Extensión del Marco VPSC–CODE_ASTER: Incorporación de Creep y Expansión Térmica en el Análisis Multiescala de Tubos de Zircaloy Irradiados
DOI:
https://doi.org/10.70567/mc.v42.ocsid8623Palavras-chave:
Anisotropía, Creep por irradiación, Creep térmico, Expansión térmica, Material policristalino, Análisis de elementos finitos, Code_Aster, VPSCResumo
Se presenta una extensión del marco multiescala VPSC–Code_Aster aplicada a tubos de Zircaloy-2. Se incorporan dos mecanismos térmicos clave: creep térmico y expansión térmica, formulados a nivel cristalográfico e integrados en el esquema autoconsistente. El modelo policristalino se acopla luego con Code_Aster mediante la interfaz CAFEM, habilitando el análisis multiescala con leyes de usuario. Los resultados preliminares muestran que el creep térmico presenta una marcada sensibilidad al estado tensional y, en el rango analizado, su efecto sobre la deformación plástica acumulada supera al de variaciones moderadas de temperatura. En cambio, la expansión térmica es puramente dependiente de la temperatura y se incorpora como una deformación libre de tensión en el esquema constitutivo. Este desarrollo constituye un paso hacia marcos predictivos más completos del comportamiento anisótropo de las aleaciones de circonio en servicio.
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