Study on Mechanical Properties of Periodic Hierarchical Porous Composite Structures

本文以三维周期性点阵结构为对象，系统探究层级化设计对其冲击力学性能的调控规律。通过理论建模、数值仿真与实验验证相结合的方法，揭示了层级结构在面内与面外载荷下的变形机理与能量吸收特性。本研究构建了体心立方、面心立方和八面体三种结构的单层级与多层级周期性点阵构型，探索层级化设计对三维结构压溃行为的调控机制。研究发现，多层级设计有效提升了结构的稳定性、抗冲击能力和能量吸收水平，层级设计方案为开发新型高性能多孔复合结构提供了重要参考。This paper focuses on a three-dimensional periodic lattice structure as the object and systematically explores the regulatory laws of hierarchical design on its impact mechanical properties. Through the combination of theoretical modeling, numerical simulation and experimental verification, the deformation mechanism and energy absorption characteristics of the hierarchical structure under in-plane and out-of-plane loads are revealed. This study constructs single-level and multi-level periodic lattice configurations of body-centered cubic, face-centered cubic and octahedral structures, and explores the regulatory mechanism of hierarchical design on the collapse behavior of three-dimensional structures. The research finds that multi-level design effectively enhances the stability, impact resistance and energy absorption level of the structure. The hierarchical design scheme provides an important reference for the development of new high-performance porous composite structures.