A novel hybrid design method of lattice structure based on failure mode

作     者：Chuanlei Li Junfeng Qi Panding Wang Zeang Zhao Zhe Wang Hongshuai Lei Shengyu Duan 

作者机构：Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and StructuresBeijing Institute of TechnologyBeijing 100081China State Key Laboratory of Explosion Science and TechnologyBeijing Institute of TechnologyBeijing 100081China Beijing SpacecraftsBeijing 100094China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2022年第65卷第9期

页      面：79-91页

核心收录：

学科分类：08[工学] 0801[工学-力学（可授工学、理学学位）] 080102[工学-固体力学] 0702[理学-物理学] 

基　　金：supported by the National Key Research and Development of China (Grant No. 2018YFA0702804) National Natural Science Foundation of China (Grant No. 12002031) China Postdoctoral Science Foundation(Grant Nos. BX2021038, and 2021M700428) Project of State Key Laboratory of Explosion Science and Technology。 

主　　题：additive manufacturing lattice structure shear deformation hybrid mechanical properties 

摘      要：Adjusting the mechanical properties of lattice structures is important for many modern application fields. In this paper, a new design method for hybrid multi-layer lattice structures was developed to improve the mechanical properties and energy absorption, by altering and suppressing the formation of the shear band. In these hybrids, all unit cells were divided into two parts:(i) diagonal unit cells and(ii) matrix unit cells. Four categories of unit cells were selected to construct the hybrid multi-layer structures. The compressive moduli, ultimate strengths, and energy absorption properties of the laser powder bed fusion(L-PBF)fabricated structures were assessed by experiments and finite element analysis(FEA). The results revealed the great impact of diagonal unit cells on the mechanical properties of the structures. Stronger diagonal unit cells than matrix unit cells led to hybrid structures with enhanced mechanical properties. Compared with a uniform body-centered cubic(BCC) lattice structure, the relative density of the lattice structure consisting of the weakest BCC matrix unit cells and strongest BFVC diagonal unit cells(coupling of BCC, FCC, and VC) exhibited an increase of 20%. The compressive modulus and ultimate strength of this structure rose by more than 200% and 90%, respectively. Two types of structures with specific properties were generated by hybrid design.The first displayed higher modulus, superior strength, and elevated specific energy absorption(SEA) but lower crash load efficiency(CLE). The second illustrated simultaneously higher SEA and elevated CLE. The present results provide a new insight for improving the load-bearing and energy absorption capacities of lattice structures.