Objectives

As illustrated by the different actions carried out or underway , the group "Fatigue of Materials and Structures" has acquired a certain expertise in the field of material fatigue (eg, metals, metastable materials, elastomers, composites, ...). For years, our team will maintain its general approach based on the three "theoretical approach - An experimental approach - Numerical approach" and our work will acccent on the "effect of the breeding process on fatigue properties of materials and structures "with the ambition to gain visibility both nationally and internationally. This scientific question, which concerns the taking into account the initial state resulting from the non-standard method for obtaining the fatigue properties is essential for several reasons. From the academic point of view, it is difficult scientific locks both in terms of identification of the experimental and theoretical modeling. From the industrial point of view, it is a crosscutting issue that affects all sectors of activities (eg, naval, offshore, automotive, energy, health, rail ...), and opens a field of optimization of critical products .

The scientific future for the group "Fatigue of Materials and Structures" are synthesized in large areas:

Effect of the method of the fatigue properties

In this theme the challenges are, firstly, to develop experimental strategies based on measures of self-heating applied to heterogeneous situations (eg, components, assemblies, ...) and secondly, to propose methods for ad hoc analysis to extract the fatigue properties at high cycle. This theme will need to continue and increase our development of experimental strategies based on the use of field measurements (especially heat). Is given in the following list of various projects on this theme:

1. ( David Thévenet , Crécric Doudard, Sylvain Calloch). Weldments Submarine (David Thevenet, Crécric Doudard, Sylvain Calloch). Partners: DCN, DGA. Thesis Sarah Plessis, 2010-2013.
2. ( Yann Marco , Sylvain Calloch). Thermoplastic composite parts bundles (Yann Marco Sylvain Calloch). Partners: Trelleborg, PSA, Rhodia Promold. (Project FUI current expertise).
3. ( Yann Marco , Sylvain Calloch). Elastomer parts (Yann Marco Sylvain Calloch). Partners: Trelleborg LimatB, ECN, LRCCP. ANR proFem 2011-2014. Post-Doc Vincent Le Saux (2011) and PhD starting in September 2011.
4. ( Cédric Doudard , Stéphane Sire, Sylvain Calloch). Surface treatments on metal parts (Cedric Doudard, Stéphane Sire, Sylvain Calloch). Partners: DCN, DGA.

Self-heating under cyclic loading and fatigue properties

In this theme, the actions are mainly directed towards the implementation of the process of self-heating under cyclic loading on other materials (ie, not studied until now). The experimental strategies and analysis models should be developed and validated. Is given in the following list of different cases:

1. ( Sylvain Calloch , Cédric Doudard, Yann Marco, Shabnam Arbab Chirani, Stéphane Sire) Justification of activation scenarios dissipative mechanisms (Sylvain Calloch, Cedric Doudard, Yann Marco, Shabnam Arbab Chiran, Stéphane Sire)
2. ( Shabnam Arbab Chirani , Sylvain Calloch) Case of shape memory alloys (Shabnam Arbab Chiran, Sylvain Calloch)
3. ( Yann Marco , Sylvain Calloch) Case of organic materials (Yann Marco Sylvain Calloch)
4. ( Sylvain Calloch , Cédric Doudard, Yann Marco, Shabnam Arbab Chirani, Laurent Pino) Case of multiaxial loading (Sylvain Calloch, Cedric Doudard, Yann Marco, Shabnam Arbab Chiran, Laurent Pino)
5. ( eg , fer puddlé) ( Stephane Sire , Cédric Doudard, Sylvain Calloch) Cases of ancient metals (eg, wrought iron) (Stephane Sire, Cedric Doudard, Sylvain Calloch)

Adaptive materials and metastable

Our work on adaptive and metastable materials will continue. Emphasis will be placed on the one hand, the study of fatigue of these materials and, secondly, the modeling of thermomechanical behavior and especially under multiaxial stresses. Different materials will be studied (eg, stainless steels iTRIP). Furthermore, we will strive to strengthen our links with industry and develop international academic collaborations. In the following, we give the list of actions related to this topic:

1. ( Shabnam Arbab Chirani , Sylvain Calloch, Laurent Pino). Multiaxial cyclic thermomechanical tests (Shabnam Arbab Chiran, Sylvain Calloch, Laurent Pino). Partners: LIMaTB, IRMAR, SCR. EFA project M3COTAM (UEB).
2. ( Shabnam Arbab Chirani , Sylvain Calloch). Developing models of cyclical behavior-based approaches or macroscopic transition scales (Shabnam Arbab Chiran, Sylvain Calloch). Partners: LIMaTB, IRMAR, SCR. EFA project M3COTAM (UEB).
3. ( Shabnam Arbab Chirani , Sylvain Calloch, Laurent Pino). Effect of the method of the fatigue properties (Shabnam Arbab Chiran, Sylvain Calloch, Laurent Pino). Partner: Micro-Mega.