摘要
目前孔挤压强化过程仿真方面的文献主要是对于残余应力的分析,疲劳寿命主要由试验测量得到,对疲劳寿命的估算较少。通过三维非线性有限元方法,对7075铝合金芯棒和衬套挤压强化过程进行了仿真。分析了不同强化方法强化后的残余应力分布。在残余应力分析的基础上,估算了循环载荷下不强化、芯棒挤压和衬套挤压强化后元件的疲劳寿命;并与相应的试验数据进行了对比。结果表明,疲劳寿命估算结果与试验结果基本一致,估算方法可行。
The FE model of 7075 aluminum alloy was built based on 3-D nonlinear finite element method,which the mandrel cold expansion and split-sleeve expansion were applied to.The residual stress was calculated and fatigue life was predicted.Experiment was carried out on non-cold expansion,mandrel cold expansion and split-sleeve expansion to obtain the fatigue life improvement.Comparison between the result of experiment and the estimated result shows that they are fitting well,the prediction method is proved feasible.
出处
《科学技术与工程》
2011年第12期2787-2791,共5页
Science Technology and Engineering
关键词
孔挤压强化
非线性有限元
残余应力
疲劳寿命
cold expansion nonlinear finite element method residual stress fatigue life
