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Analysis of Compressive Deformation Behaviors of Aluminum Alloy Using a Split Hopkinson Pressure Bar Test with an Acoustic Emission Technique

SHPB 시험과 음향방출법을 이용한 알루미늄 합금의 압축 변형거동 분석

  • 김종탁 (한양대학교 자동차공학과) ;
  • 우성충 (한양대학교 국방 생존성기술 특화연구센터) ;
  • 사공재 (한양대학교 자동차공학과) ;
  • 김진영 (국방과학연구소) ;
  • 김태원 (한양대학교 기계공학부)
  • Received : 2012.12.28
  • Accepted : 2013.05.15
  • Published : 2013.07.01

Abstract

In this study, the compressive deformation behaviors of aluminum alloy under high strain rates were investigated by means of a SHPB test. An acoustic emission (AE) technique was also employed to monitor the signals detected from the deformation during the entire impact by using an AE sensor connected to the specimen with a waveguide in real time. AE signals were analyzed in terms of AE amplitude, AE energy and peak frequency. The impacted specimen surface and side area were observed after the test to identify the particular features in the AE signal corresponding to the specific types of damage mechanisms. As the strain increased, the AE amplitude and AE energy increased whereas the AE peak frequency decreased. It was elucidated that each AE signal was closely associated with the specific damage mechanism in the material.

Keywords

Acoustic Emission;SHPB(Split Hopkinson Pressure Bar);Deformation Behavior;Strain Rate;Impact

Acknowledgement

Supported by : 국방과학연구소

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