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为研究多层液滴冷却至室温后内部残余应力分布以及新一层液滴滴下时和原来已经完全冷却区域间的残余应力分布情况,利用有限元分析软件ANSYS对TC4钛合金微滴沉积过程中热应力变化进行模拟仿真。基于参数化设计语言APDL建立有限元分析模型,采用间接耦合的方式模拟热应力,分析区域冷却过程温度场,并将温度场结果数据以载荷的形式加入结构分析中。结果表明:液滴滴落完成时温度扩散程度很小,经过一段时间冷却后,热量由液滴区域向已经冷却区域传递,最后接近于室温;后续滴落液滴区域出现了明显的收缩变形,中间区域向下凹陷;液滴区域靠近分界面附近受到拉应力,而原先冷却区域靠近分界面处受到压应力,但均小于屈服应力,说明新的一层液滴滴下和原先冷却的液滴区域不会产生开裂。
In order to study the distribution of internal residual stress and the distribution of residual stress when a new layer of liquid droplet is dripped and the original cooling area is completely cooled, the finite element analysis software ANSYS was used to study the deposition of TC4 titanium alloy droplet. Simulation of thermal stress changes. Based on the parametric design language APDL, a finite element analysis model was established. The thermal stress was simulated by indirect coupling, the temperature field in the cooling process was analyzed, and the temperature field data were added into the structure analysis with the load. The results show that when the droplet is dripped, the degree of temperature diffusion is very small. After a period of cooling, the heat is transferred from the droplet area to the cooled area and finally to room temperature. The subsequent droplet area shows obvious shrinkage deformation, The middle region is depressed downward; the droplet region is subjected to tensile stress near the interface and the original cooling region is subjected to compressive stress near the interface, but both are less than the yield stress, indicating that a new layer of droplet drips and the original cooled droplet region Will not produce cracking.