Integration numerique de lois de comportement elastoviscoplastique endommageable et applications
Keywords:
elastoviscoplasticity, damage, creep rupture, modelling, finite element, semiimplicit algorithm, tangent stiffness matrixAbstract
Numerical simulation of creep rupture of a reactor pressure vessel in a severe hypothetical accident needs to perfectly take account of interactions between creep phenomena and damage. This paper presents a numerical method for solving constitutive equations of a material behaviour model coupling elastoviscoplasticity and creep damage through the effective stress concept. The numerical technique rests upon a semi-implicit time integration of the constitutive equations. The method is validated on both simple 1 D cases the results of which can be compared to other numerical or analytical solutions and in the case of an axisymmetric reference problem ( RUPTHER 4 test) under thermal and mechanical loading. The efficiency of different tangent stiffness matrices is analysed.
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