Multiscale Impact Mechanics of Additively Manufactured Periodic Cellular Solids

Cellular materials have superior weight-specific properties, including energy absorption (EA) capabilities, as compared to solid, monolithic materials. Regular periodic lattices, a subset of cellular materials, are of increasing interest for their repeatable and customizable behavior, particularly when paired with advanced manufacturing techniques – such as additive manufacturing – which can fabricate these geometrically complex materials. This thesis analyzed these materials numerically and experimentally: multiple topologies were comprehensively investigated to understand how characteristics including strut alignment and relative density influence their performance, finding the presence of struts aligned in the impact direction led to lower EA efficiencies; the influence of shape transformers on the performance of stretching- and bending-dominated lattices was investigated, finding it possible to improve their EA performance by changing the strut cross-section shape; experiments with nylon carbon fiber lattices and resin lattices solidified earlier conclusions and suggested unique multi-layer, multi-topology lattice designs could improve EA performance.

Name thesis:degree_name

Master of Applied Science (M.App.Sc.)

Level thesis:degree_level

Master's

Discipline thesis:degree_discipline

Engineering, Aerospace

Grantor dc:publisher

Carleton University

Year dc:date.issued

2023

Author dc:creator

• Bernard, Autumn Rae

Statement dc:rights

• Copyright © 2023 the author(s). Theses may be used for non-commercial research, educational, or related academic purposes only. Such uses include personal study, distribution to students, research and scholarship. Theses may only be shared by linking to the Carleton University Institutional Repository and no part may be copied without proper attribution to the author; no part may be used for commercial purposes directly or indirectly via a for-profit platform; no adaptation or derivative works are permitted without consent from the copyright owner.

Language dc:language.iso

en

DOI

10.22215/etd/2023-15930

OAI identifier oai:identifier

oai:carleton.scholaris.ca:20.500.14718/41777