厚壁圆筒最佳自紧压力的有限元分析  

The finite element analysis of the best autofrettaged pressure of thick-walled cylinder

作　　者：周敏华[1] 李晓谦[1] 刘荣光[1] 吴钰[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《现代制造工程》2008年第8期111-114,共4页Modern Manufacturing Engineering

摘　　要：考虑厚壁圆筒在发生塑性变形后材料的强化及鲍辛格效应,建立与实际材料一致的数学模型来求解自紧压力与弹塑性分界半径的关系,以确定自紧压力的取值范围。并提出了最佳自紧压力的评定方法及求解过程,然后使用Chaboche循环塑性本构模型,模拟材料循环硬化及鲍辛格效应对残余应力的影响,并通过Marc有限元软件对厚壁圆筒的自紧及工作过程进行仿真,分析残余应力及工作过程中的最大应力与自紧压力的关系,通过比较,找出厚壁圆筒最大等效应力(包括平时及工作状态)与自紧压力的关系曲线,最后求出最佳自紧压力。The material＇s rigidification and bauschinger effect has been considered after thick-walled cylinder come into plasticity, founded the mathematic model which is the same to the fact to solve the relation between autofrettaged pressure and dividing line of elasticity and plasticity, to confirm the range of autofrettaged pressure. Moreover, the method which can assess the best autofrettaged pressure of thick-walled cylinder and process of solvent has been raised, then simulated material＇s circulatory rigidification and Bauschinger effect on residual stress by using Chaboche model, and simulated the process of thick-walled cylinder aggrandizement and working by Marc, analyzed the relationship between autofrettaged pressure and the maximum residual stress or workingstress ,found the mutative curve of autofrettaged pressure and the maximum equivalent stress（ include working and non-working） , at the end calculated the best autofrettaged pressure.

关 键 词：厚壁圆筒 有限元 鲍辛格效应 自紧压力 

分 类 号：TJ38[兵器科学与技术—火炮、自动武器与弹药工程]