Effect of understress on fretting fatigue crack initiation of press-fitted axle

Masanobu Kubota, Sotaro Niho, Chu Sakae, Yoshiyuki Kondo

    研究成果: Contribution to journalArticle査読

    13 被引用数 (Scopus)

    抄録

    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 σwf1. Rotating bending fatigue tests were performed using a 40 mm diameter press fitted axle assembly. Two step variable stresses consisting of σwf1 and half or one third of σwf1 were used in the experiment. Crack initiation life was defined as the number of cycles when a fretting fatigue crack, which is longer than 30 μm, 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 × 107 to 1.2 × 108 depending on the stress frequency ratio nL/nH. The sum of the number of cycles of higher stress at crack initiation NH 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.

    本文言語英語
    ページ(範囲)297-302
    ページ数6
    ジャーナルJSME International Journal, Series A: Solid Mechanics and Material Engineering
    46
    3
    DOI
    出版ステータス出版済み - 7 2003

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 機械工学

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