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組合応力による重複疲労被害


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Title: 組合応力による重複疲労被害
Other Titles: On the Fatigue Damage of Double Stress Levels under Combined Stress
Authors: 真武, 友一 / 西谷, 弘信
Authors (alternative): Matake, Tomokazu / Nisitani, Hironobu
Issue Date: Dec-1972
Publisher: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
Citation: 長崎大学工学部研究報告, (3), pp.1-8; 1972
Abstract: There are many researching methods on the fatigue damage. Among them, the method of double stress levels is the most famous one and has brought many results about various materials, dimensions and heat-treaments. In this paper, the authors apply the torsional stress, as the special case of combined stress (ratio of principal stress is -1), and research whether the fatigue damage under its double stress levels follows the Miner's straight damage law or not. The results of the experiment indicate to satisfy the law on both cases of the high stress changing down to the low stress and the low up to the high, if it is taken the stress repetitions to initiate the crack having O.1mm length as the standard life, instead of the stress repetitions to fracture. According to ratio of stress repetitions to its fatigue life, crack initiation under the high stress level develops earlier than under the low stress level, but the life of its propagation is shorter life than the later.
URI: http://hdl.handle.net/10069/23786
ISSN: 02860902
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:No.3

Citable URI : http://hdl.handle.net/10069/23786

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