Detection of Fatigue Limit Thanks to Piezomagnetic Measurements

Many works have been attempted to propose fast methods to estimate the fatigue limit of materials. Fatigue limit is a high-cycle fatigue property that can be interpreted as a stress level above which the material is subjected to an accumulation of irreversible changes currently associated to the micro-plasticity activation. When a ferromagnetic material is concerned, the sensitivity of magnetic properties to microstructure makes magnetic techniques an interesting way to estimate this stress level. In this work, piezomagnetic measurements have been performed for that purpose. Results are compared to those obtained thanks to a self-heating method.