Title: Anti-tetrachiral auxetic structures fabricated by material extrusion: numerical and experimental investigation on influence of design parameters on mechanical properties under compressive loading

Authors: Soham Teraiya; Swapnil Vyavahare; Shailendra Kumar

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 article describes a numerical and experimental investigation on mechanical properties of anti-tetrachiral auxetic structures under compressive loading. The structures of acrylonitrile butadiene styrene material are fabricated by material extrusion technique of additive manufacturing. The influence of design parameters namely node radius and ligament thickness is studied on responses including strength, modulus and specific energy absorption (SEA) of in-plane and out-of-plane oriented structures. Experiments are planned using face-centred central composite design. From the experimental study, it is found that both design parameters significantly influence strength, modulus and SEA of structures. Also, it is observed that the stresses in plateau region of stress-strain curve remain almost constant till the densification phase during compressive loading of in-plane oriented structure, while the strength and modulus are high in out-of-plane oriented structure. Further, regression models for strength, modulus and SEA are developed, and optimisation of design parameters is performed to maximise the responses.

Keywords: mechanical properties; anti-tetrachiral auxetic structure; compressive loading; material extrusion; additive manufacturing; design parameters; strength; modulus.

DOI: 10.1504/IJMATEI.2024.137537

International Journal of Materials Engineering Innovation, 2024 Vol.15 No.1, pp.33 - 65

Received: 11 Mar 2022
Accepted: 16 Apr 2022
Published online: 25 Mar 2024 *

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