of the liquified natural gas storage tank, and the stress analysis is carried out. The research results show that: the pressure vessel cracks first appear at the place where the concentrated stress is the greatest, that is, the welding interface position of the nozzle, which will lead to the destruction of the atomic bond in the weld and the formation of a new interface, resulting in cracks. And stress concentration will occur at the cracks. Under the interaction of the alternating stress at the cracks and the corrosive medium, the cracks will further extend and crack.