Stress concentration and fatigue strength of notched specimens under repeated bending moment (6th report) : circular shaft with a diametral hole no.3

Stress concentrations and notch factors are researched in hollow shafts with a diametral hole on one side and penetrated diametrally, and in solid shafts with a diametrally penetrated hole. The material used are 3 kinds of S-20C steel whose tensile strength are 50 and 69kg/mm^2 measured. The capacity of the testing machine is 1.5 kgm and the dia. of the specimen is 6mm. For the form factors of these notched specimens, the calculated results of lshibashi is used and the equation relating between the form factor α and the notch factor β is β=α〔1-ke^<-N>〕 N=n(1+n d/D) d/D where n=const, d, D inner dia outside dia. which is discussed in the last paper (5th report). Main results of these experiments are