Imperial College London
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Professor Dan Balint

Faculty of Engineering, Department of Mechanical Engineering

Professor in Solid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 7084d.balint Website

 
 
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Location

 

519City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Reali:2022:10.1016/j.jmps.2022.104988,
author = {Reali, L and Balint, DS and Wenman, MR},
doi = {10.1016/j.jmps.2022.104988},
journal = {Journal of the Mechanics and Physics of Solids},
pages = {104988--104988},
title = {Dislocation modelling of the plastic relaxation and thermal ratchetting induced by zirconium hydride precipitation},
url = {http://dx.doi.org/10.1016/j.jmps.2022.104988},
volume = {167},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The precipitation of hydrides in zirconium alloys is accompanied by a significant and anisotropic volumetric expansion. Previous literature quantified the misfit both theoretically and experimentally, but these values differ greatly; the experimental values are consistently lower. One possibility is that the experimental measurements include the effect of dislocations generated by the hydride, which relax the transformation stresses. To test this hypothesis, it is important to determine the stress field of a hydride and its associated dislocations, combined. A simple planar dislocation model was developed of the hydride—dislocation ensemble in -Zr. By capturing details of the dislocation structures given in the literature, it is shown in this study that including the interfacial dislocations largely reconciles the predicted and experimental values. Discrete dislocation plasticity is then used to model the diffuse plastic relaxation associated with hydride formation. The effects of plastic relaxation on the equilibrium hydrogen profile, hence the implications for subsequent hydride precipitation, are discussed. In particular, precipitation–dissolution cycles were simulated to calculate the magnitude of the residual hydrostatic tension, which is argued to be the primary cause of the “memory effect” for the re-precipitation of both  and  hydrides.
AU  - Reali,L
AU  - Balint,DS
AU  - Wenman,MR
DO  - 10.1016/j.jmps.2022.104988
EP  - 104988
PY  - 2022///
SN  - 0022-5096
SP  - 104988
TI  - Dislocation modelling of the plastic relaxation and thermal ratchetting induced by zirconium hydride precipitation
T2  - Journal of the Mechanics and Physics of Solids
UR  - http://dx.doi.org/10.1016/j.jmps.2022.104988
UR  - https://www.sciencedirect.com/science/article/pii/S002250962200179X?via%3Dihub
UR  - http://hdl.handle.net/10044/1/97939
VL  - 167
ER  -
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