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IRSN, Institut de radioprotection et de sûreté nucléaire

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Enhancing Nuclear Safety


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Computational non-smooth fracture dynamics in nonlinear and heterogeneous materials. Application to fracture of hydrided zircaloy


Congress title :SMIRT-18 International Conference on Structural Mechanics in Reactor Technology
Congress town :Pékin
Congress date:07/08/2005

Document type > *Congrès/colloque

Keywords >

Research Unit > IRSN/DPAM/SEMCA/LEC

Authors > DUBOIS Frédéric, MONERIE Yann, PERALES Frédéric, STAINIER Laurent

Publication Date > 12/08/2005

Summary

This paper presents a new computational method and the associated software dedicated to the study of the dynamic fracture of nonlinear and heterogeneous materials. This method is based on the concept of Frictional Cohesive Zone Model in the framework of Non-Smooth Contact Dynamics. The associated numerical platform, composed of three object-oriented libraries, allows to simulate, in three dimensional finite deformations, the dynamic fracture of both multiphase and functionally graded materials from crack initiation to post-fracture behavior. The ability of this software, developed by the French 'Institut de Radioprotection et de Sûreté Nucléaire' (IRSN)in the frame of its research program on nuclear fuel safety, is illustrated on the fracture of hydrided Zircaloy-4,constituting nuclear cladding tubes at high burnup, during a reactivity initiated accident (RIA). The macroscopic behavior of this heterogeneous material is deduced as an averaged energy release rate depending on the volume fraction of hydride phase.

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