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

The Korean Society of Mechanical Engineers (대한기계학회)
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End-Shape Effect for Stress Concentration Reduction of Composite Single-Lap Bonded Joint

끝단형상에 따른 복합소재 단일겹치기 체결부의 응력집중 저감에 관한 연구

  • Kim, Jung-Seok (Railway Structure Department, Korea Railroad Research Institute) ;
  • Hwang, Jae-Yeon (Railway Structure Department, Korea Railroad Research Institute)
  • 김정석 (한국철도기술연구원 철도구조연구실) ;
  • 황재연 (한국철도기술연구원 철도구조연구실)
  • Received : 2010.11.10
  • Accepted : 2011.01.10
  • Published : 2011.03.01
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Abstract

We evaluated the stress-reduction effect for different shapes of a composite adherend with or without a spew fillet. Six different single-lap joint specimens were modeled and assessed using nonlinear finite element analysis. Moreover, we investigated the effect of the stiffness ratio of the adherend and adhesive. The single-lap joint with normal tapering had the highest stress values, and the single-lap joint with reverse tapering and a spew fillet had the lowest stress values. The composite adherends with higher stiffness had lower stress values, and the adhesives with lower stiffness had lower stress values.

본 연구에서는 복합소재 단일겹치기 조인트의 접착부재 형상 및 필렛 유무에 따른 응력집중 완화 효과를 평가하였다. 이를 위해 6가지 서로 다른 끝단부 형상에 대해 비선형 유한요소 해석을 수행하였다. 또한, 복합재 접착부재와 접착제의 다양한 강성비에 따른 6가지 모델의 최대 전단 및 수직응력의 변화를 고찰하였다. 접착부재가 순방향 테이퍼를 갖는 모델의 경우에는 가장 높은 응력값을 보여 조인트의 접합강도가 가장 취약할 것으로 예상되었다. 이에 반해, 접착부재가 역방향 테이퍼를 갖고 필렛이 존재할 경우 가장 낮은 응력값을 보였다. 접착부재와 접착제의 강성변화에 따른 최대응력 변화를 고찰한 결과 접착부재의 강성은 클수록, 접착제 강성은 낮을수록 응력집중은 완화되었다.

Keywords

References

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