基于修正固有应变理论的金属3D打印过程残余变形预测

针对金属材料3D打印过程模拟异常复杂和耗时问题，以金属材料激光选区熔化(SLM)加工工艺为研究对象，采用修正固有应变方法，实现3D打印过程残余变形的精确快速预测。考虑到3D打印过程的周期性，对连续两个打印层进行热-弹-塑性耦合分析，通过修正固有应变理论，提取3D打印过程等效的修正固有应变载荷；将提取到的修正固有应变逐层施加到弹性有限元模型，实现3D打印过程高效模拟及残余变形精确预测；通过与3D打印完整过程热-固耦合分析及3D打印试验对比，验证修正固有应变方法预测3D打印残余变形的精确性和高效性。

Abstract

To tackle the problem of complexity and time-consuming in simulating the metal 3D printing process, a modified inherent strain method is adopted to achieve accurate and rapid prediction of residual deformation in 3D printing process while taking the metal selective laser melting (SLM) processing process as the research object. Considering the periodicity of 3D printing process, thermal-elastic-plastic coupling analysis is carried out for two successive printing layers, and then the equivalent modified inherent strain load of 3D printing process is extracted based on the modified inherent strain theory. The extracted modified inherent strain is applied to the elastic finite element model layer by layer to realize efficient simulation of 3D printing process and accurate prediction of its residual deformation. At last, the accuracy and efficiency of the modified inherent strain method in predicting 3D printing residual deformation are verified by comparing the results of the thermo-solid coupling analysis and the 3D printing experiment.

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闫晓磊, 杨瑞涛, 练国富, 余捷. 基于修正固有应变理论的金属3D打印过程残余变形预测[J]. 应用激光, 2023, 43(5): 0029. Yan Xiaolei, Yang Ruitao, Lian Guofu, Yu Jie. Residual Deformation Prediction of Metal 3D Printing Process Based on Modified Inherent Strain Theory[J]. APPLIED LASER, 2023, 43(5): 0029.

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