Finite Element Analysis on Plastic Collapse Behavior of Topology-Optimized Cellular Structure Subject to Compressive Loading
Finite Element Analysis on Plastic Collapse Behavior of Topology-Optimized Cellular Structure Subject to Compressive Loading
复制标题
拓扑优化蜂窝结构受压载荷塑性破坏行为的有限元分析
DOI：
10.1115/imece2021-70744
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Tsuji Tomoaki
中科院分区：
文献类型：
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作者：
Takase Yuta;Kawano Takahiro;Kojima Tomohisa;Tsuji Tomoaki
细胞结构是细胞的集合体。它可以具有优异的性能，如重量轻，高刚度，和高能量吸收能力与人工制造的蜂窝结构。然而，尚未建立用于设计具有所需性质的蜂窝结构的准则。本研究旨在提供高能量吸收能力蜂窝结构的设计准则。以刚度最大化为目标函数，对单胞进行拓扑优化设计。采用有限元法对拓扑优化后的蜂窝结构和BCC、FCC点阵结构的压缩性能进行了分析。建立了完整模型和简化模型，其中减少了周期性边界条件下的单元数量。结果表明，采用简化模型可以显著降低分析成本。分析结果表明，优化结构和BCC、FCC点阵结构的电池支柱的变形模式不同。最后，对每种结构的比能量吸收和比强度进行了评价。与BCC和FCC晶格结构相比，优化后的形状具有更高的吸能能力和比强度。为了通过控制应力-应变关系来设计具有更大能量吸收能力的蜂窝结构，需要进一步研究拓扑优化的目标函数和边界条件。
The cellular structure is an assembly of cells. It may have excellent properties such as lightweight, high rigidity, and high energy absorption capacity with artificially manufactured cellular structure. However, guidelines for designing cellular structures with desired properties have not been established. This study aims to present the design guidelines for cellular structures with high energy absorption capacity. The unit cell was designed by topology optimization with the objective function of stiffness maximization. The compressive behaviors of the topology-optimized cellular structure and BCC, FCC lattice structures were investigated by carrying out the compression analysis by finite element method (FEM). A full model and a simplified model with a reduced number of cells with periodic boundary conditions were built for the analysis. It was confirmed that the use of the simplified model could significantly reduce the analysis cost. From the analysis results, it was shown that the deformation modes of the struts of the cell were different in optimized structure and BCC, FCC lattice structures. Finally, the specific energy absorption and the specific strength of each structure were evaluated. The optimized shape had high energy absorption capacity and specific strength compared with the BCC and FCC lattice structures. Further study is necessary to examine the objective function and boundary conditions in topology optimization to design cellular structures with larger energy absorption capacity by controlling the stress-strain relationships.