基于连续逐层添加的金属增材制造热-力耦合行为数值模拟研究

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国家科技期刊平台
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中文摘要：金属增材制造是引领第三次工业技术革命的核心技术之一。然而，因过大的残余应力所引发的变形、开裂、抗腐蚀性能下降等问题仍然是阻碍金属增材制造发展的主要瓶颈之一。本文借助开源多物理场仿真平台Elmer，开展了基于连续逐层添加的金属增材制造热-力耦合行为数值模拟研究。其中，连续逐层添加是依据时间与单元位置等信息实时控制单元的激活状态得以实现，应力释放的预测是通过人为将基板的弹性模量设置为很小的值得以实现。针对激光能量输入与基板预热温度对金属增材制造热-力耦合行为的影响，发现随着激光能量输入逐渐降低或基板预热温度逐渐提高，制件的位移逐渐减小，制件的残余应力水平逐渐减弱;相比于激光能量输入，基板预热温度对金属增材制造热-力耦合行为的影响更大。

外文标题：Numerical Simulation of Thermal-Mechanical Coupling Behavior of Metal Additive Manufacturing Based on Continuous Layer-By-Layer Addition

外文摘要：Metal additive manufacturing(MAM)is one of the core technologies leading the third industrial technology revolution.However,the problems of deformation,cracking,and degradation of corrosion resistance caused by excessive residual stress are still one of the major bottlenecks hindering the MAM development.In this paper,a numerical simulation study on the MAM thermal-mechanical coupling behavior based on the continuous layer-by-layer addition was carried out with the help of the open-source multiphysics simulation platform Elmer.Among them,the continuous layer-by-layer addition was realized by controlling the activation state of the elements in real time based on the information of time and elements'positions,and the prediction of stress release was realized by artificially setting the Young's modulus of the substrate to a very small value.With regard to the effects of laser energy input and substrate preheating temperature on the MAM thermal-mechanical coupling behavior,it was found that with the gradual decrease of laser energy input or the gradual increase of substrate preheating temperature,the displacement of the component decreased gradually,and the residual stress level of the component was gradually weakened;compared with the laser energy input,the substrate preheating temperature had a greater effect on the MAM thermal-mechanical coupling behavior.

外文关键词：

thermal-mechanical coupling behaviormetal additive manufacturingresidual stressdisplacementstress releasenumerical simulation

作者：

曹流、朱民富、李峻荣、张沁丹

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作者单位：

广州大学机械与电气工程学院系统流变学研究所,广东广州 510006

关键词：

热-力耦合行为金属增材制造残余应力变形应力释放数值模拟

基金：

广州市科技计划市校(院)联合资助项目广州市科技计划基础与应用基础研究项目

项目编号：

SL2022A03J00959SL2022A04J01376

出版年：

2024

铸造

沈阳铸造研究所中国机械工程学会铸造分会

铸造

CSTPCD

影响因子：0.499

ISSN：1001-4977

年,卷(期)：2024.73(8)