材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
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
牧野 泰三山本 三幸平川 賢爾
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1997 年 46 巻 10 号 p. 1178-1183

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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 initiate, for respective load levels do not coincide in the full-scale axle.

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