Description
We unveiled the damage evolution and failure mechanisms of metallic lattices fabricated with selective laser melting. Due to the manufacturing process, several deviations from the as-designed geometry appear, thereby leading to a major discrepancy between the theoretical and computational predictions of as-designed samples and the testing measurements of as-built samples. To understand the culprit, we developed probabilistic models (based on both homogenized schemes and full-scale simulations) that capture the location, morphology and distribution of defects in as-built samples. From these results, we can gauge the impact of manufacturing constraints on additively fabricated samples of alternative cell topology.
Relevant Publications
Liu L, Kamm P, GarcÃÂa-Moreno F, Banhart J, Pasini D, Elastic and failure response of imperfect three-dimensional metallic lattices: the role of geometric defects induced by Selective Laser Melting, Journal of the Mechanics and Physics of Solids, Vol 107, pp. 160-184, 2017.
El Elmi A, Melancon D, Asgari M, Pasini D, Experimental and numerical investigation of SLM induced defects in Ti-6Al-4V octet truss lattice material: the role of material microstructure and morphological variations, Journal of Materials Research – Focus Issue: Additive Manufacturing of Metals: Complex Microstructures and Architecture Design, 1-13, 2020