Examination of Fatigue Failure of Metals by Means of Electro-Plating Method

Abstract

Fatigue fracture is studied for the α-brass of different grain size, varied from 0.04mm to 1.5mm. The shearing-strain concentrates intensely at the grain-boundaries for the brass of comparatively large grain size. But with the decrease of grain size, the strain concentration is gradually relieved. Results show that the factor governing the fatigue failure of specimens is not the nominal stress derived from usual theory of elasticity based on the assumptions of homogeneity and isotropy, but is the microscopically maximum shearing-stress occurring in specimens.