Journal of Aerospace System Engineering (항공우주시스템공학회지)

The Society for Aerospace System Engineering (항공우주시스템공학회)
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Progressive Filure Analysis of Composite Double Bolted Joints using Gradual Degradation Model

점진적 강성 저하 모델을 이용한 복합재 이중 볼트 체결부의 점진적 파손 해석 연구

  • Kim, Pyunghwa (Graduate School of Korea Aerospace University) ;
  • Kim, Sungmin (Graduate School of Korea Aerospace University) ;
  • Doh, Sungchul (Graduate School of Korea Aerospace University) ;
  • Yoon, Donghyun (Graduate School of Chungnam National University) ;
  • Park, Jungsun (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 김평화 (한국항공대학교 대학원) ;
  • 김성민 (한국항공대학교 대학원) ;
  • 도성철 (한국항공대학교 대학원) ;
  • 윤동현 (충남대학교 대학원) ;
  • 박정선 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2018.12.13
  • Accepted : 2019.09.20
  • Published : 2019.12.31
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Abstract

In this paper, progressive failure analysis is performed on composite joints widely used in various industries such as the aerospace industry. The analysis was conducted on single bolted joints to confirm its reliability and in succession on double-bolted composite joints as well to study the characteristics of progressive failure. Hashin failure criteria and EGDM (energy based gradual degradation model) were used for the analysis. Failure variables are defined by four failure modes, respectively. According to the variables, stiffness degradation has been calculated. As a result of comparing the test and analysis results of single-bolted joints, the error was below 5% and it showed that the analytical results are rather credible. Also, the parametric analysis consequences were obtained conducting the process-progressive failure analysis on the double-bolted composite joints considering edge-distance ratio (e/d ratio) and bolt spacing.

본 논문에서는 항공우주분야 등 여러 분야에서 사용되는 복합재 볼트 체결부에 대해 점진적 파손 해석을 수행하였다. 단일 볼트 체결 시편에 대한 해석을 통해 해석 방법에 대해 검증하고 이를 이용해 이 중 볼트 체결 시편의 점진적 파손에 관해 연구하였다. 점진적 파손 해석을 위해 Hashin 파손 판정식과 에너지 기반 점진적 파손모델을 사용하였다. 복합재료의 4가지 파손모드에 대해 손상변수를 정의했다. 이에 따른 물성저하를 계산하였다. 단일 볼트로 체결된 시편에 대해 시험 및 점진적 파손해석을 수행하여 시험 및 해석결과를 비교한 결과 약 5% 이하의 오차로 해석의 신뢰성을 확인하였다. 이중 볼트 체결 시편에 대해 점진적 파손해석을 이용해 볼트 원공으로부터 모서리까지의 거리와 볼트 사이의 간격을 고려하여 이중 볼트 체결부에 대한 매개변수 분석을 수행하였다.

Keywords

References

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