厚壁圆筒自增强理论与数值模拟对比分析  

Comparison of Theory and Numerical Simulation for Thick-walled Cylinder Autofrettage

作　　者：周谧[1] 林铁军[2] 周健[1] 

机构地区：[1]四川理工学院工程实践中心,四川自贡643000 [2]西南石油大学油气藏地质及开发国家重点实验室,四川成都610500

出　　处：《压力容器》2017年第6期14-18,共5页Pressure Vessel Technology

基　　金：国家自然科学基金项目(No.51504207)

摘　　要：自增强处理技术能有效提高设备承载能力,在高压和超高压设备中具有广泛应用。在第三强度理论的基础上提出厚壁圆筒最佳自增强处理内压的简便计算公式,有助于设计人员快速确定最佳自增强处理内压。并利用有限元软件,建立了厚壁圆筒力学模型,对比自增强处理前后厚壁圆筒的应力分布,从分析结果可以看出,对于提高圆筒承载能力,自增强处理技术具有明显优势。同时,对厚壁圆筒有限元模型施加不同自增强处理内压,得到相同工作压力作用下不同自增强处理内压与厚壁圆筒最大应力值的关系曲线,从而确定厚壁圆筒的最佳自增强处理内压值。对比所推导的理论公式计算值,误差仅为6%,符合工程设计计算要求,可以在机械加工工程领域应用推广。Autofrettage processing technology can effectively improve the carrying capacity of equipment, in high pressure and ultra-high pressure equipment has a wide range of applications. Based on the third strength theory, this paper presents a simple calculation formula for the best autofrettage internal pressure of thick-walled cylinder, which helps designers to determine the best autofrettage internal pressure quick- ly. And the finite element software was used to establish the mechanical model of the thick-walled cylin- der. The stress distribution of the thick-walled cylinder before and after the autofrettage processing was compared. From the analysis results,it can be seen that the autofrettage processing technology has obvious advantages for improving the bearing capacity of the cylinder. At the same time, different autofrettage in- ternal pressure is applied to the finite element model of the thick-walled cylinder, and the relationship be- tween the autofrettage internal pressure and the maximum stress value of the thick-walled cylinder underthe same working pressure is obtained to determine the best autofrettage internal pressure. Compared with the theoretical formula, the error is only 6%, which is in accordance with the requirements of engineering design and can be applied in the field of mechanical engineering.

关 键 词：厚壁圆筒 自增强压力 弹性-塑性力学 有限元分析 

分 类 号：TH49[机械工程—机械制造及自动化]