Influence of Computational Grid and Deposit Volume on Residual Stress and Distortion Prediction Accuracy for Additive Manufacturing Modeling
Influence of Computational Grid and Deposit Volume on Residual Stress and Distortion Prediction Accuracy for Additive Manufacturing Modeling
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计算网格和沉积量对增材制造建模残余应力和变形预测精度的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Megahed
中科院分区：
文献类型：
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作者：
O. Desmaison;Pierre;G. Levesque;A. Peralta;S. Sundarraj;A. Makinde;Vijay Jagdale;M. Megahed
粉末床增材制造在成本、批量和复杂产品的可制造性方面具有独特的优势。然而，在这个过程中，使用的能量会导致扭曲。单层的变形可与粉末层厚度相媲美。涂布机叶片与沉积材料之间的接触可能会终止构建过程。此外，累积的残余应力可能导致最终形状与设计的偏差。这项工作的重点是快速残余应力和变形模型的准确性，这些模型既可以提供逐层变形数据，也可以提供最终工件的残余应力和形状。在考虑粉末粒度分布和热源-粉末相互作用的ICME平台上实现了残余应力和变形模型。本文简要介绍了低比例模型，并在对一些大型部件进行可制造性评估和最终工件形状分析之前，记录了残余应力分析所需的数据。
Powder Bed Additive Manufacturing offers unique advantages in terms of cost, lot size and manufacturability of complex products. The energy used however leads to distortions during the process. The distortion of single layers can be comparable with the powder layer thickness. The contact between the coater blade and the deposited material could terminate the build process. Furthermore, accumulated residual stresses can lead to deviations of the final shape from the design. This work focusses on the accuracy of quick residual stress and distortion models that will both provide layer by layer distortion data as well as the final work piece residual stress and shape. The residual stress and distortion models are implemented in an ICME platform that takes powder size distribution as well as the heat source powder interaction into account. Lower scale models are briefly introduced and data required for the residual stress analysis are documented prior to the analysis of some large components assessing manufacturability and final work piece shape.