Abstract
Cellular structures are regarded as excellent candidates for lightweight-design, load-bearing, and energy-absorbing applications. In this paper, a novel S-based TPMS hollow isotropic cellular structure is proposed with both superior load-bearing and energy-absorbing performances. The hollow cellular structure is designed with Boolean operation based on the Fischer-Koch (S) implicit triply periodic minimal surfaces (TPMS) with different level parameters. The anisotropy and effective elasticity properties of cellular structures are evaluated with the numerical homogenization method. The finite element method is further conducted to analyze the static mechanical performance of hollow cellular structure considering the size effect. The compression experiments are finally carried out to reveal the compression properties and energy-absorption characteristics. Numerical results of the Zener ratio proved that the S-based hollow cellular structure tends to be isotropic, even better than the sheet-based Gyroid TPMS. Compared with the solid counterpart, the S-based hollow cellular structure has a higher elastic modulus, better load-bearing and energy absorption characteristics.
Highlights
Cellular structures are an assembly of prismatic or polyhedral cells with solid edges [1,2]
We proposed an isotropic hollow cellular structure with both load-bearing and energy absorption properties
The results calculated by static Finite element analysis (FEA) and the numerical homogenization method are approximately the same level, which verifies the accuracy of the mechanical characterization for the cellular structures
Summary
Cellular structures are an assembly of prismatic or polyhedral cells with solid edges [1,2]. In the anti-impact field, cellular structures are generally designed with generative topology [14,15] and functionally graded distribution [16] to improve the pressure resistance and energy-absorption ability. It has been proved that cellular structures with negative Poisson’s ratio and graded distribution possess excellent buffer and energy-absorption properties under the impact [20]. Functionally graded cellular structures have been proved to have both load-bearing and energy-absorption capacity [20]. Isotropic cellular structures have uniform mechanical responses when subjected to external loads in any direction It can effectively ensure the safety of protected objects under the impact with highly uncertain directions and strength. How to enable the isotropic cellular structure with both load-bearing and energy-absorption characteristics is becoming a great challenge. We proposed an isotropic hollow cellular structure with both load-bearing and energy absorption properties. Mechanical compression experiments are carried out to reveal its compression and energy absorption characteristics
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