Non-local plasticity effects on notch fracture mechanics
File(s)
Accepted version
Author(s)
Martinez-Paneda, Emilio
del Busto, Susana
Betegon, Covadonga
Type
Journal Article
Abstract
We investigate the influence of gradient-enhanced dislocation hardening on the mechanics of notch-induced failure. The role of geometrically necessary dislocations (GNDs) in enhancing cracking is assessed by means of a mechanism-based strain gradient plasticity theory. Both stationary and propagating cracks from notch-like defects are investigated through the finite element method. A cohesive zone formulation incorporating monotonic and cyclic damage contributions is employed to address both loading conditions. Computations are performed for a very wide range of length scale parameters and numerous geometries are addressed, covering the main types of notches. Results reveal a strong influence of the plastic strain gradients in all the scenarios considered. Transitional combinations of notch angle, radius and length scale parameter are identified that establish the regimes of GNDs-relevance, laying the foundations for the rational application of gradient plasticity models in damage assessment of notched components.
Date Issued
2017-12-01
Date Acceptance
2017-09-25
Citation
Theoretical and Applied Fracture Mechanics, 2017, 92, pp.276-287
ISSN
0167-8442
Publisher
Elsevier
Start Page
276
End Page
287
Journal / Book Title
Theoretical and Applied Fracture Mechanics
Volume
92
Copyright Statement
© 2017 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000417774700027&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Engineering, Mechanical
Mechanics
Engineering
Strain gradient plasticity
Finite element analysis
Notch
Fracture
Fatigue
STRAIN GRADIENT PLASTICITY
FATIGUE-CRACK GROWTH
FINITE-ELEMENT
CONVENTIONAL THEORY
CRITERION
MODEL
Publication Status
Published
Date Publish Online
2017-09-28