日本機械学会論文集 A編
Online ISSN : 1884-8338
Print ISSN : 0387-5008
高強度鋼の疲労強度に及ぼす介在物の影響の定量的評価法
村上 敬宜児玉 昭太郎小沼 静代
著者情報
ジャーナル フリー

1988 年 54 巻 500 号 p. 688-696

詳細
抄録

First, the effects of nonmetallic inclusions on the fatique strength of metals are reviewed and the influential factors are revealed. Next, it is emphasized that the effects of nonmetallic inclusions must be analyzed from the viewpoint of small defects or small cracks, because the threshold condition at the fatigue limit is not the condition for crack initiation but the condition for the non-propagation of a crack emanating from defects or inclusions. Finally. from this point of view, the equation for the prediction of the threshold stress intensity factor range ΔKth and fatigue limit σw for defects and small cracks was applied to predict those for inclusions contained in high strength steels. It is demonstrated that the square root of the projected area of inclusions and the Hv of the matrix are the crucial parameters to predict the fatigue limit of metals containing inclusions. The predictions by the proposed equations were in very good agreement with the experimental results obtained from the fracture surface showing fish-eye patterns. The reasons why the fatigue limit σw of high strength steels does not increase linearly with increasing hardness, and why the scatters of fatigue limit are so large are made clear.

著者関連情報
© 社団法人日本機械学会
前の記事 次の記事
feedback
Top