Topology optimization of CFRP hierarchical pyramidal structures fabricated by additive manufacturing
Topology optimization of CFRP hierarchical pyramidal structures fabricated by additive manufacturing
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DOI：
10.1016/j.compositesb.2021.109241
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发表时间：
2021-11
影响因子：
13.1
通讯作者：
Jingwei Zhang;J. Yanagimoto
中科院分区：
文献类型：
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作者：
Jingwei Zhang;J. Yanagimoto
将均匀化拓扑优化（HMTO）与弹性各向同性基本格相结合，在传统金字塔结构中引入最优结构层次，进一步提高结构效率.首先对典型的压杆桁架结构和闭孔板桁架结构的力学性能和弹性各向同性进行了分析，在此基础上对金字塔分级结构的等效面外压缩模量进行了理论分析，并与试验和数值计算结果进行了对比，系统地阐明了桁架结构拓扑结构对结构性能的影响。此外，表现出最佳的结构效率和弹性各向同性的基本晶格与HMTO集成，以优化面外压缩性能，包括刚度和能量吸收能力。与传统的金字塔结构和未优化的分层金字塔结构相比，具有最佳结构层次的分层金字塔结构的压缩模量分别提高了4.8%和28.2%。优化和未优化的金字塔结构的能量吸收能力分别比无结构层次的传统金字塔结构提高63.4%和27.2%。研究结果表明，将各向同性的SC-FCC板格与HMTO相结合，引入结构层次，可以有效地提高分级金字塔结构的结构效率。
The optimal structural hierarchy was introduced into the conventional pyramidal structure by integrating the homogenization-based topology optimization (HMTO) with elastically isotropic elementary lattices for further improvement of structural efficiency. The mechanical properties and elastic isotropy of representative truss–lattices composed of struts and plate–lattices consisting of closed-cell sheets were firstly evaluated, based on which the equivalent out-of-plane compression modulus of the hierarchical pyramidal structure was theoretically analysed and then compared with experimental and numerical results to systematically clarify the effects of lattice topology on the structural performance. Furthermore, the elementary lattice exhibiting the optimal structural efficiency and elastic isotropy was integrated with HMTO to optimize the out-of-plane compression properties including stiffness and energy absorption capability. The hierarchical pyramidal structure with optimal structural hierarchy achieves 4.8% and 28.2% higher compressive modulus over the conventional pyramidal structure and unoptimized hierarchical pyramidal structure, respectively. The energy absorption capability of optimized and unoptimized hierarchical pyramidal structures is 63.4% and 27.2% higher than that of conventional pyramidal structure without structural hierarchy, respectively. The results obtained from this study indicate that the structural hierarchy introduced via integration of isotropic SC–FCC plate–lattice with HMTO can effectively improve the structural efficiency of hierarchical pyramidal structures.