Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Strength of sandwich-to-laminate single-lap bonded joints in elevated temperature and wet condition

샌드위치와 적층판을 접착한 단일겹침 체결부의 고온습도 강도특성 연구

  • 최배현 (경상대학교 대학원 항공우주공학과) ;
  • 권진회 (경상대학교 기계항공공학부) ;
  • 최진호 (경상대학교 기계항공공학부) ;
  • 신상준 (한국항공우주산업(주)) ;
  • 송민환 (한국항공우주산업(주))
  • Received : 2010.05.03
  • Accepted : 2010.10.13
  • Published : 2010.11.01
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Abstract

The main objective of this study is to experimentally investigate the effect of adhesive thickness and environmental conditions on the failure and strength of sandwich-to-laminate bonded joints. Three different adhesive thicknesses (t=0.2, 2 and 4 mm) and two different environmental conditions were considered. Environmental conditions include the RTD(room temperature and dry condition) and ETW(elevated temperature and wet condition). Test results show as the adhesive thickness increases from 0.2 mm to 2 and 4 mm, the joint strength decreases 16 and 30%, respectively. Regarding the effect of environmental conditions, except for one case, the joint strength in the ETW conditions turned out to be 12% higher than those in the RTD conditions. In the joints with adhesive thickness of 0.2 mm, remarkable difference from RTD condition was not found.

본 논문에서는 샌드위치-적층판 단일겹침 접착 조인트의 정적강도를 시험을 통해 연구하였다. 접착제의 두께(3종류 : 0.2, 2, 4 mm)와 환경조건(2가지 : 상온, 고온흡습)을 변화시키면서 총 38개의 시편을 제작하여 시험을 수행하였다. 시험 결과, 접착제의 두께가 0.2mm에서 2 mm 와 4 mm로 증가함에 따라 체결부의 파손강도가 각각 16% 와 30% 정도 감소하는 것으로 나타났다. 반면 고온흡습 환경에서의 파손강도는, 접착제의 두께가 0.2mm인 경우를 제외하면, 접착제의 열화현상이 적층판과 샌드위치 면재의 층간분리 혹은 층내분리 파손을 지연시켜, 상온건조 환경에 비해 약 12% 가량 높게 나타났다. 접착제의 두께가 얇은 0.2 mm의 경우 시험환경의 효과는 나타나지 않았다.

Keywords

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