Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
권호 표지

Experimental Investigation on the Behaviour of CFRP Laminated Composites under Impact and Compression After Impact (CAI)

충격시 CFRP 복합재 판의 거동과 충격후 압축강도에 관한 실험적 연구

  • Lee, J (Department of Aeronauties, Imperial College London, UK) ;
  • Kong, C (Department of Aerospace, Chosun University) ;
  • Soutis C. (School of Aerospace Engineering, Sheffield University)
  • Published : 2003.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

The importance of understanding the response of structural composites to impact and CAI cannot be overstated to develop analytical models for impact damage and CAI strength predictions. This paper presents experimental findings observed from quasi-static lateral load tests, low velocity impact tests. CAI strength and open hole compressive strength tests using 3 mm thick composite plates($[45/-45/0/90]_{3s}$- IM7/8552). The conclusion is drawn that damage areas for both quasi-static lateral load and impact tests are similar and the curves of several drop weight impacts with varying energy levels(between 5.4 J and 18.7 J) follow the static curve well. In addition, at a given energy the peak force is in good agreement between the static and impact cases. It is identified that the failure behaviour of the specimens from the CAI strength tests was very similar to that observed in laminated plates with open holes under compression loading. The residual strengths art: in good agreement with the measured open hole compressive strengths. considering the impact damage site area, an equivalent hole. The experimental findings suggest that simple analytical models for the prediction of impact damage area and CAI strength can be developed on the basis of the failure mechanism observed from the experimental tests.

충격 시나 충격 후 압축 할 때 구조용 복합재의 거동에 대한 중요성은 충격 손상과 충격후압축강도 예측에 대한 해석적 모델을 개발하기 위해 간과될 수 없을 것이다. 본 연구는 3mm두께의 $[45/-45/0/90_{3s}$ - IM7/8552린복합재판들을 이용하여 준정적횡하중시험, 저속충격시험, 충격후압축강도시험 및 구멍이 있는 시편의 압축강도시험 등을 수행한 후 이로 부터 발견된 결과들을 제시하였다 준정적횡하중과 충격하중시험에서 발생한 손상면적들이 서로 유사하며. 또한 5.4 J 부터 18.7 J 까지의 다양한 에너지준위들을 가진 낙하충격 시험 곡선들과 정적시험 곡선들도 서로 유사하다는 결론을 얻었으며. 이때 주어진 에너지 준위에서 정적과 충격시의 최대하중 값들이 잘 일치한다는 사실을 확인 하였다. 충격 후 압축시험에 의한 시편들의 파괴거동이 압축하중하의 구멍이 있는 적층판에서 관찰된 파괴거동과 매우 유사하과는 사실도 확인 되었다. 충격손상 후 잔류강도는 충격손상 등가구멍이 있는 경우의 시편에서 측정된 압축 강도와 잘 일치 하였다. 이와 같은 실험적 연구 결과들은 충격손상면적과 충격후압축강도의 예측에 대한 단순만 해석모델들이 이들 시험결과들로부터 관찰된 파괴기구를 기초로 하여 개발될 수 있음을 제시하고 있다.

Keywords

References

  1. Plsa ICAF National Review Whitehead,R.S.
  2. Impact Dynamics Damage on Composite Panels due to Low Velocity Impact Greszczuck,L.B.;Zukas,Z.A.(ed.);J.Wiley(ed.)
  3. Journal of Composite Materials v.22 no.July Impact-induced Delamination - a View of Bending Stiffness Mismatching Dahsin,L. https://doi.org/10.1177/002199838802200706
  4. International Journal of Impact Engineering v.16 no.3 Impact Response of Thick Class Fibre Reinforced Polyester Laminates Zhou,G.;Davis,G.A.O. https://doi.org/10.1016/0734-743X(94)00047-Z
  5. Proc. 26th Structures, Structural Dynamics, Materials Conf., Orlando, FL The Influence of Lay-up and Thickness on Composite Impact Damage and Compression Strength Guynn,E.G.;O'brien,T.K.
  6. Technical Report 94003, Defence Research Agency, Famborough The Effect of Stacking Sequence and Layer Thickness on the Compressive Behaviour of Carbon Composite Materials: Impact Damage and Compression after Impact Hitchen,S.A.;Kemp,R.M.
  7. Journal of Composite Materials v.22 On Low-Velocity Impact Testing of Composite Materials Sjoblem,P.O.;Hartness,J.T. https://doi.org/10.1177/002199838802200103
  8. Composite Part A v.28 no.7 Energy-Based Approach to Impact Damage on CFRP Laminates Delfosse,D.;Poursartip,A. https://doi.org/10.1016/S1359-835X(96)00151-0
  9. phD Thesis, University of London The Modeling of Impact Damage in Kevlar-Reinforced Epoxy Composite Structures Watson,S.A.
  10. phD Thesis Assesmnent of Low Velocity Impact Induced Damage on Laminated Composite Plates Hou,J.
  11. Mechanical Testing of Advanced Fibre composites Hodgkinson,J.
  12. Composite Science and Technology v.56 no.6 Prediction of The Post-Impact Compressive Strength CFRP Laminated Composites Soutis,C.;Curtis,P.T. https://doi.org/10.1016/0266-3538(96)00050-4
  13. Composite Structures v.35 no.2 Effect of Impact Damage on Residual Compressive Strength of Glass-Fibre Reinforced Polyester (GFRP) Laminates Zhou,G. https://doi.org/10.1016/0263-8223(96)00031-1
  14. Composite Part A v.27 no.12 Impact Damage and Residual Strengthes of Woven Fabric Glass/Polyester Laminates Davis,G.A.;Hitchings,D.;Zhou,G. https://doi.org/10.1016/1359-835X(96)00083-8
  15. Composite Part A v.32 no.9 Effect of Impact Damage on the Compressive Response of Composite Laminates Hawyes,V.J.;Curtis,P.T.;Soutis,C. https://doi.org/10.1016/S1359-835X(01)00072-0
  16. Plastics, Rubber and Composites v.31 no.8 Size Effect on Compressive Strength of T300/924C Carbon Fibre-Epoxy Laminates Soutis,C.;Lee,J.;Kong,C. https://doi.org/10.1179/146580102225006459
  17. Composite Part A v.31 no.6 Predicting the Compressive Engineering Performance of Carbon Fibre-Reinforced Plastics Soutis,C.;Smith,F.C.;Mathews,F.L. https://doi.org/10.1016/S1359-835X(99)00103-7