厚壁圆筒自增强处理的数值模拟

Numerical Simulation of Autofrettage of the Thick-Walled Cylinder

弹塑性理论的自增强技术可以提高厚壁圆筒的承载能力,推导了厚壁圆筒在内压作用下的自增强压力,并基于ANSYS分析结果对解析值进行验证。采用三个载荷步加载,对厚壁圆筒的自增强处理过程进行了弹塑性有限元模拟分析,得出了不同阶段应力的分布规律。在弹性状态下,分析值与解析值误差小于0.4%,从而验证了模拟分析的可靠性。在分析过程中得到的一些值得注意的规律及图形可供工程设计时参考,也使得弹塑性理论公式中参数间的关系和变化规律更清晰。

Based on elastic-plastic theory, autofrettage technology can improve the carrying capacity of thick-walled cylinder. The antofrettage pressure of the thick -walled cylinder under internal pressure is analyzed. The numerical solutions are compared with those analytic results obtained by analysis based on ANSYS. By applying three load steps, distribution laws of the stresses during each phase were obtained via an elastic -plastic finite element analysis of thick -walled cylinder. The discrepancy between the analytic solution and numerical solution was less than 0.4% in the elastic state, which proved that simulation analysis was reliable and feasible. The noticeable laws, data and charts obtained in the course of aanlysis and can be used as the reference in the engineering design, and they make the relations and variation laws among the parameters of elastic-plastic theory more clear.