切欠効果に関する研究 : 第5報クランク軸隅角部の切欠効果について

概要

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It has been recognized that, owing to the notch effect, the fatigue failure of the crank shaft begins at reentrant corner formed of the arm and the crank journal or crank pin, but the notch effect has not been known entirely. E. Lehr took the value of the form factor approximately that of the angle plate, which is similar to the cross section of the crank shaft. In order to design the crank shaft, the notch factor of reentrant corners more necessary for us than the form factor of that. And so in this investigation the fatigue tests with the model specimens of medium hard steel, similar to the crank, was carried out, and the notch factor at the reentrant corner was obtained. The experimental results are shown in Table 1,where ρ is the fillet radius of reentrant corner and d the diameter of journal part, and the value of the form factor is calculated from the experimental formula, which was obtained. by Kettenacker's photoelastic test on the angle plate similar to the cross section of our model specimen. And it was clarified from Table 1 that the value of the notch factor is much smaller than that of the form factor and slightly affected by the ratio of ρ/d. Table 1 Experimental Results [table]
社団法人日本機械学会の論文
1952-01-20