Multiscale Evaluation of Mechanical Properties for Metal-Coated Lattice Structures
Multiscale Evaluation of Mechanical Properties for Metal-Coated Lattice Structures
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DOI：
10.1186/s10033-023-00912-7
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发表时间：
2023-09-12
影响因子：
4.2
通讯作者：
Chen, Min
中科院分区：
文献类型：
--
作者：
Wang, Lizhe;He, Liu;Chen, Min
结合3D打印和电镀技术，金属涂层树脂晶格是实现轻量化设计和理想响应的可行方法。然而，由于结构的高度复杂性，宏观晶格结构的力学分析需要很高的实验或数值成本。为了有效地研究这种结构的力学行为，本文提出了一种多尺度数值方法来研究金属包覆体心立方（BCC）晶格的有效性能。与同类研究中可以从单个单元模型中预测有效参数不同，本文注意到代表性体积元（RVE）的尺寸效应是严重的，并且只有包含多个单元的模型才能获得不敏感的预测。为此，本文确定了单个RVE的最小单元胞数。在此基础上，通过实验对比验证了该方法的有效性，并进行了参数化研究，以估计支撑直径和涂层厚度对结构响应的影响。结果表明，体积分数的增加可以显著提高材料的弹性模量和比模量。相反，涂层厚度的增加只导致弹性模量单调增加。因此，对于晶格结构的特定模量，应该有一个最佳的涂膜厚度。本工作为通过细观模型评价结构力学性能提供了一种有效的方法。
With the combination of 3D printing and electroplating technique, metal-coated resin lattice is a viable way to achieve lightweight design with desirable responses. However, due to high structural complexity, mechanical analysis of the macroscopic lattice structure demands high experimental or numerical costs. To efficiently investigate the mechanical behaviors of such structure, in this paper a multiscale numerical method is proposed to study the effective properties of the metal-coated Body-Centered-Cubic (BCC) lattices. Unlike studies of a similar kind in which the effective parameters can be predicted from a single unit cell model, it is noticed that the size effect of representative volume element (RVE) is severe and an insensitive prediction can be only obtained from models containing multiple-unit-cells. To this end, the paper determines the minimum number of unit cells in single RVE. Based on the proposed method that is validated through the experimental comparison, parametric studies are conducted to estimate the impact of strut diameter and coating film thickness on structural responses. It is shown that the increase of volume fraction may improve the elastic modulus and specific modulus remarkably. In contrast, the increase of thickness of coating film only leads to monotonously increased elastic modulus. For this reason, there should be an optimal coating film thickness for the specific modulus of the lattice structure. This work provides an effective method for evaluating structural mechanical properties via the mesoscopic model.