Mechanical and failure behaviors of lattice-plate hybrid structures
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Prospective Article
Mechanical and failure behaviors of lattice–plate hybrid structures Zhigang Liu and Ping Liu, Institute of High Performance Computing, A*STAR, Singapore 138632, Singapore Wei Huang, School of Aeronautics, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, People’s Republic of China Wei Hin Wong, Athanasius Louis Commillus, and Yong-Wei Zhang, Institute of High Performance Computing, A*STAR, Singapore 138632, Singapore Address all correspondence to Ping Liu at [email protected] (Received 29 June 2019; accepted 20 November 2019)
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.
Introduction Design and fabrication of materials with ultralow density as well as ultrahigh stiffness and strength have always been the pursuit of mankind since these materials are capable of meeting mechanically demanding applications. Cellular architectures with the spatial distribution of voids and solids have been regarded as a viable route to achieve these desirable properties. These cellular materials with tunable internal architectures enable a greater space in the material and structure design and thus are able to achieve a superior structural efficiency.[1–14] By varying geometry or cell distribution locally within such materials, their mechanical properties can even be tuned to meet specific requirements. Materials with the sophisticated cellular architecture were often limited by fabrication processes in the past. Recently, the emergence of additive manufacturing or other novel precision fabrication technologies enables manufacturing of micro-/nanoarchitectured materials with more complicated inner structures, and as a result, many novel architectured materials have been made ov
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