Investigation on Strain Fatigue Life of Metal Bar with V-shaped Notch in a Radial-forging Cropping Method

Abstract

To estimate the radial-forging cropping time accurately, it is essential to obtain the strain fatigue life (SFL) of the metal bar with V-shaped notch. According to the radial-forging cropping mechanism, the relation curve between the fatigue strain and the SFL is constructed. Based on it, a new SFL formula of the metal bar with V-shaped notch, which is related to the fracture ductility of material, the fatigue strain critical value and the stress concentration factor of the V-shaped notch, is proposed. The comparison results for the metal bars show that the relative errors between the results obtained by the new SFL formula and the corresponding experimental results are within 10%.