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Mechanical performances of metal-polymer sandwich structures with 3D-printed lattice cores subjected to bending load

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Abstract

In this article, we propose a new class of metal-polymer architected sandwich structures that exhibit different mechanical behaviors. These lightweight sandwich structures have been made of aluminum face sheets and 3D-printed lattice cores with 2D (Bi-grid, Tri-grid, Quadri-grid and Kagome-grid) and 3D (face-centered cubic-like and body-centered cubic-like) topologies. Finite element simulation and experimental tests were carried out to evaluate mechanical performances of the proposed sandwich structures under quasi-static three-point bending load. Specifically, the damage-tolerant capability, energy absorption and failure mechanisms of these sandwich structures were investigated and evaluated through a combination of analytical, numerical and experimental methods. It is found that sandwich structures with 3D face and body-centered cubic-like cores can provide more excellent flexural stiffness, strength and energy absorption performance. These enhanced mechanical features could be further explained by a so-called ‘Stress Propagation’ mechanism through finite element analysis (FEA) that can facilitate sandwich structures with 3D cores, especially body-centered cubic-like one, to transfer bending loads from central lattice units across neighboring ones more efficiently than 2D cores. Furthermore, core cracking is the main failure mode for the proposed sandwich structures, which is primarily caused and dominated by bending-induced tensile stress followed by shear stress. It is worth mentioning that our findings provide new insights into the design of novel lightweight sandwich composites with tailored mechanical properties, which can benefit a wide variety of high-performance applications.

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Acknowledgements

The authors would like to thank the Start-up Funds for Overseas High-Level Talents Plan from Wuhan University of Technology and the Fundamental Research Funds for the Central Universities (WUT: 2019-JD-B1-08 and 2020-JD-B1-16) for undertaking this work.

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Authors and Affiliations

  1. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Zhaobing Liu, Hantang Chen & Shuaiqi Xing

  2. Hubei Digital Manufacturing Key Laboratory, Wuhan University of Technology, Wuhan, 430070, China

    Zhaobing Liu

  3. Institute of Advanced Materials and Manufacturing Technology, Wuhan University of Technology, Wuhan, 430070, China

    Zhaobing Liu

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  1. Zhaobing Liu
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  2. Hantang Chen
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  3. Shuaiqi Xing
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Correspondence to Zhaobing Liu.

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Liu, Z., Chen, H. & Xing, S. Mechanical performances of metal-polymer sandwich structures with 3D-printed lattice cores subjected to bending load. Archiv.Civ.Mech.Eng 20, 89 (2020). https://doi.org/10.1007/s43452-020-00095-1

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  • DOI: https://doi.org/10.1007/s43452-020-00095-1

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