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A numerical study of crack shielding and deflection under extensive plasticity

A numerical study of crack shielding and deflection under extensive plasticity
A numerical study of crack shielding and deflection under extensive plasticity
Experimentally observed crack deflection events in multi-layered material systems, occurring even under pure mode-I loading, are here simulated and explained through elasto-plastic finite element modelling. The crack tip opening displacement is adopted as the crack driving force and estimated along crack paths whose deflection is predicted using the maximum tangential strain criterion. Shielding conditions that promote deflection and bifurcation are evaluated. It is shown that, under conditions of extended plasticity, CTOD evolution as a crack approaches an interface can reveal crack shielding and amplification, and that crack deflection and growth can be assessed from the variation of tangential strains around the crack tip.
multi-layered systems, crack deflection, crack path bifurcation, crack growth, plasticity, finite element analysis
0013-7944
1345-1356
Burke-Veliz, Allan
f5aa48c4-0bdc-4c2d-ab01-a71a1348e526
Reed, Philippa A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Syngellakis, Stavros
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88
Burke-Veliz, Allan
f5aa48c4-0bdc-4c2d-ab01-a71a1348e526
Reed, Philippa A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Syngellakis, Stavros
1279f4e2-97ec-44dc-b4c2-28f5ac9c2f88

Burke-Veliz, Allan, Reed, Philippa A.S. and Syngellakis, Stavros (2009) A numerical study of crack shielding and deflection under extensive plasticity. Engineering Fracture Mechanics, 76 (9), 1345-1356. (doi:10.1016/j.engfracmech.2009.02.003).

Record type: Article

Abstract

Experimentally observed crack deflection events in multi-layered material systems, occurring even under pure mode-I loading, are here simulated and explained through elasto-plastic finite element modelling. The crack tip opening displacement is adopted as the crack driving force and estimated along crack paths whose deflection is predicted using the maximum tangential strain criterion. Shielding conditions that promote deflection and bifurcation are evaluated. It is shown that, under conditions of extended plasticity, CTOD evolution as a crack approaches an interface can reveal crack shielding and amplification, and that crack deflection and growth can be assessed from the variation of tangential strains around the crack tip.

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More information

Published date: June 2009
Keywords: multi-layered systems, crack deflection, crack path bifurcation, crack growth, plasticity, finite element analysis
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 66387
URI: https://eprints.soton.ac.uk/id/eprint/66387
ISSN: 0013-7944
PURE UUID: 3499ed28-31b8-49ce-b4bf-6328aa90e5b0
ORCID for Philippa A.S. Reed: ORCID iD orcid.org/0000-0002-2258-0347

Catalogue record

Date deposited: 10 Jun 2009
Last modified: 20 Jul 2019 01:21

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