摘要
针对缺乏孔挤压强化铰孔后的残余应力分布及寿命预测与评定的分析方法,研究孔挤压强化铰孔工艺的三维有限元模拟方法及挤压强化后铰孔对孔边的残余应力分布的影响.分析结果表明:铰"0"孔后挤入端的残余压应力比不铰孔的明显增大.通过有限元法获得铰孔试样在疲劳载荷作用下孔边的应力分布,结合临界距离法预测3组不同载荷水平下4%孔挤压量钛合金TC4中心孔板的疲劳寿命,预测结果在试验结果的0.5~2.0倍寿命之内.
There is still a lack of method for evaluating the residual stress and fatigue performance of cold expansion specimen with reaming process.Strategies for modelling the cold expansion with reaming process by using three-dimensional finite element method were extensively analyzed.The compressive residual stress at the entrance face is significantly increased by the reaming process.Stress distributions near the strengthened hole under three different fatigue loads were obtained by using elastic-plastic finite element analysis.The fatigue lives of titanium central hole plates with 4% expansion were predicted combined with the critical distance method.The ratio between the predictive and experimental results is within 0.5 to 2.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2017年第8期1610-1618,共9页
Journal of Zhejiang University：Engineering Science
关键词
钛合金
孔挤压强化
非线性有限元分析
残余应力
临界距离法
疲劳寿命
Titanium alloy
cold expansion
nonlinear finite element analysis
residual stress
critical distance method
fatigue life
