Cyclic stress-strain relation under high cycle fatigue process

Prediction of fatigue crack initiation life of aluminium alloy joints using cyclic elasto-plasticity FEM analysis

“…Previous works carried out by the authors [1][2][3][4][10][11][12][13][14][15], focused the attention on steel components; in this study, we extend the field of investigations to the aluminium alloy A5083-O.…”

“…A detailed explanation of the model features is beyond the scope of this paper, and the reader is referred to Ref. [1] for a complete discussion. The extended subloading surface model [5][6][7][8][9] describes the generation of plastic strain within the yield surface (subloading surface), which can be obtained through a similarity transformation from the conventional yield surface (referred to as the normal-yield surface in Fig.…”

“…The elasto-plastic behaviour was investigated with a plasticity model based on the subloading surface model, and extended to include the cyclic damage concepts [1][2][3][4]. A detailed explanation of the model features is beyond the scope of this paper, and the reader is referred to Ref.…”

“…Among fatigue failure processes, the prediction of fatigue initiation as a series of damage accumulation and crack initiation is one of the most challenging issues. For the purpose of describing and evaluating the mechanical fatigue processes of materials, a phenomenological plasticity model is proposed [1][2][3][4]. This model is based on a cyclic plasticity model [5][6][7][8][9] and has been extended to describe the behaviour of materials, especially steel, and applied to several case studies in low and high cycle fatigue life regions.…”

“…In order to characterize the crack initiation life, it is important to give a precise description of the elastoplastic behaviour, which was here investigated by [1][2][3][4][10][11][12][13][14][15]. In addition, the criteria for the fatigue crack initiation was defined based on the strain ranges.…”