[NotiAMCA] Anuncio de beca doctoral

[Martin Ignacio Idiart]

Agradecería la posibilidad de difundir este anuncio de beca doctoral en
la próxima edición de Notiamca. 

BECA DOCTORAL | BÚSQUEDA DE CANDIDATOS A BECA DOCTORAL 

Búsqueda de candidatos para Beca Doctoral, en el marco de un proyecto de
investigación en micromecánica de sólidos. 

TEMA: _Modelado micromecánico de la respuesta viscoplástica de un
policristal: aplicación al endurecimiento de un acero irradiado._ 

CUERPO DIRECTOR: Dr. Ing. Mihail Garajeu, Dr. Ing. Martín I. Idiart, Dr.
Ing. Pierre-Guy Vincent. 

LUGAR DE TRABAJO: Laboratorio de Mecánica y Acústica del CNRS (Marsella,
Francia) e Instituto de Radioprotección y Seguridad Nuclear de Francia
(Cadarache, Francia), y estadías en el Departamento de Aeronáutica de la
Facultad de Ingeniería, Universidad Nacional de La Plata. 

This thesis is part of the research carried out at the French "Institut
de Radioprotection et de Sûreté Nucléaire" (IRSN) on the ageing of
vessel steels in pressurized water reactors. Many microstructural
changes occur in these steels due to irradiation. These changes are the
key to understand and predict the modification of their viscoplastic
responses (including hardening) and their rupture properties with
irradiation. In this context, the objective of this work is to propose a
new model of plastic behavior at the polycrystal scale, using a
crystalline plastic behavior law adapted to an irradiated vessel steel.
>From the applied point of view, the objective is to propose a behavior
model that could be directly implemented into a finite element
calculation code, in order to estimate the stress and strain fields
during the simulation of a C(T) test (in place of a J2-type model
usually used). Many mean-fields homogenization models have been proposed
in the literature for the viscoplasticity of polycrystals. For
irradiated vessel steels, in view of the recently developed crystalline
laws, strong heterogeneities are expected between the different grains
of the polycrystal in terms of strains and stresses during mechanical
loading. These heterogeneities are associated with increasingly
anisotropic grains during loading (different evolutions of critical
resolved shear stresses in the grains according to the different sliding
systems). With respect to homogenization, this is the non-linearity of
the local behavior (grain behavior) associated with the non-uniformity
of mechanical fields that makes the complexity of the problem to be
treated. The scientific problem of this thesis topic consists in
evaluating the relevance of a recent homogenization model in the case of
polycrystals in highly anisotropic viscoplasticity (anisotropy of grain
behavior). 

REQUISITOS: Poseer título en ingeniería o ciencias convexas equivalente
al grado de Magister de una universidad de Francia. Buen dominio del
idioma inglés y algunos conocimientos del idioma francés. Fuerte interés
en mecánica de sólidos, métodos matemáticos y programación. 

CONTACTO:
Dr. Ing. Martín I. Idiart ( martin.idiart en ing.unlp.edu.ar ).
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