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General Presentation

par Alexandre MARTIN - publié le

The three main research operations of the laboratory are described below :

Damage and rupture of structures (metallic and civil engineering) :

  • Damage and ageing models : algorithms and formulations of global laws for structures, regularisation and internal variable gradient models. Application to metals, concretes and geo-materials ;
  • Rupture mechanics : link between global and local approaches of rupture, energy based methods, 3D simulation of multiple cracks, propagation-structure interaction in fatigue.

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Data identification, assimilation, exploitation, reduction and coupled problems involving structure :

  • Identification of aero-acoustic and thermo-hydraulic loadings for turbines and pipes : fluid-structure and soil-structure couplings ;
  • Identification of behaviour laws or parameters for in service structures : inverse models based on auscultation, geometric inverse problems, in service surveillance methods for structures. Prediction in service response following structural modifications.

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Computational mechanics : Methods, formulations and algorithms for non linear structural calculations :

  • Methods for the representation and propagation of material surfaces ;
  • Loading parametrization to monitor a 3D calculation ;
  • Error estimate and control of space-time discretisation ;
  • Coupling algorithms and multi-scale methods ;
  • Domain decomposition techniques.

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This thematic description of our activities gives its coherence to our laboratory : our main objective is an increased knowledge of ageing so as to ensure structural integrity during the lifetime of our structures. Lifetime duration being limited by rupture, our first research operation deals with damage and rupture processes.

This first research operation is also part of the thematic of the Fédération de Recherche Francilienne en Mécanique des Matériaux, Structures et Procédés (F2M2SP) and more precisely it participates to the workshop : Modelling of crack initiation and crack growth.

However, for real and long-term exploited structures, the knowledge of rupture mechanisms and associated models is not enough to make a correct prediction of remaining lifetime. One needs to know the physical state of the structure as well as the loadings it is submitted to. Moreover if modifications are made on the structures or on the loadings, one needs to forecast what would be the long term consequences. These issues need to be addressed by different tools amongst which inverse problem analyses and data assimilation. At last, the monitoring of in service installations leads to research fields linked to the definition of pertinent parameters for such monitoring, based on a physical interpretation of the behaviour of the components of the installation. These two themes define the core of the second research operation.

At last, these two research operations need to rely on efficient numerical simulation in order to exploit and use new models and methodologies applied to structural analysis. Old numerical methods may be questioned and new ones may be implemented requiring specific developments. Even if our numerical implementation does not concern exclusively Code_Aster free software, there is already an important legacy so that Code_Aster can be considered as one of our capitalisation and federation tool. As a consequence the coherence between the developments of the laboratory and the works of the development team of the software located in the AMA department of EDF R&D needs be ensured.

Finally, in a perspective of exploitation and integration of our results by the engineers, these three research operations are strongly coupled together.