Mechanical behaviour of additively manufactured elastomeric pre-buckled honeycombs under quasi-static and impact loading

Adams, Rhosslyn; Townsend, Scott; Soe, Shwe; Theobald, Peter

Abstract

Selective laser sintering has been used to manufacture different structural variations of a pre-buckled circular honeycomb. The mechanical behaviour of these structures has been examined under both quasi-static and dynamic impact loading. Pre-buckled circular honeycombs with aspect ratios e = 0.8 and e = 0.6 were compared to a traditional, straight-walled honeycomb. It has been found that the mechanical behaviour of the honeycomb can be tailored to yield different mechanical responses. Principally, decreasing the aspect ratio reduced the stress at yield, as well as the total energy absorbed until densification, however, this alleviated the characteristic stress-softening response of traditional honeycombs under static and dynamic conditions. When subjected to multiple cycles of loading, a stabilised response was observed. The numerical response closely agreed with the experimental results. A simplified, periodic boundary condition model also closely agreed with the experimental results whilst alleviating computational run time by nominally 75%. The numerical full factorial parameter design sweep identified a broad range of mechanical behaviour. This represents a valuable tool to identify optimal design configurations for future impact mitigating applications.

• Journal Article Type: Article
• Acceptance Date: Dec 27, 2021
• Online Publication Date: Jan 3, 2022
• Publication Date: 2022-01
• Deposit Date: Jan 17, 2022
• Publicly Available Date: Jan 20, 2022
• Journal: Materials and Design
• Print ISSN: 0264-1275
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 213
• Article Number: 110368
• DOI: https://doi.org/10.1016/j.matdes.2021.110368
• Keywords: Mechanical Engineering; Mechanics of Materials; General Materials Science
• Public URL: https://uwe-repository.worktribe.com/output/8578492
• Additional Information: This article is maintained by: Elsevier; Article Title: Mechanical behaviour of additively manufactured elastomeric pre-buckled honeycombs under quasi-static and impact loading; Journal Title: Materials & Design; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.matdes.2021.110368; Content Type: article; Copyright: © 2022 The Authors. Published by Elsevier Ltd.