基于ANSYS对某含有凹坑缺陷发酵罐的静力分析

Static Analysis of Fermentation Tank With Pit Defect Based on ANSYS

对含有凹坑缺陷的发酵罐按照GB/T19624-2004《在用缺陷压力容器安全评定》进行安全性评定,在此基础上利用ANSYS对不同间距的轴向排列的多凹坑进行静力分析,得到轴向排列的多凹坑的最大应力值和应力集中系数与相邻凹坑间距和数量的关系。经过分析可知,当相邻凹坑间距增大到L/X≥3.0时,各凹坑之间的应力分布几乎无影响;应力集中系数随着两凹坑中心距的增加而减小,当间距L/X<3时其变化幅度较大,当L/X≥3后趋于恒定;同时最大应力值和应力集中系数与凹坑缺陷数量成正比,而与相邻的凹坑间距成反比。

Safety assessment of fermentation tank with pit defect was carried out in accordance with GB/T19624-2004 "Safety Assessment of Pressure Vessels with Defects in Use". On this basis, the static analysis of multi-pits with different spacing was carried out by ANSYS, and the maximum stress value and stress concentration coefficient of multi-pits with axial arrangement and between adjacent pits were obtained. The relationship between distance and quantity showed that when the distance between adjacent pits increased to L/X≥3.0 the stress distribution between the pits had little effect. The stress concentration factor decreased with the increase of the distance between the two pits, the variation range was larger when the distance L/X<3 and tended to be constant while the distance L/X>3. At the same time, the maximum stress value and the concentration factor were proportional to the number of pit defects and inversely proportional to the distance between adjacent pits.