Composites Research

  • 제32권5호
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  • Pages.270-278
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  • 2019
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  • 2288-2103(pISSN)
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  • 2288-2111(eISSN)
한국복합재료학회 (The Korean Society for Composite Materials)
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계면 특성을 고려한 무작위 섬유배치를 갖는 단방향 복합재료의 가로방향 기계적 물성 예측 및 보정

Prediction and Calibration of Transverse Mechanical Properties of Unidirectional Composites with Random Fiber Arrangement Considering Interphase Effect

  • Park, Shin-Moo (Department of Mechanical Engineering, Jeonbuk National University) ;
  • Kim, Do-Won (Department of Mechanical Engineering, Jeonbuk National University) ;
  • Jeong, Gyu (Department of Mechanical Engineering, Jeonbuk National University) ;
  • Lim, Jae Hyuk (Department of Mechanical Engineering, Jeonbuk National University) ;
  • Kim, Sun-Won (Satellite Bus Development Division, Korea Aerospace Research Institute)
  • 투고 : 2019.04.16
  • 심사 : 2019.10.14
  • 발행 : 2019.10.31
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초록

본 연구에서는 섬유, 기지 및 계면으로 구성된 단방향 복합재료의 대표체적요소를 이용해서 가로방향 기계적 물성을 계면 특성 변화에 따라 예측하고 시험결과에 맞춰 계면의 특성의 보정을 실시하였다. 섬유와 기지로 모델링 된 기존의 대표체적요소는 섬유 길이방향 기계적 물성에 대해 예측 정확도가 높으나 가로방향에 대하여 어느 정도의 편차를 보인다. 따라서, 이런 차이를 보완하기 위해 계면 영역을 도입하였고, 계면의 두께, 탄성 물성과 강도 파라미터에 따라 기계적 물성을 보정하여 복합재료 대표체적요소를 통한 예측의 정확도를 향상시켰다. 그 결과, 복합재료 대표체적요소의 길이방향 물성의 정확도는 유지한 채 가로방향 강성 및 강도의 정확도가 향상됨을 확인하였다.

In this study, the transverse mechanical properties of the unidirectional fiber reinforced composite modeled with fiber, matrix, and interphase is predicted with the representative volume elements and is calibrated by adjusting the properties and thickness of the interphase by referring to the test results. While the conventional representative volume elements modeled with fiber and matrix shows high predictive accuracy for the longitudinal mechanical properties, but it shows some deviations in the transverse mechanical properties. In order to compensate such gaps, the interphase region is employed, and its mechanical properties are adjusted to improve the prediction accuracy according to various elastic modulus, thickness, and strength parameters. As a result, the deviation of the transverse elastic modulus and strength is reduced significantly similar to the test results of the unidirectional composites with the accuracy of the longitudinal mechanical properties preserved.

키워드

참고문헌

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피인용 문헌

  1. 단방향 연속 섬유 복합재 횡단면에서 섬유 배열에 따른 응력 분포 변화 vol.33, pp.1, 2019, https://doi.org/10.7234/composres.2020.33.1.030
  2. Effect of Graphitic Nanofibers on Interfacial Adhesion and Fracture Toughness of Carbon Fibers-reinforced Epoxy Composites vol.34, pp.2, 2019, https://doi.org/10.7234/composres.2021.34.2.082