A Proposal of Deciding Fatigue Strength in Bending Fatigue Test
A Proposal of Deciding Fatigue Strength in Bending Fatigue Test作者机构：Osaka University Osaka 567-0047 Japan Graduate School of Engineering Nagoya University Aichi 464-8603 Japan Graduate School of Engineering Osaka University Osaka 567-0047 Japan Department of Naval Architecture and Ocean Engineering Chosun University Gwangju 501-759 Korea
出 版 物：《Journal of Mechanics Engineering and Automation》 (机械工程与自动化（英文版）)
年 卷 期：2014年第4卷第2期
页 面：158-164页
学科分类：080503[工学-材料加工工程] 08[工学] 082304[工学-载运工具运用工程] 080204[工学-车辆工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 0823[工学-交通运输工程]
主 题：Fatigue crack fatigue strength fatigue life crack initiation/propagation potential difference FSM.
摘 要：Generally, the fatigue crack is initiated and then it is propagated toward the welding direction and the thickness direction. Finally, the joints lose the resistance to the external force. At present, as there is no deciding method of the fatigue strength （fatigue life）, this paper proposed it from the result obtained by bending test for fillet welded joints. Judging initiation of the fatigue crack from the measured value of strain gages, there was a possibility that the fatigue crack occurred at both sides of fillet welded joints. However, this was a different result from that of macrograph of cross section. On the other hand, the results obtained by FSM （field signature method） coincided with the result of macrograph of cross section. For the initial state, potential difference obtained by the electrostatic analysis based on FEM （finite element method） and that by FSM was accurately coincided. After confirming validity of the crack model for analysis, the crack model was specified by reproducing the propagating process of crack accurately through trial and error. It was concluded that the state which could not resist to the external force was regarded as fatigue strength based on equivalent stress obtained by elastic stress analysis for specified crack model. From the experimental result, it was proposed that 90% of repetition number corresponding to the state which could not resist to the external force （at the finish of the test） was regarded as fatigue strength （fatigue life） in consideration of safety and as the first approximation.
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