U形管结构参数对外压失稳临界压力的影响

Affect Analysis of U-Tube Structure Parameters on Buckling Critical Pressure

利用ANSYS有限元分析软件提供的特征值屈曲分析技术,针对不同圆度偏差及弯管半径的U形管弯管段,进行了外压失稳临界压力的计算。从计算结果可知,在相同弯管半径条件下,U形管弯管段的外压失稳临界压力随管子圆度偏差的增大,外压失稳临界压力将先增大后减小。随着U形管弯管半径的增加,外压失稳临界压力的临界值会不断减小。在相同弯管半径及圆度偏差相等的条件下,U形管壁厚的减薄量对临界失稳压力值的影响更大。

The buckling critical external pressure on U-Tube of different roundness deviations and bending radii were simulated by eigenvalue buckling analysis based on ANSYS. The result showed that： the buckling critical pressure first increases and then decreases with increasing roundness deviation when the bending radius is the same; the critical value of buckling critical pressure decreases with increasing bending radius; the sensitivity of wall thickness reduction on buckling critical pressure is larger in the same bending radius and roundness deviation.