CUED Publications database

The Influence of Strut Waviness on the Tensile Response of Lattice Materials

Seiler, PE and Li, K and Deshpande, VS and Fleck, NA (2021) The Influence of Strut Waviness on the Tensile Response of Lattice Materials. Journal of Applied Mechanics, Transactions ASME, 88. ISSN 0021-8936

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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 responses. Here, we report experimental measurements and associated finite element (FE) calculations 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
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 27 Nov 2020 20:18
Last Modified: 13 Apr 2021 10:14
DOI: 10.1115/1.4049140