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Impact Performance of Crashworthy Post Utilizing Conservation of Linear Momentum

선운동량 보존의 법칙을 활용한 감충지주의 충돌거동

  • Ko, Man-Gi (Department of Civil & Environmental Engineering, Kongju National University) ;
  • Kim, Kee-Dong (Department of Civil & Environmental Engineering, Kongju National University) ;
  • No, Min-Hyung (Department of Civil & Environmental Engineering, Kongju National University) ;
  • Yun, Duk-Geun (Highway and Transportation Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • 고만기 (공주대학교 건설환경공학부) ;
  • 김기동 (공주대학교 건설환경공학부) ;
  • 노민형 (공주대학교 건설환경공학부) ;
  • 윤덕근 (한국건설기술연구원 도로연구소)
  • Received : 2015.11.23
  • Accepted : 2015.12.04
  • Published : 2015.12.31

Abstract

Unshielded posts on roadside are a critical hazard to the safety of impact vehicle to the posts. A crashworthy post is developed. In the first phase, it dissipates the impact energy by the linear momentum conservation principle while the plastic impact between the post and vehicle takes place, then, the second phase dissipation follows by the deformation of the energy absorbing modules embedded in the guide trough of the foundation. Simulations of impacts to a rigidly connected post and crashworthy post were made using LS-DYNA program, which demonstrated the danger of unshielded rigidly connected post and the effectiveness of the proposed crashworthy post to the 0.9ton-80km/h impact.

도로변에 노출된 지주는 충돌 시 탑승자 안전에 치명적인 위험물이다. 노출된 지주에 충돌하는 차량의 탑승자 안전을 도모하기 위하여 차량과 지주가 소성충돌로 일체화 되는동안 충돌차량의 선형운동량이 지주로 전달되어 충돌에너지의 일부가 1차적으로 소산되고 감소된 속도로 이동하는 지주의 베이스가 기초에 매입된 충격에너지 흡수용 모듈을 충격하여 변형시킴으로써 나머지 에너지가 소산되는 감충지주를 개발하였다. LS-DYNA프로그램을 이용한 충돌 해석을 실시하여 강결된 지주의 문제점을 보이고 개발 단계별 감충지주와 차량의 거동을 분석하여 최종 설계된 감충지주가 노출상태에서 0.9ton-80km/h의 속도로 정면충돌하는 경우에 안전하게 대응할 수 있음을 확인하였다.

Keywords

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