Technical skill sheet

Thermomechanics and plasticity

  • Centre of research : MINES ParisTech, centre de mise en forme des matriaux - CEMEF
  • Prestation : Characterization, tries, tests, checks, formulation - Research and Development

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Thermomechanics and plasticity

Digital modelling of physical characteristic phenomena in solidification and forming processes of metals. Research is associated to the development of simulation software to improve the understanding and mastering of industrial processes. Realised in cooperation with other CEMEF groups, with Transvalor and partners in the industry.


Solutions for coupled problems : - thermomechanical coupling piece/tool - coupling thermal/microstructure/mechanics (phase change to solid state, double phase media liquid solid)

Prediction of faults such as striction in metal sheet forming or fissuration in solidification at high temperatures.

Development of instrumentalised representative experiments for the analysis and evaluation of criteria and limiting curve.

Study of discretisations of space and time adapted to representative comportment laws in solid state at high or low temperatures, in liquid state with turbulences, semi-solid state, compressibility.

Development of Euler-Lagrange methods for evaluation using dynamic grid pattern, adaptive and anisotropic, especially for liquid-solid interaction in solidification.

Development of inversed analysis procedures for finite elements for automatic identification of rheological or thermal parameters by simulation of characterisation tests (traction, torsion, compression, counter blow, thermal contact).

CEMEF research activities concern all types of material (metal, polymers, composites, glass, materials for food production...)


Parallel and sequential calculation capacities with about 10 parallel calculators with different architectures including one new cluster with 500 processors installed in 2008.

Microscopy : - optical transmission microscope (with microtraction device, film micro-compression, static crystallisation, in shear and in elongation) - inversed metallographic optical microscope Olympus PMG3

Scanning electron microscope : - environmental (Philips XL30 ESEM LaB6), heating plate Oxford 1500C, automatic EBSD with digital camera and Peltier effect plate Philips - Jeol 35CF - transmission and scanning electron microscopes (CM12 TEM/STEM Philips) with heated object holder 600C

Spectrometers : - EDX (Oxford/Inca on MEB Philips XL30 ESEM), (Tracor/Noran on MEB Jeol 35CF) - XPS (Riber MAC2) - static SIMS at flight time [ToF-SIMS] (PHI TRIFT I)

Infrared (Fourier transformed, microscope) - X-ray: diffractometer (X'pert Pro), texture goniometer, Debye Scherrer chamber

Physical measurements : - small angle light diffusion - moulding goniometer - rugosimeter 3D - image analyser (Visilog 6.3) - machine for measurements of thermal exchange coefficients - enthalpic differential analyser (DSC Perkin Elmer) - measurement system (deformations, displacement and thickness) by image correlation (ARAMIS system) - non-contact measurements, flow and deformation visualisation : - machine tools with observation windows (injection cast with transparent walls, pipes) - Doppler laser anemometer (Dantec) - flow birefringence - high speed camera (125 to 2500 images/s) - videometric extensometer - mechanical properties : - hardness, hot and cold, micro hardness, macro hardness - furnace for thermal processing, vacuum and under atmosphere (1200C)