Hydride-induced embrittlement and fracture in metals - effects of stress and temperature distribution

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Hydride-induced embrittlement and fracture in metals - effects of stress and temperature distribution

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Publication Article, peer reviewed scientific
Title Hydride-induced embrittlement and fracture in metals - effects of stress and temperature distribution
Author(s) Varias, A G ; Massih, Ali R
Date 2002
English abstract
A mathematical model for the hydrogen embrittlement of hydride forming metals has been developed. The model takes into account the coupling of the operating physical processes, namely: (i) hydrogen diffusion, (ii) hydride precipitation, (iii) non-mechanical energy flow and (iv) hydride/solid-solution deformation. Material damage and crack growth are also simulated by using de-cohesion model, which takes into account the time variation of energy of de-cohesion, due to the time-dependent process of hydride precipitation. The bulk of the material, outside the de-cohesion layer, is assumed to behave elastically. The hydrogen embrittlement model has been implemented numerically into a finite element framework and tested successfully against experimental data and analytical solutions on hydrogen thermal transport (in: Wunderlich, W. (Ed.), Proceedings of the European Conference on Computational Mechanics, Munich, Germany, 1999, J. Nucl. Mater. (2000a) 279 (2–3) 273). The model has been used for the simulation of Zircaloy-2 hydrogen embrittlement and delayed hydride cracking initiation in (i) a boundary layer problem of a semi-infinite crack, under mode I loading and constant temperature, and (ii) a cracked plate, under tensile stress and temperature gradient. The initial and boundary conditions in case (ii) are those encountered in the fuel cladding of light water reactors, during operation. The effects of near-tip stress intensification as well as of temperature gradient on hydride precipitation and material damage have been studied. The numerical simulation predicts hydride precipitation at a small distance from the crack-tip. When the remote loading is sufficient, the near-tip hydrides fracture. Thus a microcrack is generated, which is separated from the main crack by a ductile ligament, in agreement with experimental observations
DOI http://dx.doi.org/10.1016/S0022-5096(01)00117-X (link to publisher's fulltext)
Publisher Elsevier Science Ltd.
Host/Issue Journal of the Mechanics and Physics of Solids;7
Volume 50
ISSN 0022-5096
Pages 1469-1510
Language eng (iso)
Subject(s) Chemo-mechanical processes
Cohesive zone
Crack propagation
Embrittlement
Hydrogen
Hydride
Handle http://hdl.handle.net/2043/1248 (link to this page)

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