激光快速成形修复薄壁盘环零件的有限元分析
Finite Element Analysis of Thin?? Wall Ring Part during Laser Rapid Repair
王凯，杨海欧，林鑫，黄卫东
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作者单位：西北工业大学凝固技术国家重点实验室
中文关键字：激光快速成形修复；有限元分析；应力；变形
英文关键字：laser rapid repair; finite element analysis; stress; deformation
中文摘要：针对航空中应用的钛合金薄壁盘环零件激光快速成形修复，建立了3D参数化有限元模型，分析了修复过程中薄壁盘环件的应力和变形演化规律。计算结果表明激光快速成形修复技术成功实现对薄壁盘环零件的修复。彻底冷却后，激光快速修复件的残余应力属于低残余应力水平，零件水平薄壁与竖直薄壁交界处的残余拉应力较大，修复件的整体变形也比较小，两薄壁均在靠近其外端部位置的变形量比其内部要大。冷却阶段的应力分布与熔覆刚完成时的应力分布规律基本相同。随成形修复过程的进行，薄壁修复件的最大变形量增大，冷却时，修复件最大变形量随时间的增加而逐渐减小。
英文摘要：A corresponding 3D parametric finite element models (FEM) is developed to analyze stress and deformation of titanium alloy thin-walled ring part for aviation applications during laser rapid repair (LRR). Simulation result shows that LRR technology can successfully achieve the repair of thin-wall ring part. Residual stress of the part is lower after LRR. The position that horizontal thin-wall and vertical thin-wall contact has maximum residual stress after completely cooled. Integral deformation of the part is also small finally; the edges of both thin walls have larger deformation than their internal. The stress distribution of cooling stage is similar to that cladding is just completed. The maximum deformation of the part gradually increases during laser repairing process, while maximum deformation decreases during cooling after LRR.