微锻造作用下激光熔覆层应力变化数值模拟  

Numerical Simulation of Cladding Layer's Stress Change Under Micro-forging

作　　者：李勇[1] 邱长军[1] 

机构地区：[1]南华大学机械工程学院,湖南衡阳421001

出　　处：《热加工工艺》2012年第2期137-139,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(5077510650974075)

摘　　要：综合考虑了熔覆层热应力与由微锻造作用产生的应力共同作用的结果,并建立了合理的数值分析模型。利用有限元法进行计算模拟。结果表明:微锻造前,熔覆层的热应力主要表现为拉应力,这也是导致裂纹产生的主要原因;微锻造后,熔覆层的应力由拉应力转变为压应力,这样能很好地改善和消除熔覆层裂纹。模拟分析得出锻造前、后熔覆层应力分别为228.73、-775.37 MPa,与实验所测量的数据相近似,从而验证了模型的准确性。A reasonable numerical model was established taking consider the thermal stress and the micro-forging stress of cladding layer.The computer simulation was carried out using the finite element method.The results show that： before micro-forging,thermal stress of cladding layer is mainly for tensile stress,which is the main cause of crack formation.After micro-forging,the stress of cladding layer changes the tensile stress into compressive stress,this is a very good way to improve and eliminate the cladding layer＇s cracks.The simulation can obtaine the stress before and after micro-forging,respectively 228.73 MPa and-775.37 MPa,which is similar to the experiment measured data in this topic group,and verify the validity of the model.

关 键 词：微锻造 有限元 应力 激光熔覆 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]