Journal of Mechanical Science and Technology

  • 제20권2호
  • /
  • Pages.197-204
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  • 2006
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Evaluation of Fracture Behavior of SA-516 Steel Welds Using Acoustic Emission Analysis

  • Na, Eui-Gyun (Mechanical Department of Engineering College, Kunsan National University) ;
  • Ono, Kanji (Department of Materials Science and Engineering, University of California) ;
  • Lee, Dong-Whan (Mechanical Department of Engineering College, Chonbuk National University)
  • 발행 : 2006.02.01
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초록

The purpose of this study is to evaluate the AE characteristics for the basemetal, PWHT (post-weld heat treatment) and weldment specimens of SA-516 steel during fracture testing. Four-point bending and AE tests were conducted simultaneously. AE signals were emitted in the process of plastic deformation. AE signal strength and amplitude of the weldment was the strongest, followed by PWHT specimen and basemetal. More AE signals were emitted from the weldment samples because of the oxides, and discontinuous mechanical properties. AE signal strength and amplitude for the basemetal or PWHT specimen decreased remarkably compared to the weldment because of lower strength. Pre-cracked specimens emitted even lower event counts than the corresponding blunt notched specimens. Dimple fracture from void coalescence mechanism is associated with low-level AE signal strength for the basemetal or PWHT. Tearing mode and dimple formation were shown on the fracture surfaces of the weldment, but only a small fraction produced detectable AE.

키워드

참고문헌

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