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Topology optimization considering the distortion in additive manufacturing

机译:考虑到加性制造中的失真的拓扑优化

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Additive manufacturing is a free-form manufacturing technique in which parts are built in a layer-by-layer manner. Laser powder bed fusion is one of the popular techniques used to fabricate metal parts. However, it induces residual stress and distortion during fabrication that adversely affects the mechanical properties and dimensional accuracy of the manufactured parts. Therefore, predicting and avoiding the residual stress and distortion are critical issues. In this study, we propose a topology optimization method that accounts for the distortion. First, we propose a computationally inexpensive analytical model for additive manufacturing that uses laser powder bed fusion and formulated an optimization problem. Next, we approximate the topological derivative of the objective function using an adjoint variable method that is then utilized to update the level set function via a time evolutionary reaction-diffusion equation. Finally, the validity and effectiveness of the proposed optimization method was established using two-dimensional design examples.
机译:添加剂制造是一种自由形式的制造技术,其中部分以逐层构建。激光粉床融合是用于制造金属部件的流行技术之一。然而,它在制造过程中诱导残余应力和变形,其不利地影响制造部件的机械性能和尺寸精度。因此,预测和避免残余应力和失真是关键问题。在这项研究中,我们提出了一种拓扑优化方法,其占失真。首先,我们提出了一种适用于使用激光粉床融合的添加剂制造的计算廉价的分析模型,并配制了优化问题。接下来,我们使用伴随变量方法近似物体函数的拓扑导数,然后利用时间通过时间进化反应扩散方程更新电平集功能。最后,使用二维设计示例建立了所提出的优化方法的有效性和有效性。

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