A cohesive zone framework for environmentally assisted fatigue
File(s)1711.09965v1.pdf (2.18 MB)
Accepted version
Author(s)
Del Busto, S
Betegon, C
Martinez-Paneda, E
Type
Journal Article
Abstract
We present a compelling finite element framework to model hydrogen assisted fatigue by means of a hydrogen- and cycle-dependent cohesive zone formulation. The model builds upon: (i) appropriate environmental boundary conditions, (ii) a coupled mechanical and hydrogen diffusion response, driven by chemical potential gradients, (iii) a mechanical behavior characterized by finite deformation J2 plasticity, (iv) a phenomenological trapping model, (v) an irreversible cohesive zone formulation for fatigue, grounded on continuum damage mechanics, and (vi) a traction-separation law dependent on hydrogen coverage calculated from first principles. The computations show that the present scheme appropriately captures the main experimental trends; namely, the sensitivity of fatigue crack growth rates to the loading frequency and the environment. The role of yield strength, work hardening, and constraint conditions in enhancing crack growth rates as a function of the frequency is thoroughly investigated. The results reveal the need to incorporate additional sources of stress elevation, such as gradient-enhanced dislocation hardening, to attain a quantitative agreement with the experiments.
Date Issued
2017-11-01
Online Publication Date
2019-09-19T08:11:35Z
Date Acceptance
2017-05-16
ISSN
0013-7944
Publisher
Elsevier
Start Page
210
End Page
226
Journal / Book Title
Engineering Fracture Mechanics
Volume
185
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:000415941400017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Mechanics
Hydrogen embrittlement
Cohesive zone models
Hydrogen diffusion
Finite element analysis
Fatigue crack growth
STRAIN GRADIENT PLASTICITY
CRACK-PROPAGATION
HYDROGEN DIFFUSION
FINITE-ELEMENT
STRENGTH
FRACTURE
GROWTH
NUCLEATION
TRANSPORT
Science & Technology
Technology
Mechanics
Hydrogen embrittlement
Cohesive zone models
Hydrogen diffusion
Finite element analysis
Fatigue crack growth
STRAIN GRADIENT PLASTICITY
CRACK-PROPAGATION
HYDROGEN DIFFUSION
FINITE-ELEMENT
STRENGTH
FRACTURE
GROWTH
NUCLEATION
TRANSPORT
cond-mat.mtrl-sci
cond-mat.mtrl-sci
Mechanical Engineering & Transports
Publication Status
Published
Country
Gijon, SPAIN
Date Publish Online
2017-05-27