Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on the Kinetic Energy and Dispersion Behavior of High-velocity Impact-induced Debris Using SPH Technique

SPH 기법을 이용한 고속충돌 파편의 운동에너지와 분산거동 연구

  • Sakong, Jae (Dept. of Automotive Engineering, Hanyang Univ.) ;
  • Woo, Sung-Choong (Survivability Technology Defense Research Center, Hanyang Univ.) ;
  • Kim, Tae-Won (School of Mechanical Engineering, Hanyang Univ.)
  • 사공재 (한양대학교 자동차공학과) ;
  • 우성충 (한양대학교 국방 생존성기술 특화연구센터) ;
  • 김태원 (한양대학교 기계공학부)
  • Received : 2015.10.30
  • Accepted : 2016.03.31
  • Published : 2016.05.01
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Abstract

In this study, we investigate the dispersion behavior of debris and debris cloud generated by high-velocity impacts using the smoothed particle hydrodynamics (SPH) technique. The projectile and target plate were made of aluminum, and we confirm the validity of the SPH technique by comparing the measured major and minor axis lengths of the debris cloud in the reference with the predicted values obtained through the SPH analysis. We perform high-velocity impact and fracture analysis based on the verified SPH technique within the velocity ranges of 1.5~4 km/s, and we evaluate the dispersion behavior of debris induced by the impact in terms of its kinetic energy. The maximum dispersion radius of the debris on the witness plates located behind the target plate was increased with increasing impact velocity. We derive an empirical equation that is capable of predicting the dispersion radius, and we found that 95％ of the total kinetic energy of the debris was concentrated within 50％ of the maximum dispersion radius.

본 연구에서는 입자완화 유체동역학기법을 이용하여 고속충돌에 의해 생성된 파편 및 파편운의 분산거동을 고찰하였다. 충격구와 표적판은 모두 알루미늄 소재를 대상으로 하였으며 해석을 통해 예측한 파편운의 장축 및 단축의 길이와 참고문헌의 실험값을 비교하여 기법의 타당성을 검증하였다. 검증된 SPH 기법을 기반으로 1.5~4 km/s의 속도 범위에서 고속충돌 및 파괴 해석을 수행하였으며 이에 따른 파편의 분산 거동을 운동에너지 관점에서 평가하였다. 표적판 뒤에 배치된 관측판상에 분포된 파편의 최대 분산반경은 충돌속도가 증가함에 따라 증가하였다. 충돌시 발생하는 파편의 분산 거동을 바탕으로 손상범위 예측을 위한 경험식을 도출하였고, 파편 운동에너지의 95 %는 최대분산반경의 50 % 이내에 집중됨을 확인하였다.

Keywords

References

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