Stress Concentration and Fatigue Strength of Bolt Head

Abstract

As found by the photo-elasticity and other experiments, the concentrated stress at the root of bolt head reaches very high value depending upon the form of bolt head, i.e. the radius of curvature ρ at the root of bolt head, height and diameters of bolt head and bolt shank etc. Especially the effect of ρ is most remarkable, then we performed the fatigue test in the case of different ρ. The results of test show that the fatigue strength increases as ρ becomes larger.