Imperial College London
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DrEmilioMartinez-Paneda

Faculty of Engineering, Department of Civil and Environmental Engineering

Visiting Reader
 
 
 
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Contact

 

+44 (0)20 7594 8188e.martinez-paneda Website

 
 
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Location

 

249Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{del:2017:10.1016/j.engfracmech.2017.05.021,
author = {del, Busto S and Betegon, C and Martinez-Paneda, E},
doi = {10.1016/j.engfracmech.2017.05.021},
journal = {Engineering Fracture Mechanics},
pages = {210--226},
title = {A cohesive zone framework for environmentally assisted fatigue},
url = {http://dx.doi.org/10.1016/j.engfracmech.2017.05.021},
volume = {185},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - 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.
AU  - del,Busto S
AU  - Betegon,C
AU  - Martinez-Paneda,E
DO  - 10.1016/j.engfracmech.2017.05.021
EP  - 226
PY  - 2017///
SN  - 0013-7944
SP  - 210
TI  - A cohesive zone framework for environmentally assisted fatigue
T2  - Engineering Fracture Mechanics
UR  - http://dx.doi.org/10.1016/j.engfracmech.2017.05.021
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000415941400017&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/73443
VL  - 185
ER  -
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