محمدرضا گل بهار حقیقی

The intention of this study is to estimate fatigue damage and life of different steel alloys under uniaxial variable amplitude loading conditions based on Fatemi-Socie (FS), Macha and Carpinteri-Spagnoli critical plane strain-based models. Uniaxial variable loading spectra is counted and partitioned into the number of reversals by means of the rain flow cycle counting method. The largest stress and strain Mohr’s circles over the counted reversals are constructed to determine the maximum shear strain magnitude and corresponding stress to evaluate damage of each reversal. The total damage over entire loading history is then calculated based on the linear damage rule of Miner. The predicted lives based on three damage models are compared with those of reported experimental data.