Energy absorption characteristics of a novel CFCB lattice sandwich structure under out-of-plane compressive load
ZHAO Zhonghao1, CHI Yuli1,2, FENG Junliang3, WEN Dawei1, ZHU Guohua1
1.College of Automobile, Chang’an University, Xi’an 710064, China;
2.College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410006, China;
3.College of Chang’an-Dublin International Transportation, Chang’an University, Xi’an 710064, China
摘要点阵夹芯结构因其优异的力学性能、出色的能量吸收能力、独特的功能性，被广泛应用于航空航天、汽车、船舶等领域。然而，传统点阵夹芯结构在面外压缩载荷下存在应力分布不均匀、节点应力集中等缺点。为了解决上述问题，本研究基于体心立方结构（BCC）提出了一种新型的余弦函数单元基（Cosine function cell-base，CFCB）点阵结构。为了研究CFCB点阵夹芯结构面外压缩载荷下能量吸收特性，制备了CFCB点阵夹芯结构，开展了准静态压溃试验，并与BCC点阵夹芯结构的试验结果进行对比。结果表明，CFCB点阵夹芯结构面外压缩载荷下的承载与能量吸收能力明显优于BCC点阵夹芯结构。随后,基于有限元模型，系统揭示了芯子单胞直径、幅值、周期长度、厚度方向上的单胞层数等胞元参数对CFCB点阵夹芯结构面外压缩载荷下吸能特性的影响。相关研究成果有望为新型CFCB点阵夹芯结构设计提供参考。
Abstract：Lattice sandwich structures are widely used in aerospace, automotive and marine fields because of their excellent mechanical properties, outstanding energy absorption capability and unique functionality. While, traditional lattice materials have problems of uneven stress distribution and joint stress concentration. In order to solve the above problems, a new cosine function cell-base (CFCB) single-cell structure is proposed based on body-centered cubic structure (BCC). To study the energy absorption characteristics of CFCB lattice sandwich structure under out-of-plane compressive load, the CFCB lattice sandwich structure was prepared, and the quasi-static crushing test was carried out, and the test results were compared with those of BCC lattice sandwich structure. The results show that the load-bearing capacity and energy absorption capacity of CFCB lattice sandwich structure under out-of-plane compressive loading are obviously better than that of BCC lattice sandwich structure. Then, based on finite element model, the effects of cell parameters such as cell diameter, amplitude, period length and single cell layer number in the thickness direction of CFCB lattice sandwich structure on capacity absorption performance under out-of-plane compressive loading were simulation analyzed. The related research results are expected to provide a reference for the design of new lattice sandwich structures.
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