内压作用下半圆管夹套容器轴向弯曲应力分析

Analysis of Axial Bending Stress of Half-pipe Jacket Container under Internal Pressure

半圆管夹套容器应用广泛,各国规范内压强度公式合理性值得商榷。采用ANSYS软件较为系统地对半圆管夹套容器进行应力分析,得到轴向弯曲应力系数,并与ASME规范进行对比分析。结果表明,计算参数范围内,当筒体壁厚T <9. 5 mm时,ASME规范中得到的轴向弯曲应力系数远大于有限元分析值,ASME规范偏于保守,其内压计算安全裕度过大;当筒体壁厚T≥19. 1 mm且筒体内径D> 2 500 mm时,轴向弯曲应力系数有限元计算值与ASME规范值基本一致。进一步对轴向弯曲应力系数有限元计算值进行回归拟合,并对回归方程进行了验证。结果可为非标准半圆管夹套结构内压研究及工程应用提供参考。

Vessels with half-pipe jacket are widely used and it is worth considering the rationality of strength calculation formula in the specifications of different countries. ANSYS software was used to sys- tematically analyze the stress of vessels with half-pipe jacket, and the axial bending stress coefficient was obtained, and was compared with that of ASME standard. The results show that within the range of calcu- lated parameters, when the wall thickness of the cylinder T 〈 9.5 mm, the axial bending stress coefficient obtained by the ASME standard is much larger than that of finite element analysis, the ASME standard is conservative, and the safety margin in the internal pressure calculation is too large. When the wall thick- ness of the cylinder T≥19.1 mm and the inner diameter of cylinder D 〉 2 500 ram, the value of the axial bending stress coefficient calculated by finite element method is basically consistent with that of the ASME standard. Furthermore, regression fitting of axial bending stress coefficient calculated by finite element method was made, and the regression equation was verified. The results of present study can provide references for the internal pressure research and engineering application of non-standard half-pipe jacket structure.