軸圧入部のフレッティング疲労き裂発生に及ぼす変動応力の影響 : 応力頻度比と荷重段数の影響と寸法効果(<特集>疲労)

概要

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The objective of the present paper is to evaluate the effect of variable stress amplitude, particularly those of the stress cycle ratio, number of load levels and axle size on the fretting fatigue crack initiation at press-fitted axle assembly. The rotational bending fatigue tests with two-level, three-level and ten-level loadings were conducted on the induction hardened press-fitted axles of 40mm in diameter. It was found that the modified Miner's damage(D)under the two-level variable load decreases as the stress cycle ratio increases, but D becomes constant when higher, lower and equivalent stress levels are the same respectively. For the size effect, D of 40mm diameter axle is less than 1.0, whereas D of full-scale axle is larger than 1.0. This size effect is caused by the fact that the locations of maximum stress, where cracks initate, for respective load levels do not coincide in the full-scale axle.
社団法人日本材料学会の論文
1997-10-15