Title: Experimental investigation on mechanical properties of FDM fabricated hexachiral auxetic structure under compressive loading

Authors: Shailendra Kumar; Soham Teraiya; Rushikesh Badhe

Addresses: Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat-395007, India ' Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat-395007, India ' Department of Mechanical Engineering, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat-395007, India

Abstract: The present paper describes an experimental investigation on mechanical properties of hexachiral auxetic structure under compressive loading. Structures of polylactic acid (PLA) are fabricated using fused deposition modelling (FDM) technique of additive manufacturing (AM). Influence of two geometric parameters namely node radius and ligament thickness on compressive strength, compressive modulus, plateau strength and specific energy absorption (SEA) of hexachiral structures is studied. It is found that modulus is significantly influenced by both geometric parameters. For compressive strength, plateau strength and SEA, only node radius is found to be a significant parameter. All compressive properties increase with decrease in node radius and ligament thickness. Regression models are also developed to predict compressive properties of structure. To maximise the responses, optimisation of geometric parameters is performed.

Keywords: mechanical properties; hexachiral; auxetic; structure; compression; fused deposition modelling; additive manufacturing.

DOI: 10.1504/IJMATEI.2024.138602

International Journal of Materials Engineering Innovation, 2024 Vol.15 No.2, pp.99 - 112

Received: 19 Jul 2022
Accepted: 23 Aug 2022
Published online: 15 May 2024 *

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