Efficient Simulation Methods for Thermal-Mechanical Coupled Analysis and Rapid Residual Distortion Prediction of Laser Melting Deposition Process,Steel Research International

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Efficient Simulation Methods for Thermal-Mechanical Coupled Analysis and Rapid Residual Distortion Prediction of Laser Melting Deposition Process
Steel Research International ( IF 1.9 ) Pub Date : 2021-05-11 , DOI: 10.1002/srin.202000615
Xiankun Cao ₁ , Chenghong Duan ₁ , Xiangpeng Luo ₁

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Herein, an improved thermal-mechanical coupled analysis is used to increase the calculation efficiency of the detailed laser melting deposition (LMD) process. By optimizing the loading process of the laser heat source and lumping several deposited layers into an equivalent numerical layer, the efficiency is significantly improved. The calculation time is saved by 85% when lumping six layers. Compared with the experimental data, the minimum deviation of predicted maximum distortion reaches 3.2% when lumping four layers. A multiscale method is proposed to predict the distortion result of the large-sized part efficiently. In this method, the optimal heights of equivalent numerical layers are explored. The comparisons with the experimental result show that the optimal heights of equivalent numerical layers are 1 and 1.5 mm in view of accuracy and efficiency. Based on the multiscale method, the residual distortion of the substrate after depositing a large-sized eight-layer line deposition structure is accurately predicted. The deviations of the maximum distortion predicted by the improved thermal-mechanical coupled simulation and the multiscale method are 3.26% and 6.12%, respectively. Moreover, the calculation time of the latter is 98.8% less than that of the former.

中文翻译：

激光熔化沉积过程热机耦合分析和残余畸变快速预测的高效仿真方法

在此，改进的热机械耦合分析用于提高详细激光熔化沉积 (LMD) 过程的计算效率。通过优化激光热源的加载过程，将几个沉积层集中到一个等效的数值层中，效率得到显着提高。6层集总计算时间节省85%。与实验数据相比，四层集总时预测的最大畸变的最小偏差达到3.2%。提出了一种多尺度方法来有效预测大尺寸零件的畸变结果。在该方法中，探索了等效数值层的最佳高度。与实验结果的对比表明，等效数值层的最佳高度为1和1。5 mm 考虑到精度和效率。基于多尺度方法，准确预测了大尺寸八层线沉积结构沉积后基板的残余畸变。改进的热机耦合模拟和多尺度方法预测的最大畸变偏差分别为3.26%和6.12%。而且，后者的计算时间比前者少98.8%。

更新日期：2021-05-11

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