RADIATION CHARACTERISTICS OF ULTRASONIC TIP ECHO AND ITS APPLICATION TO DETECT FATIGUE CRACK CLOSURE IN WELDING RESIDUAL STRESS FIELDS

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概要

• 論文の詳細を見る

• Ultrasonic tip echo is scattered wave which radiates all direction from the sharp tip of reflection source such as fatigue cracks. Tip echo has been utilized for sizing defects as so-called "tip echo method" and also may apply to identify fatigue cracks from other defects. In this study, radiation characteristics of the tip echo were experimentally examined. A linear phased array ultrasonic testing system was applied to send and receive ultrasonic waves in various directions. The experimental results demonstrated the relationship between incident wave directions and directivity of the tip echo. Besides, the tip echo method was applied to a fatigue crack in a welded steel plate, and damping of echoes due to fatigue crack closure was indicated.

• 公益社団法人 土木学会の論文

著者

• MIKI Chitoshi

  Dept. of Civil Eng., Tokyo Institute of Technology

• KUBOTA Takumi

  Dept. of Civil Eng., Tokyo Institute of Technology

• ONISHI Ryohei

  Dept. of Civil Eng., Tokyo Institute of Technology

• HANJI Takeshi

  Center for Urban Earthquake Eng., Tokyo Institute of Technology

関連論文

• CAUSE IDENTIFICATION OF FATIGUE CRACKS IN PLATE GIRDER-ON-STEEL FRAME PIER BRIDGE
• RADIATION CHARACTERISTICS OF ULTRASONIC TIP ECHO AND ITS APPLICATION TO DETECT FATIGUE CRACK CLOSURE IN WELDING RESIDUAL STRESS FIELDS
• FATIGUE PERFORMANCE OF COMPOSITE TUBULAR K-JOINTS FOR TRUSS TYPE BRIDGE

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