Meshfree Simulations for Additive Manufacturing Process of Metals
Meshfree Simulations for Additive Manufacturing Process of Metals
复制标题
金属增材制造过程的无网格模拟
DOI：
10.1007/s40192-019-00131-w
复制
发表时间：
2019
影响因子：
3.3
通讯作者：
Li, Bo
中科院分区：
文献类型：
--
作者：
Fan, Zongyue;Li, Bo
提出了一种基于热优化传输无网格(HOTM)方法的金属加成制造(AM)过程的无网格直接数值模拟方法。HOTM方法是一种无网格热机械拉格朗日计算框架，用于研究材料在极端热机械加载条件下的行为。它结合了最优传输无网格(OTM)方法和变分热力本构修正方法。在HOTM方法中，线性动量守恒方程和能量守恒方程以整体的方式同时求解。建立了一个相敏本构模型，用于自动预测AM过程中金属的熔融/凝固相变和多相混合。应用热流模型对Inconel625裸板的激光焊接过程、对流热损失和辐射热损失进行了模拟，验证了HOTM方法的有效性。模拟结果的性能测量结果，包括熔池几何尺寸和冷却速度，与AM基准测试中的实验数据相当。研究了不同激光功率和激光扫描速度对熔池热力学的影响。
We present a meshfree direct numerical simulation (DNS) capability for the additive manufacturing (AM) process of metals based on the hot optimal transportation meshfree (HOTM) method. The HOTM method is a meshfree thermomechanical Lagrangian computational framework for material behaviors under extreme thermomechanical loading conditions. It combines the optimal transportation meshfree (OTM) method and the variational thermomechanical constitutive updates. In the HOTM method, the linear momentum and energy conservation equations are solved simultaneously in a monolithic way. A phase-aware constitutive model is developed to predict the melting/solidification phase change of metals and multiphase mixing during the AM process automatically. The HOTM method is validated in the simulations of the laser welding process over Inconel 625 bare plate by applying heat flux models for the laser beam, the convective heat loss, and radiation heat loss. The performance measurements of the simulation results, including the melt pool geometric dimensions and cooling rates, are comparable to the experimental data measured in the AM benchmark tests. The influence of various laser powers and laser scanning speeds on the melt pool thermodynamics is also studied.
DOI：
10.1016/j.ijheatmasstransfer.2014.12.052
发表时间：
2015-04-01
影响因子：
5.2
作者：
Kubiak, Marcin;Piekarska, Wieslawa;Stano, Sebastian
通讯作者：
Stano, Sebastian