Abstract A computational approach to simulating the deformation response of additively manufactured aluminum alloys is presented. A three-dimensional microstructure with the grain geometry typical for aluminum alloys produced by selective laser melting is generated by the method of step-by-step packing. The grain behavior is described in terms of crystal plasticity with explicit consideration of the slip systems. A phenomenological equation is used to describe the critical resolved shear stress taking into account the grain cellular-dendritic substructure, grain boundary strengthening, and strain hardening. The microstructure-based constitutive model is used in simulations of quasistatic tension. In order to reduce the computational costs, quasistatic loading is simulated in terms of dynamics using an explicit time integration scheme which provides high numerical efficiency for solving non-linear problems. The calculation results for a polycrystalline model of additively manufactured aluminum alloy subjected to tension and shear along three different directions are presented to illustrate what might be obtained from the micromechanical simulations.

中文翻译：

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增材制造铝合金的微观力学模拟

摘要 提出了一种模拟增材制造铝合金变形响应的计算方法。通过逐步填充的方法生成具有通过选择性激光熔化生产的铝合金典型的晶粒几何形状的三维显微组织。晶粒行为根据晶体塑性进行描述，并明确考虑滑移系统。一个现象学方程用于描述考虑到晶粒细胞-枝晶亚结构、晶界强化和应变硬化的临界解析剪应力。基于微结构的本构模型用于模拟准静态张力。为了降低计算成本，使用显式时间积分方案在动力学方面模拟准静态载荷，该方案为求解非线性问题提供了高数值效率。展示了沿三个不同方向承受拉力和剪切力的增材制造铝合金多晶模型的计算结果，以说明可能从微机械模拟中获得的结果。