Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on Strength Prediction of Mechanical Joint of Composite under Bending Load

굽힘 하중을 받는 복합재 기계적 체결부의 강도예측에 관한 연구

  • Baek, Seol (School of Mechanical Engineering, Yonsei Univ.) ;
  • Kang, Kyung-Tak (School of Mechanical Engineering, Yonsei Univ.) ;
  • Lee, Jina (School of Mechanical Engineering, Yonsei Univ.) ;
  • Chun, Heoung-Jae (School of Mechanical Engineering, Yonsei Univ.)
  • Received : 2014.12.12
  • Accepted : 2014.12.26
  • Published : 2014.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

This paper predicted the strength of mechanical joint of composites under bending load by means of the characteristic curve method. The method has been employed only for tensile and compression load conditions, but in this study, this method was extended to the bending load condition. For the finite element analysis (FEA), the nonlinear analysis was conducted considering the contact and friction effects between composite material and pin. The failure strength and mode on characteristic curve were evaluate with Tsai-Wu failure theory. To validate the results of FEA, the experiments were conducted to find out the failure load by applying bending moment on the composite specimens. The results showed reasonable agreements with theoretical results. These results lead to a conclusion that the characteristic curve method can be applied to predict the bending strength of mechanical joint of composites.

본 논문에서는 특성길이 및 특성 곡선 방법을 굽힘 하중 상태의 복합재 기계적 체결부에 적용하여 강도를 예측하는 연구를 수행하였다. 선행 연구들이 특성길이 및 특성 곡선 방법을 인장과 압축 하중에만 적용한 것과 달리 본 연구에서는 굽힘 하중에 적용하고 그 가능성을 확인했다. 체결부 파손 해석을 위해 ABAQUS를 사용하여 핀과 모재의 접촉 및 마찰을 고려한 비선형 해석을 수행하였다. 해석결과를 이용하여 얻은 특성 곡선상에서 Tsai-Wu 이론을 적용하여 파손 및 파단 양상을 예측하였다. 또한 복합재 시편에 굽힘 하중을 가해 파손하중을 알아보는 실험을 통해 검증한 결과 해석으로 얻은 복합재 체결부의 파손하중이 실험 결과와 매우 잘 일치함을 확인하였다. 결론적으로 특성길이 및 특성 곡선 방법이 굽힘 하중 상태의 복합재 기계적 체결부의 강도를 비교적 잘 예측할 수 있다는 것을 알 수 있었다.

Keywords

References

  1. Jones, R.M., "Mechanics of Composite Materials", Mcgraw Hill, NY, 1975.
  2. Gweon, J.H., Choi, J.H., and Chun, Y.J., "A Study on the Strength of Mechanically Fastened Composite Joint," Journal of the Korean Society for Composite Material, Vol. 15, 2002, pp. 9-16
  3. Kim, T.H., Sung, M.S., Gweon, J.H., and Choi, J.H., "A Parametric Study on the Strength of Single-Lap Bonded Joints of Carbon Composite and Aluminum", Journal of the Korean Society for Composite Materials, Vol. 20, 2007, pp. 34-42.
  4. Whitney, J.M., and Nuismer, R.J., "Stress Fracture Criteria for Laminated Composites Containing Stress Concentration", Journal of Composite Materials, Vol. 10, 1974, pp. 253-265.
  5. Chang, F.K., and Scott, R.A., "Strength of Mechanically Fastened Composite Joints", Journal of Composite Materials, Vol. 16, 1982, pp. 470-494. https://doi.org/10.1177/002199838201600603
  6. Park, N.H., Gweon, J.H., Choi, J.H., Kim, K.S., and Lee, S.K., "A study on the Mechanical Joint Analysis of Composite Laminate Using Characteristic Length", Journal of The Korean Society for Aeronautical & Space Sciences, 2001, pp. 295-299.
  7. Chun, Y.J., Choi, J.H., and Kweon, J.H., "A Study on the Strength of Mechanically Fastened Composite Joint Using the Failure Area Index Method", Journal of the Korean Society for Composite Materials, Vol. 16, 2003, pp. 1-8.
  8. Hart-smith, L.J., "Mechanically Fastened Joints for Advanced Composites - Phenomenological Considerations and Simple Analysis," Fibrous Composite in Structural Design. Plenuum Press, 1980, pp. 543-574.
  9. Whitney, J.M., and Nuismer, R.J., "Uniaxial Failure of Composite Laminated Containing Stress Concentrations", Fracture Mechanics of Composites, 1975, pp.117-148.
  10. Hollman, K., "Failure Analysis of Bolted Composite Joints Exhibiting In-plane Failure Modes", Journal of Composite Materials, Vol. 30, 1996, pp. 358-383. https://doi.org/10.1177/002199839603000304
  11. Pierron, F., and Cerisier, F., "A Numerical and Experimental Study of Composite Materials", Vol. 34, 2000, pp. 1028-1054. https://doi.org/10.1177/002199830003401204
  12. Chang, F.K., "The Effect of Pin Load Distribution on the Strength of Pon Loaded Holes in Laminated Composites", Journal of Composite Materials, Vol. 20, 1986, pp. 401-408. https://doi.org/10.1177/002199838602000407