微锻造作用下激光熔覆层应力变化数值模拟
The numerical simulation of the cladding layer’s stress change under micro-forging
李勇
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作者单位：南华大学
中文关键字：微锻造；有限元；应力；激光熔覆
英文关键字：micro-forging；finite element method；stress；laser cladding
中文摘要：本文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，这样能很好的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228.73MPa和-775.37MPa，这与本课题组实验所测量的数据相近似，从而验证了模型的准确性。
英文摘要：This paper takes consider of the cladding layer’s thermal stress and the stress produced by micro-forging, and establishes a reasonable numerical model. The computer simulation is taken use of the finite element method. The results showed that: before micro-forging, cladding layer’s thermal stress is mainly for tensile stress, which is the main cause of crack formation. After micro-forging, the cladding layer’s stress changes the tensile stress into compressive stress, this is a very good way to improve and eliminate the cladding layer’s cracks. The simulation obtained the cladding layer’s stress before and after micro-forging, respectively 228.73MPa and-775.37MPa, which is similar to the experiment measured data in this topic group, and verify the validity of the model.