球状黒鉛鋳鉄の切欠効果と疲労破面による作用応力および疲労寿命の推定について
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概要
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The fatigue notch sensitivity of nodular cast iron was investigated on the collared specimens with various fillet radii with the object of comparing it with that of 0・6% C steel having nearly equal tensile strength ; and the shift of rupture area was examined as a function of stress level or fatigue life. When four kinds of fatigue notch factors β_<KD>, β_g, β_<KS> and β_S were introduced, the conclusions were summerlized as follows. (E.L. =Endurance Limit) β_<KD>=(E.L. of plain nodular cast iron specimens)/(E.L. of notched nodular cast iron specimens)=Apparent fatigue notch factor of nodular cast iron. β_g=(E.L. of the plain steel specimens having correlative matrix with nodular cast iron)/(E.L. of plain nodular cast iron specimens.) β_<KS>=(E.L. of the plain steel specimens having correlative matrix with nodular cast iron)/(E.L. of the notched steel specimens having correlative matrix with nodular cast iron) β_S=(E.L. of the plain tteel specimens having correlative matrix with nodular cast iron)/(E.L. of notched nodular castiron specimens.) 1) The apparent fatigue notch factor of nodular cast iron (β_<KD>) is much smaller than the fatigue notch factor of the steel having nearly equal tensile strength. 2) β_g depends on the states of graphite and matrix of nodular cast iron, being 1.5〜1.6 in the present test. (normalized nodular cast iron) 3) β_S Is much smaller than the product of β_g and β_<KS>, and nearly equal to the bigger of the two β_g and β_<KS>. 4) Accordingly, being β_g bigger than β_<KS>, the apparent fatigue notch factor of nodular cast iron (β_<KD>) is nearly equal to 1 unity. 5) The estimation of working stress level or fatigue life by the shift of rupture area appears possible as well in the case of nodular cast iron.
- 社団法人日本材料学会の論文
- 1958-01-15
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- 球状黒鉛鋳鉄の切欠効果と疲労破面による作用応力および疲労寿命の推定について