Uniaxial cyclic deformation and fatigue behavior of AM50 magnesium alloy sheet metals under symmetric and asymmetric loadings

A phenomenological stress–strain model for wrought magnesium alloys under elastoplastic strain-controlled variable amplitude loading

“…The effective sheet width is 650 mm, and the manufacturing process is described in detail in [3]. Samples for microstructural characterization of AM50 were grinded, polished, and etched with picric acid solution similar to [23,30], and the optical microscope Leitz Laborlux 12ME was used.…”

“…[9,[14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]). A comprehensive summary of fatigue investigations on wrought magnesium alloys is given in [30]. Accordingly, most low-cycle fatigue investigations [9,[14][15][16][17][18][19][20][21][22][23] were done using completely reversed strain-controlled conditions, and in [24][25][26][27][28][29][30] the influence of the strain ratio was considered.…”

“…A comprehensive summary of fatigue investigations on wrought magnesium alloys is given in [30]. Accordingly, most low-cycle fatigue investigations [9,[14][15][16][17][18][19][20][21][22][23] were done using completely reversed strain-controlled conditions, and in [24][25][26][27][28][29][30] the influence of the strain ratio was considered. The Manson-Coffin-Basquin approach [31][32][33] was found to show an adequate correlation with the experiments for completely reversed strain-controlled conditions (e.g.…”

“…[9,[15][16][17][18][19]23]). In addition, energy based fatigue models were shown to give good correlation in cases of variable strain or stress ratios [20,22,26,29,30]. http Zenner and Renner [34] analyzed the shape of hysteresis loops at variable amplitude loading and showed that different magnesium alloys exhibit material memory.…”

“…In most previous studies, the experimentally determined hysteresis loops were used to obtain the necessary values (e.g. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]), which is not practicable in an engineering fatigue analysis. Therefore, the shape of stress-strain hysteresis loops must be described with an efficient model.…”