Prediction of the Fatigue Fractue of a Bolt by Ultrasonic Flaw Detection : Vibration, Control Engineering, Engineering for Industry

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概要

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• It is difficult to perfectly predict the fatigue strength of a bolt in joints at the stage of strength design, since many factors influence the load on the bolt. This study treats the possibility of preventing the fatigue fracture of a bolt by detecting the fatigue crack at the thread root at an early stage by means of an ultrasonic flaw detector. A method is discussed in which a crack is initiated at the bolt thread root near the top surface of the nut, in the mating threads, by shortening the bolt pitch slightly against the nut pitch. By using this method, it is hoped that the period from the detection of the crack to the fracture will be lengthened. From the results of fatigue tests, it is clarified that pitch modification is effective in the case of relatively low mean stress.

• 一般社団法人日本機械学会の論文

著者

• Yoshimoto I

  Takushoku Univ. Tokyo Jpn

• Yoshimoto Isamu

  Research Laboratory Of Precision Machinery And Electronics Tokyo Institute Of Technology

• HAGIWARA Masaya

  Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology

• Hagiwara M

  Nagoya Inst. Technology Nagoya Jpn

• Hagiwara Masaya

  Research Laboratory Of Precision Machinery And Electronics Tokyo Institute Of Technology

• Fujino Y

  Asahi Glass Co. Ltd. Kanagawa Jpn

• IWATA Hisafumi

  Hitachi Seisakusho Co.

• FUJINO Yousuke

  Tokyo Institute of Technology

• Fujino Yosuke

  Tokyo Institute of Technology

関連論文

• The Relation between Load and Strength in Bolted Joints Subjected to Fatigue Loading
• Prediction of the Fatigue Fractue of a Bolt by Ultrasonic Flaw Detection : Vibration, Control Engineering, Engineering for Industry
• The Force Ratio of Booted Joints : The case where clamped parts are hollow cylinders

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