Fracture toughness characteristics of additively manufactured Ti–6Al–4V lattices

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Fracture toughness characteristics of additively manufactured Ti–6Al–4V lattices
Title:
Fracture toughness characteristics of additively manufactured Ti–6Al–4V lattices
Journal Title:
European Journal of Mechanics / A Solids
Publication Date:
04 November 2020
Citation:
Stephen Daynes, Joseph Lifton, Wen Feng Lu, Jun Wei, Stefanie Feih, Fracture toughness characteristics of additively manufactured Ti–6Al–4V lattices, European Journal of Mechanics - A/Solids, Volume 86, 2021, 104170, ISSN 0997-7538, https://doi.org/10.1016/j.euromechsol.2020.104170.
Abstract:
Metallic lattice structures are well known for having high specific elastic moduli and strength. However, very little is understood about their resistance to fracture. In this work Ti-6Al-4V lattice structures are additively manufactured by selective laser melting and their fracture toughness characteristics are investigated. Resistance to fracture was determined under Mode-I loading at static rates using an extended compact tension (EC(T)) specimen, modified to contain lattice cells. The lattices consist of octet cells with a 3.5 mm edge length and relative densities ranging from 25% to 56%. Toughness is shown to increase by a power law with relative density and this trend was also obtained with finite element models. A new functional grading optimisation methodology is also presented for increasing fracture toughness. The size optimisation results in a functionally graded lattice whereby lattice truss diameters become the design variables. After size optimisation, initiation fracture toughness increases by up to 37%.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the Science and Engineering Research Council - Additive Manufacturing Centre (AMC)
Grant Reference no. : 142 6800088
Description:
ISSN:
0997-7538
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