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.
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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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