New energy model of fatigue damage accumulation and its verification for 45-steel

A method of fatigue damage accumulation based upon application of energy indicators of the fatigue process is proposed in the paper. The approach is based on the assumption that the constant fatigue damage lines exist and a diagram of the accumulated dissipation energy represents their boundary line being a function of the number of cycles until fatigue failure at a constant level of the total strain. An experimental verification shows a satisfactory agreement between the fatigue life calculation results (based upon the hypothesis) and test results. The method is sensitive to a change of both the sequence of loading cycles and number of cycles on a particular level. Therefore, the ''cycle by cycle'' calculation course is possible.