Fatigue Fracture Assessment of Honeycomb Composite Side-Wall Panel Joint for the KTX Tilting Car Body

틸팅차량용 KTX 차체의 하니컴복합재 측벽판 체결부의 피로파괴평가

  • Jeong, Dal-Woo (Department of Mechanical Engineering, Hanyang University) ;
  • Kim, Jung-Seok (Railroad Structure Research Department, Korea Railroad Research Institute) ;
  • Choi, Nak-Sam (Department of Mechanical Engineering, Hanyang University)
  • 정달우 (한양대학교 기계공학과) ;
  • 김정석 (한국철도기술연구원 철도구조연구실) ;
  • 최낙삼 (한양대학교 기계공학과)
  • Published : 2010.01.01


The honeycomb composite joint structure designed for application to a tilting KTX railroad car body is subjected to bending loads of a cantilever type. Honeycomb sandwich composite panel-joint attached in the real tilting car body was fabricated and sectioned as several beam-joint specimens for the bending test. The fracture behaviors of these specimens under static loads were different from those under cyclic loads. Static bending loads caused shear deformation and fracture in the honeycomb core region, while fatigue cyclic bend loading caused delamination along the interface between the composite skin and the honeycomb core, and/or caused a fracture in the welded part jointed with the steel under-frame. These fracture behaviors could occur in other industrial honeycomb composite joints with similar sub-structures, and be used for improving design parameters of a honeycomb composite joint structure.


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