| 摘要: |
| 采用移动热源模拟激光光束移动，结合生死单元技术，分别建立多个不同形状的成形件有限元模型，采用热-结构间接耦合的方法，分别进行热弹塑性有限元分析。分析结果表明：SLM成形过程中，在激光扫掠位置温度最高，并形成熔池，熔池深度保证其能形成良好的冶金结合；SLM成形过程中存在循环加热的过程，该过程有助于降低残余应力；成形件最终残余应力和变形分布与实验结果相符，且未发生大变形和开裂。 |
| 关键词: 选区激光熔化 有限元分析 生死单元 热-结构耦合 |
| 基金项目:上海市青年科技英才扬帆计划（14YF1414400）；上海工程技术研究中心建设项目（15DZ2251000）。 |
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| Thermal Elastoplastic FEM Analysis in SLM Process based on ANSYS |
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Ai Baiyun Jiang Yong Ke Linda Yao Fei Li Zhongquan Deng Zhujun
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Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600
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| Abstract: |
| By using moving heat source to simulate laser beam and by using birth-death element method, thermal-structural coupling FEM models of two different shapes have been built to analyze fields of temperature, stress and deformation. The conclusions are shown below: in SLM process, the top temperature is shown up at laser scanning position in which molten pool forms. The depth of molten pool is useful to fusion metals. Heat cycling is found across the whole SLM process which is helpful to reduce residual stress. The fields reduce residual stress and deformations are fit to real experiments and the value is reasonable. |
| Key words: SLM FEM birth-death element thermal-structural coupling |
