Effect of Understress on Fretting Fatigue Crack Initiation of Press-Fitted Axle
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概要
- 論文の詳細を見る
Axles are one of the most important components in railway vehicles with regard to safety, since a fail-safe design is not available. The problems of fretting fatigue crack initiation in a press-fitted axle have not been completely solved even though up-to-date fatigue design methods are employed. The objective of the present study is to clarify the effect of understress on fretting fatigue crack initiation behavior in the press-fitted axle. Most of the stress amplitude given to the axle in service is smaller than the fretting fatigue limit based on the stress to initiate cracks under a constant load σ_<wf1>. Rotating bending fatigue tests were performed using a 40mm-diameter press-fitted axle assembly. Two-step variable stresses consisting of σ_<wf1> and half or one-third of σ_<wf1> were used in the experiment. Crack initiation life was defined as the number of cycles when a fretting fatigue crack, which is longer than 30μm, was found using a metallurgical microscope. Fretting fatigue cracks were initiated even when the variable stress did not contain the stress above the fretting fatigue crack initiation limit. The crack initiation life varied from 4.0×10^7 to 1.2×10^8 depending on the stress frequency ratio n_L/n_H. The sum of the number of cycles of higher stress at crack initiation N_H was much smaller than the number of cycles to initiate cracks estimated from the modified Miner's rule. The value of the modified Miner's damage ranged from 0.013 to 0.185. To clarify the effect of variable amplitude on the fretting fatigue crack initiation, a comprehensive investigation related to relative slip, tangential force and fretting wear is necessary.
- 一般社団法人日本機械学会の論文
- 2003-07-15
著者
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KUBOTA Masanobu
Department of Mechanical Engineering Science, Kyushu University
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Kondo Yoshimasa
NGK INSULATORS, LTD.
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Kondo Yoshimasa
Ngk Insulators Ltd.
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Kondo Yoshiyuki
Department Of Applied Chemistry And Bioengineering Graduate School Of Engineering Osaka City Univers
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NIHO Sotaro
Graduate student, Kyushu University
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SAKAE Chu
Department of Intelligent Machinery & Systems, Kyushu University
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Niho Sotaro
Kyushu University
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Kubota Masanobu
Faculty Of Engineering Kyushu Univ.
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Kubota Masanobu
Department Of Mechanical Engineering Science Kyushu University
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Sakae Chu
Faculty Of Engineering Kyushu Univ.
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Kubota Masanobu
Department of Intelligent Machinery & Systems, Kyushu University
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