An elasto-plastic fracture mechanics based model for assessment of hydride embrittlement in zircaloy cladding tubes

Karl-Fredrik, Nilsson; Jakšić, N.; Vokál, Vratko

doi:10.1016/j.jnucmat.2009.10.056

Cited by 12 publications

(2 citation statements)

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“…The material model is the neo‐Hookean hyperelastic model with J 2 plasticity. The two Lamé constants corresponding to the bulk and shear moduli for the small linear elasticity theory, the yield strength of Zircaloy‐4, and Voce's isotropic hardening function based on the uniaxial experiments for Zircaloy materials in the work of Nilsson et al are listed in Table . Finally, we define the interface parameters.…”

Section: Numerical Examplesmentioning

confidence: 99%

“…Figure presents an illustration of a quarter plane strain model for a fuel rod burst failure due to the expansion of fuel material under high temperature. The geometry data for the rod are obtained from the work of Nilsson et al The outer radius of the rod is 5.0305 mm, and the inner radius is 4.4165 mm. The wall thickness is 0.614 mm.…”

Section: Numerical Examplesmentioning

confidence: 99%

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An implicit discontinuous Galerkin finite element framework for modeling fracture failure of ductile materials undergoing finite plastic deformation

Liu

2018

Numerical Meth Engineering

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Summary It is a challenge to achieve a complete simulation of fracture failure in ductile materials undergoing large plastic deformation within implicit finite element frameworks due to instability issues. Currently, traditional nodal force or crack surface traction release methods target the direct release of tractions on cracked surfaces within the current time/load step. An abrupt change from a system without cracks to another system with cracks may contribute to the instability issues. Specifically, because of broken meshes, discontinuous Galerkin (DG) methods have an advantage over traditional continuous elements in naturally accommodating crack openings along DG interfaces across elements. To improve the convergence in nonlinear iterations during crack openings, we propose a relaxation scheme for DG formulations to gradually recover the traction‐free condition on cracked surfaces. Furthermore, this DG‐based relaxation scheme for crack openings in finite plastic media has been consistently formulated within the incomplete interior penalty DG framework. Finally, we have demonstrated a good performance of the proposed implicit DG formulation along with the DG relaxation scheme by successfully solving a nuclear fuel rod structural failure problem with multiple hydride crack openings and the Sandia Fracture Challenge benchmark.

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Section: Numerical Examplesmentioning

confidence: 99%

Section: Numerical Examplesmentioning

confidence: 99%