Fatigue resistance evaluation of high Mn-TWIP steel through damage mechanics: A new method based on stiffness evolution

The work presented here deals with the implementation of a new methodology that allows fast and reliable determination fatigue strength. It is based on monitoring specimen stiffness changes at different stress levels, as an indicator evolution damage. This rapid test uses techniques available in many laboratories, DIC (Digital Image Correlation) technique common extensometers. Moreover, obtained data are easier to handle than infrared cameras or acoustic emission systems data, experimental procedure determine limit more evident self-heating method. Experiments have been conducted TWIP (Twinning Induced Plasticity) steel, material used for lightweighting structural parts vehicles. With their excellent energy absorption capacity, steels can satisfy part requirements terms crash performance, while high tensile strength deal cyclic loads acting chassis parts. Therefore, efforts focus improving through pre-straining and/or surface treatments. However, finding best way improve resistance requires time resources often hinder development material. For this reason, steel has selected check test. prediction made using proposed approach validated by comparison conventional staircase results crack growth standardised tests. good agreement proposing method efficient metals.