ENSTA Bretagne : Recherche en mécanique

PTR5: Material behavior and durability

The research work conducted at the Institut de Recherche Dupuy de Lôme (IRDL, UMR CNRS 6027) focuses on assessing, measuring, modeling and predicting the soundness of materials, structures and electromagnetic systems.

Research focus

  • Nonlinear behavior of heterogeneous materials
  • Fatigue and durability of materials and structures

Expertise

  • Theoretical approach: behavior laws, modeling of irreversible processes and multiscale modeling.
  • Experimental approach: a test for every scale; field measurements for rapid characterization; developing new tests.
  • Numerical approach: implementation of behavior laws, numerical multiscale approaches, design and diagnostic tools.

Keywords:

Fatigue, aging, in-service performance, modeling, testing.

THE IRDL WEBSITE / PTR5

Examples of research programs in which ENSTA Bretagne is involved:
NEW "SELF-HEATING" ANR INDUSTRIAL CHAIR WITH NAVAL GROUP & SAFRAN: predict the in-service performance of air and naval systems

Led by ENSTA Bretagne (Dupuy de Lôme Research Institute), two industrial leaders and including the Institut P’, the "Self Heating" industrial chair has been accepted by the National Research Agency (ANR).

  • Total budget: €2,050,000, jointly financed by the ANR (50%), Naval Group and Safran (50%).
  • Duration: 4 years, from December 1, 2020
  • Dedicated team: 8 theses and 4 post-doctorates, supervised by 13 researchers
  • Title: characterization, modeling and rapid prediction of materials’ high cycle fatigue properties by thermometric measurements
  • Objectives and method: measure the heat signature of the fatigue mechanisms of materials for naval and air applications, in order to swiftly predict and determine the high cycle fatigue properties of these materials.

The “self-heating" method entails observation of the temperature curve of a material subject to repeated efforts which lead to its fatigue, under precise experimental conditions, in order to deduce its life span and predict weak points. The rapidity of study and precision of the findings are strengths for industry.

  • The digital models thus generated inform design office calculation codes, in order to delay and avoid damage when designing a vessel, submarine or aircraft.
  •  Safran and Naval Group are committed to extending this scientific approach to all of the materials used in their respective applications and to looking at the parameters acting on the fatigue of their materials (temperature, manufacturing process, type of loading, surface treatments and so on). 
DGA project “Frapan”

Fatigue of a marine thruster made by additive manufacturing.

ANR France Energies Marines project “Polyamoor”

This project carried out with IFREMER focuses on durable and flexible polyamide moorings for marine renewable energy applications.

CIFRE PhD thesis with Safran

Fatigue design thermomechanical research work for 3D-woven composite materials in aeronautical applications; rapid determination of the high cycle fatigue properties (based on self-heating testing under cyclic loadings) of metal alloys for turbojets.

CIFRE PhD thesis with Vibracoustic

The fatigue design thermomechanical research work focuses on parts made from different materials (polyurethane foam or glass fiber reinforced thermoplastics).

contact

Sylvain Calloch
Associate Professor
Assistant Director, Institut de Recherche Dupuy de Lôme (IRDL, UMR CNRS 6027)
+33 (0)2 98 34 87 23