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Modeling of structural failure of Zircaloy claddings induced by multiple hydride cracks

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Abstract

Zirconium alloys have been serving as primary structural materials for nuclear fuel claddings. Structural failure analysis under extreme conditions is critical to the assessment of the performance and safety of nuclear fuel claddings. This work focuses on simulating structural failure of Zircaloy tubes with multiple hydride defects through modeling explicit crack propagation in ductile media. First, we developed an integrated cladding failure model by taking into account both crack initiation induced by hydride/matrix interface separation and ligament tearing-off between activated hydride cracks. Second, to accommodate the initiation, propagation, and coalescence of multiple cracks in finite plastic media we incorporated this structural failure model into a coupled continuous/discontinuous Galerkin (DG) based finite element code, a traditionally preferred implicit numerical framework. Third, to improve the adaptive placement of DG interface elements for crack propagation and to identify potential coalescence of cracks due to the interaction between adjacent hydride cracks, we defined a special failure index for the assessment of potential failure zones using both true plastic strain developed and predicted failure strain based on the Johnson–Cook material failure criterion. Finally, by calibrating the proposed material failure model using a cluster of Zircaloy material experimental tests, we successfully simulated a complete failure process of a fuel cladding tube with multiple hydride cracks.

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Acknowledgements

This research was supported by the new faculty startup fund at The University of Texas at San Antonio. Advice from and discussion with Dr. K. Ravi-Chandar are appreciated.

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  1. Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX, 78249, USA

    Ruijie Liu, Ahmed Mostafa & Zhijun Liu

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  1. Ruijie Liu
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Correspondence to Ruijie Liu.

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Liu, R., Mostafa, A. & Liu, Z. Modeling of structural failure of Zircaloy claddings induced by multiple hydride cracks. Int J Fract 213, 171–191 (2018). https://doi.org/10.1007/s10704-018-0312-9

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