M. Klesnil

TL;DR: In this article, a cyclic stress-strain curve, fatigue life curves, shape and area of hysteresis loops, and dislocation substructures were investigated on polycrystalline copper and copper-31% zinc specimens cycled with constant plastic strain amplitudes in low amplitude, high cycke region (N > 105 cycles to fracture).

TL;DR: In this article, the effect of stress cycle asymmetry on fatigue crack rate and on the conditions for a crack not to propagate was studied on sheet steel specimens with a sharp central notch.

TL;DR: In this article, the relation between the stress concentration factor and the fatigue notch factor was derived theoretically, taking into account both the effect of the cyclic plasticity at the notch root and the influence of the notch stress field on the nucleated cracks.

TL;DR: In this paper, the fatigue life curves were determined both for cycling with constant stress amplitude and for cyclic plastic strain amplitude in the high cycle region (number of cycles to fracture > 105) in eight different materials with U.S.T. ranging from 5 to 80 kpmm−2.