The reality of the concept of fatigue damage in multiple step amplitude loadings: Reason for unsuccessful results of existing damage counting models

To date the term “Fatigue Damage” has had an ambiguous usage in fatigue community. This paper explains reason for poor predictive results of existing damage rules, such as Miner’s rule, through precise observation small crack growth during multiple step loadings. For exact evaluation it is crucially important to attend phenomenon continuous decrease limit with until final failure. It stress amplitudes above a given size that contribute damage.