Askes, H. and Susmel, L. (2014) Understanding cracked materials: is Linear Elastic Fracture Mechanics obsolete? Fatigue and Fracture of Engineering Materials and Structures, 38 (2). 154 - 160. ISSN 8756-758X
Abstract
Linear elastic fracture mechanics has enabled the research community to solve a wide variety of problems of practical and scientific interest; however, it has historically suffered from two main shortcomings. Firstly, it predicts physically unrealistic singular stresses and strains at crack tips. Secondly, microstructural effects are lacking, so that a major source of size-dependent behaviour is not captured. Gradient-enriched elasticity overcomes both these shortcomings: singularities are avoided, so that crack-tip stresses can be used to assess integrity, and the inclusion of microstructural terms implies that size effects can be captured. In this investigation, it is shown that gradient-enriched crack tip stresses can directly be used to model the transition from the short to the long crack regime. The accuracy of this approach was validated by a wide range of experimental results taken from the literature and generated under both static and high-cycle fatigue loading. This high level of accuracy was achieved without having to resort to phenomenological model parameters: the extra constitutive coefficient was simply the (average) grain size of the material.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Wiley Publishing Ltd. This is an author produced version of a paper subsequently published in Fatigue and Fracture of Engineering Materials and Structures. Uploaded in accordance with the publisher's self-archiving policy. This is the peer reviewed version of the following article: Askes and Susmel, 'Understanding cracked materials: is Linear Elastic Fracture Mechanics obsolete?', which has been published in final form at http://dx.doi.org/10.1111/ffe.12183. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving (http://olabout.wiley.com/WileyCDA/Section/id-820227.html#terms) |
Keywords: | gradient elasticity; grain size; length scale |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Civil and Structural Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 07 Oct 2015 14:53 |
Last Modified: | 16 Nov 2016 10:30 |
Published Version: | http://dx.doi.org/10.1111/ffe.12183 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1111/ffe.12183 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:85972 |