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Mechanical and failure behaviors of lattice-plate hybrid structures

Abstract

The authors design six alumina hybrid structures consisting of stretching-dominated plates and different space-filling lattices comprised of hollow tubes and perform finite element simulations to study mechanical and failure behaviors of such hybrid structures. The authors investigate the effects of three geometrical parameters on the stiffness and failure of these hybrid structures and further compare their advantages and disadvantages. The authors find that the failure modes of these hybrid structures can be tuned by altering cell unit type and geometrical parameters. Among these hybrid structures, the ones with effective support from the lattice unit cells in the stretching direction exhibit better specific stiffness and strength. By varying the lattice and plate thickness, the authors find that the relations between stiffness/failure strength and density follow a power law. When intrinsic material failure occurs, the power law exponent is 1; when buckling failure arises, the power law exponent is 3. However, by varying tube thickness, their relations follow unusual power relations with the exponent changing from nearly 0 to nearly infinity. In addition, the hybrid structures also exhibit defect insensitivity. This study shows that such hybrid structures are able to greatly expand the design space of architectured cellular materials for engineering applications.

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Acknowledgments

The support of this work by the Institute of High Performance Computing, A*STAR and use of computing resources at the A*STAR Computational Resource Centre and National Supercomputer Centre, Singapore, are gratefully acknowledged.

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Correspondence to Ping Liu.

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Liu, Z., Liu, P., Huang, W. et al. Mechanical and failure behaviors of lattice-plate hybrid structures. MRS Communications 10, 42–54 (2020). https://doi.org/10.1557/mrc.2019.153

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