Selective laser melting (SLM) has gained large interest due to advanced manufacturing possibilities. However, the growing potential also necessitates reliable predictions of structures in particular regarding their long-term behaviour. The constitutive and structural response is thereby challenging to reproduce, due to the complex material behaviour. This motivates the aims of this contribution: To establish a material model that accounts for the behaviour of the different phases occurring during SLM but that still allows the use of (basic) process simulations. In particular, the present modelling framework explicitly takes into account the mass fractions of the different phases, their mass densities, and specific inelastic strain contributions. The thermomechanically fully coupled framework is implemented into the software Abaqus. The numerical examples emphasise the capabilities of the framework to predict, e.g., the residual stresses occurring in the final part. Furthermore, a postprocessing of averaged inelastic strains is presented yielding a micromechanics-based motivation for inherent strains.

中文翻译：

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选择性激光熔化过程的计算相变模型

由于先进的制造可能性，选择性激光熔化 (SLM) 引起了人们的极大兴趣。然而，不断增长的潜力也需要对结构进行可靠的预测，特别是关于它们的长期行为。由于复杂的材料行为，本构和结构响应因此难以再现。这激发了这一贡献的目标：建立一个材料模型，该模型考虑了 SLM 期间发生的不同阶段的行为，但仍允许使用（基本）过程模拟。特别是，本建模框架明确考虑了不同相的质量分数、它们的质量密度和特定的非弹性应变贡献。热机械全耦合框架在软件 Abaqus 中实现。数值示例强调了框架预测的能力，例如，在最终零件中出现的残余应力。此外，提出了平均非弹性应变的后处理，为固有应变提供了基于微观力学的动机。