Mechanical Behavior of Hybrid Lattices Composed of Elastic and Elastoplastic Struts
Publication: Journal of Engineering Mechanics
Volume 146, Issue 2
Abstract
The mechanical behavior of cellular solids has been extensively studied in the literature. Nevertheless, possible structural effects of inhomogeneities in the form of elastoplastic struts have not yet been investigated. We present a numerical analysis of the tensile behavior of triangular, diamond, and hexagonal hybrid lattices composed of both elastic and elastoplastic struts. In particular, some struts are assumed to behave as strain-hardening elastoplastic beams while others are assumed to behave as a linear elastic material. It is found that both the stiffness and the strength of the lattices decrease with increasing percentage of elastoplastic struts. Furthermore, the presence of elastoplastic struts markedly alters fracture toughness. The effect of relative density on the tensile behavior of hybrid lattices is also investigated. It is concluded that in addition to the microstructure of cellular solids, the constitutive behavior of individual struts significantly affects their macroscopic mechanical response. Thus, the spatial distribution of struts with different material properties can be considered a novel approach in the design of cellular solids with desired properties.
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Acknowledgments
The authors would like to acknowledge the partial support of the National Science Foundation (Grant No. 1351461).
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©2019 American Society of Civil Engineers.
History
Received: Sep 26, 2018
Accepted: Apr 29, 2019
Published online: Dec 3, 2019
Published in print: Feb 1, 2020
Discussion open until: May 3, 2020
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