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Dislocation-based fracture mechanics within nonlocal and gradient elasticity of bi-Helmholtz type - Part II: Inplane analysis
Aalto University, Finland.ORCID iD: 0000-0001-8515-9907
2016 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, 105-120 p.Article in journal (Refereed) Published
Abstract [en]

Abstract This paper is the sequel of a companion Part I paper devoted to dislocation-based antiplane fracture mechanics within nonlocal and gradient elasticity of bi-Helmholtz type. In the present paper, the inplane analysis is carried out to study cracks of Modes I and II. Generalized continua including nonlocal elasticity of bi-Helmholtz type and gradient elasticity of bi-Helmholtz type (second strain gradient elasticity) offer nonsingular frameworks for the discrete dislocations. Consequently, the dislocation-based fracture mechanics within these frameworks is expected to result in a regularized fracture theory. By distributing the (climb and glide) edge dislocations, (Modes I and II) cracks are modeled. Distinctive features are captured for crack solutions within second-grade theories (nonlocal and gradient elasticity of bi-Helmholtz type) comparing with solutions within first-grade theories (nonlocal and gradient elasticity of Helmholtz type) as well as classical elasticity. Other than the total stress tensor, all of the field quantities are regularized within second-grade theories, while first-grade theories give singular double stress and dislocation density and classical elasticity leads to singularity in the stress field and dislocation density. Similar to gradient elasticity of Helmholtz type (first strain gradient elasticity), crack tip plasticity is captured in gradient elasticity of bi-Helmholtz type without any assumption of the cohesive zone. ", keywords = Crack; Inplane; Dislocation; Nonlocal elasticity of bi-Helmholtz type; Gradient elasticity of bi-Helmholtz type; Nonsingular, isbn = 0020-7683, doi=https://doi.org/10.1016/j.ijsolstr.2016.03.025

Place, publisher, year, edition, pages
Elsevier, 2016. 105-120 p.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kau:diva-65030DOI: 10.1016/j.ijsolstr.2016.03.025ISI: 000378468600010OAI: oai:DiVA.org:kau-65030DiVA: diva2:1154126
Available from: 2017-11-01 Created: 2017-11-01 Last updated: 2017-12-07Bibliographically approved

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Mousavi, S. Mahmoud
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