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Crack initiation and fracture toughness of random Voronoi honeycombs

Christodoulou, I; Tan, PJ; (2013) Crack initiation and fracture toughness of random Voronoi honeycombs. ENGINEERING FRACTURE MECHANICS , 104 140 - 161. 10.1016/j.engfracmech.2013.03.017. Green open access

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Abstract

The competing effects of cell-regularity and relative density upon the toughness of Voronoi honeycombs are investigated for different loading modes using finite elements. Mode I toughness is shown to be the more sensitive to microstructural variations than mode II although both retain a strong quadratic dependence upon relative density. Crack initiation is shown to occur at up to six cells from the crack-tip in regions of high localised strain and/or high strain gradient. The inclusion of T-stress dramatically changes the location of ligament fracture and the normalised effective toughness of a lattice. Ligament fracture is predominantly due to bending.

Type: Article
Title: Crack initiation and fracture toughness of random Voronoi honeycombs
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.engfracmech.2013.03.017
Publisher version: http://dx.doi.org/10.1016/j.engfracmech.2013.03.01...
Additional information: ©� 2013 Elsevier Ltd. All rights reserved. This work is licensed under a Creative Commons Attribution 3.0 Unported License.
Keywords: Fracture toughness, Voronoi, T-stress, Finite elements, Cellular solids, Mode-mixity
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1362717
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