Topology Optimization of Periodic Lattice Structure with High Shear Strength Using Energy-based Homogenization

doi:10.3901/JME.2017.18.152

Abstract

Abstract: The topology configuration of traditional porous structure is single, lack of scientific design method for guidance. In order to design periodic lattice structure with high shear strength. The optimization model of micro-cellular materials based on the properties of macrostructures which focused on the periodic base cell for finding a micro-structural topology with the maximum shear modulus under a prescribed volume and mechanic constraint is built based on topology optimization technique. By solving the model on modified optimal algorithm, the mechanical equivalent properties are deduced according to the optimized result, the characterization of shear performance with respect to microstructural geometrical parameters is obtained by considering the transverse shear deformation and the flexibility of the cell wall. Finally, the obtained lattice structure is manufactured, and then the shear properties are tested, it can be concluded that the measured shear modulus of the lattice structure is higher than those of hexagonal honeycomb structures, which demonstrates the excellence shearing performance of the periodic lattice structure. Results show that the proposed method can be effectively applied to the design of periodic lattice structure with great shear performance.

Key words: energy-based homogenization method, high shear strength, lattice structure, topology optimization

CLC Number:

TH11

DU Yixian, LI Hanzhao, TIAN Qihua, YIN Yifeng, LUO Zhen. Topology Optimization of Periodic Lattice Structure with High Shear Strength Using Energy-based Homogenization[J]. Journal of Mechanical Engineering, 2017, 53(18): 152-160.

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