外周切欠材の応力周中と回転曲げ疲労強度について(第6報) : 孔付円筒その3

概要

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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; The fatigue limit of a hollow specimen is lower than that of a slid. The notch factor β of an hollow shaft with one side diametral hole is higher than that of penetrated diametral hole. The variation of β according to d/D agress with the calculated β in the above formula.
山口大学の論文