Abst'/> Modeling and simulation of large, conformal, porosity-graded and lightweight lattice structures made by additive manufacturing
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Modeling and simulation of large, conformal, porosity-graded and lightweight lattice structures made by additive manufacturing

机译:通过增材制造制造的大型,共形,孔隙度渐变和轻质晶格结构的建模和仿真

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AbstractThe emergence of additive manufacturing has enabled the design and manufacture of lightweight parts such as lattice structures with a complex geometry. However, conducting computer simulations to predict the mechanical behavior of such structures remains a challenge, especially when the number of struts is high. Firstly, this paper presents an approach to quickly build a lattice structure made of a large number of struts. The method takes advantage of the capabilities of finite element meshers to generate the tessellation of the volume into a series of tetrahedrons whose edges define the struts of the lattice. A graded-porosity can be defined during this process. Secondly, for the numerical simulation, the struts are modeled by beam finite elements. To adequately simulate the entire range of porosity, the material stiffness can be adjusted at any point of the structure, mainly to compensate for the lack of validity of stout beam elements. A numerical validation demonstrates the validity of the method by adequately predicting the displacement distribution of a mechanically loaded lattice structure, but an experimental validation raises issues related to the manufacturing limitations of small struts.HighlightsModeling of conformal lattice structures having a graded porosity using a finite element mesher.Simulation of lattice structures comprising a large number of struts.Introduction of the stiffness correction factor to simulate stout struts with beam elements.
机译: 摘要 增材制造的出现使设计和制造轻型零件(例如具有复杂几何形状的晶格结构)成为可能。然而,进行计算机模拟以预测这种结构的机械性能仍然是一个挑战,特别是当支撑杆的数量很高时。首先,本文提出了一种快速构建由大量支柱组成的晶格结构的方法。该方法利用了有限元网格的功能,将体积的镶嵌细分为一系列四面体,其边缘定义了晶格的支柱。可以在此过程中定义孔隙度。其次,对于数值模拟,通过梁有限元对支柱进行建模。为了充分模拟整个孔隙率范围,可以在结构的任何点调整材料刚度,主要是为了补偿粗壮梁单元缺乏有效性。数值验证通过充分预测机械加载的晶格结构的位移分布来证明该方法的有效性,但是实验验证提出了与小支柱的制造限制有关的问题。 突出显示 < ce:abstract-sec id =“ abssec0015” view =“ all”> 使用有限元网格划分具有多孔性的共形点阵结构的模型。< / ce:para> 包含大量s的晶格结构的模拟 将刚度校正系数引入

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