A Novel Lattice Structure for Enhanced Crush Energy Absorption


Seek, Chang Yuan and Kok, Chee Kuang and Lim, Chong Hooi and Liew, Kia Wai (2022) A Novel Lattice Structure for Enhanced Crush Energy Absorption. International Journal of Technology, 13 (5). p. 1139. ISSN 2086-9614

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Lightweight and stiff lattice structures are good energy absorbers. This study evaluates the energy absorption capacity of a few common lattice structures printed out of PLA using fused deposition modeling and proposes an improved lattice structure. Simple cubic (SC), honeycomb (HC), body-centered cubic (BCC), and novel PeckGy80 (PG80) lattice structures were subjected to compressive tests. The quasi-static load-displacement behavior of lattice specimens was characterized in terms of specific energy absorption and crush load efficiency. The damage mechanisms were then related to energy absorption. Cracks and brittle fractures occurred in all lattice structures during the crush test. Different lattice structures induced different damage mechanisms, significantly affecting their energy absorption. SC lattice structure showed structural separation at a small displacement, rendering it an ineffective energy absorber. BCC and HC lattice structures demonstrated almost identical shear band failure modes. The PG80 lattice structure, although made of brittle PLA, displayed progressive failure from the bottom layer to the upper layers, exhibiting both a high peak load and stable post-yield behaviour. This damage mode enabled the PG80 lattice to be far superior in terms of specific energy absorption to HC, SC, and BCC lattice structures.

Item Type: Article
Uncontrolled Keywords: 3D Printing, Energy absorption, Lattice structures, PLA, Quasi-static crush
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics
Divisions: Faculty of Engineering and Technology (FET)
Depositing User: Ms Nurul Iqtiani Ahmad
Date Deposited: 31 Oct 2022 03:37
Last Modified: 31 Oct 2022 03:37
URII: http://shdl.mmu.edu.my/id/eprint/10566


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