機械構造用炭素鋼の表面脱炭と疲労強さとの関係についての研究 (第5報)(2段2重重複繰返応力による表面脱炭鋼の疲労強さ)

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The cumulative fatigue damage produced by the multiple repeated stress levels was studied with the surface decarburized 0.16%C steel bar, of which the decarburized depth was 0.5 mm. In this fatigue test, two kinds of understress, each of which is respectively 0% and 5% below the fatigue limit of virgin material, wee adopted ad primary stress. This investigation was performed with the Ono-type rotary bending testing machine, from which the following facts are found : (1) The fatigue damage of surface decarburized steel bar which is put under understress becomes negative, that is, the fatigue limit may be improved by understressing, and the rate of its improvement becomes greater as the amount of understress approaches the fatigue limit of virgin material. (2) The rate of increment of fatigue limit for decarburized steel bar is greater than that for non-decarburized one. For the decarburized steel, the amount of increasing rate is about 16% at 0% understressing and 11% at 5% undrerstressing, respectively ; on the other hand, for the non-decarburized steel, their amounts were about 2% under both understresses. (3) This increment of fatigue limit for surface decarburized steel due to understressing becomes greater with the increase of the cycle ratio of primary stress reversal, while no increment is found in case of the non-decarburized steel. (4) The improvement of the fatigue strength due to understressing may be explained to be raised from the combined effect of the following factors, that is, (i) work-hardening in the surface decarburized zone of steel bar, (ii) the compressive internal stress in the surface of the decarburized zone produced by understressing.
社団法人日本材料学会の論文
1960-08-15

機械構造用炭素鋼の表面脱炭と疲労強さとの関係についての研究 (第5報)(2段2重重複繰返応力による表面脱炭鋼の疲労強さ)

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