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IDENTIFICATION OF KINEMATIC HARDENING THANKS TO MAGNETIC METHOD

Abstract : Magnetic non destructive methods are widely used in the industries of steel since magnetic behavior demonstrates a good sensitivity to the microstructural and/or mechanical changes. It is well known that plastic deformations lead to a sharp degradation of the magnetic properties of ferromagnetic ma- terials (strong decrease of susceptibility, increase of hysteresis losses) especially for weak plastic strain levels. Therefore, Magnetic method can be potentially used to evaluate the plastic state of a material. This evaluation requires an accurate model as principal part of the non destructive procedure. This model has to predict the magnetic behavior of the material involved. It must on the other hand demonstrate low computation time to allow "on line" inverse identification of the mechanical and metallurgical state. Such magneto-mechanical modeling is proposed. It is based on the so-called mul- tidomain model. Plasticity is introduced through internal stress characterizing heterogenous biphasic structure. It is shown that kinematic hardening can be estimated by magnetic measurements.
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  • HAL Id : hal-01552441, version 1

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Said Lazreg, Olivier Hubert. IDENTIFICATION OF KINEMATIC HARDENING THANKS TO MAGNETIC METHOD. Colloque MECAMAT 2012, Jan 2012, Aussois, France. ⟨hal-01552441⟩

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