基于统一强度理论的自紧身管残余应力分析
Analysis of Residual Stress of Auto-fretted Barrel Based on Unified Strength Theory
佟海生 1樊江涛 2李强2
作者信息
- 1. 内蒙古北方重工业集团有限公司, 内蒙古 包头 014033
- 2. 中北大学 机电工程学院, 山西 太原 030051
- 折叠
摘要
基于统一强度理论,考虑材料拉压异性和鲍辛格效应的影响,采用双线性强化材料模型对身管进行自紧分析,推导了身管加载应力、卸载应力、残余应力及工作应力的解析解,得到了弹塑性交界面半径、反向屈服半径的计算公式,提出了最佳自紧度和自紧压力的计算方法,通过与实验数据进行对比,验证了本文理论解的正确性,分析了材料拉压强度比、中间应力系数等参数对身管残余应力、弹塑性交界面半径、反向屈服半径和最佳自紧压力的影响.结果表明,反向屈服半径、弹塑性交界面半径、弹塑性交界面处残余应力与材料拉压强度比成正比,与中间应力系数成反比;最佳自紧压力与材料拉压强度比成反比,与中间应力系数成正比.
Abstract
Based on the unified strength theory,considering the influence of material tension-compres-sion anisotropy and Bauschinger effect,a bilinear strengthening material model was used to analyze the auto-fretted barrel,and analytical solutions of loading stress,unloading stress,residual stress and working stress of the barrel were derived.The calculation formulas of the elastic-plastic interface radius and reverse yield radius were obtained,and the calculation methods of the optimum autofrettage degree and autofrettage pressure were proposed.The correctness of the theoretical solutions was verified by comparison with the experimental data,and the influences of material tensile strength ratio,intermedia-te stress coefficient and other parameters on the residual stress,elastic-plastic interface radius,reverse yield radius and optimum autofrettage pressure of the barrel were analyzed.The results show that the reverse yield radius,elastic-plastic interface radius and residual stress at the elastic-plastic interface are proportional to the material tensile strength ratio and inversely proportional to the intermediate stress coefficient;the optimum autofrettage pressure is inversely proportional to the material tensile strength ratio and proportional to the intermediate stress coefficient.
关键词
残余应力/统一强度理论/鲍辛格效应/双线性强化模型/反向屈服Key words
residual stress/unified strength theory/Bauschinger effect/dual linear strengthening model/reverse yield引用本文复制引用
出版年
2024
NETL
NSTL
万方数据