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The influence of strut waviness on the tensile response of lattice materials

Seiler, Philipp E., Li, Kan, Deshpande, Vikram S., Fleck, Norman A. (2021) The influence of strut waviness on the tensile response of lattice materials. Journal of Applied Mechanics, 88 (3). Article Number 031011. ISSN 0021-8936. E-ISSN 1528-9036. (doi:10.1115/1.4049140) (KAR id:89108)

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https://doi.org/10.1115/1.4049140

Abstract

Recent advances in additive manufacturing methods make it possible, for the first time, to manufacture complex micro-architectured solids that achieve desired stress versus strain re- sponses. Here, we report experimental measurements and associated finite element (FE) calcu- lations on the effect of strut shape upon the tensile response of two-dimensional (2D) lattices made from low-carbon steel sheets. Two lattice topologies are considered: (i) a stretching-dominated triangular lattice and (ii) a bending-dominated hexagonal lattice. It is found that strut waviness can enhance the ductility of each lattice, particularly for bending-dominated hexagonal lattices. Manufacturing imperfections such as undercuts have a small effect on the ductility of the lattices but can significantly reduce the ultimate tensile strength. FE simulations provide additional insight into these observations and are used to construct design maps to aid the design of lattices with specified strength and ductility.

Item Type: Article
DOI/Identification number: 10.1115/1.4049140
Uncontrolled keywords: lattice materials, ductile, tensile strength, wavy struts
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Philipp Seiler
Date Deposited: 09 Jul 2021 19:37 UTC
Last Modified: 09 Jul 2021 19:37 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/89108 (The current URI for this page, for reference purposes)
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