한국전산구조공학회논문집 (Journal of the Computational Structural Engineering Institute of Korea)

  • 제22권6호
  • /
  • Pages.639-646
  • /
  • 2009
  • /
  • 1229-3059(pISSN)
  • /
  • 2287-2302(eISSN)
한국전산구조공학회 (Computational Structural Engineering Institute of Korea)
권호 표지

고유동 강섬유보강 모르타르의 유동에 따른 섬유의 방향성 분포특성 변화의 예측

Numerical Simulation for the Variation of the Fiber Orientation Distribution according to the Flow of High-Flow Steel-Fiber Reinforced Mortar

  • 강수태 (한국건설기술연구원 구조교량연구실) ;
  • 김진근 (한국과학기술원 건설 및 환경공학과)
  • 투고 : 2009.09.28
  • 심사 : 2009.11.04
  • 발행 : 2009.12.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

고유동 강섬유보강 모르타르는 타설과정에서 특정한 섬유 방향성 분포를 가질 수 있으며, 이에 따라 재료의 인장거동 특성에 영향을 미칠 수 있다. 본 연구에서는 고유동 강섬유보강 모르타르의 타설단계에서의 유동에 따른 강섬유의 섬유 방향성 분포의 변화를 해석적으로 구하였다. 해석결과에 따르면 180mm 간격으로 나란히 놓여진 두 평판 사이에 흐르는 모르 타르의 전단흐름에 의한 섬유의 방향성 변화는 초기 150mm이내에서 크게 발생하는 것을 확인할 수 있었으며, 이후에서는 방향성 분포의 경향은 크게 변하지 않으며, 다만 흐름방향에 나란한 섬유의 밀도가 집중적으로 커지는 것을 볼 수 있었다. 섬유의 방향성과 섬유보강 복합체의 인장거동과 밀접한 관련성을 고려할 때, 이와 같은 방향성의 예측을 바탕으로 유동에 따른 고유동 강섬유보강 모르타르의 인장거동 변화의 예측이 가능할 것이다.

High-flow steel-fiber reinforced mortar may induce a certain fiber orientation distribution in the process of placing and thus have an influence on the tensile properties. In this paper, the variation of the fiber orientation distribution according to the flow of high-flow steel-fiber reinforced mortar was estimated in numerical simulation. The analytical results present that the major variation of fiber orientation distribution is made within 150mm of flow distance, thereafter the tendency of the fiber orientation distribution is not noticeable even though the peak of distribution density in the orientation parallel to the flow direction get bigger along the distance. Considering the close relation between the fiber orientation and the tensile behavior of composite, prediction of fiber orientation distribution make it possible to predict the variation in the tensile behavior of high-flow steel-fiber reinforced mortar according to the flow.

키워드

참고문헌

  1. Advani, S.G. (1994) Flow and Rheology in Polymer Composites Manufacturing, Elsevier Science, Amsterdam
  2. Advani, S.G., Tucker III, C.L. (1987) The Use of Tensor to Describe and Predict Fiber Orientation in Short Fiber Composites, Journal of Rheology, 31(8), pp.751-784 https://doi.org/10.1122/1.549945
  3. Akkaya, Y., Picka, J., Shah, S.P. (2000) Spatial Distribution of Aligned Short Fibers in Cement Composites, ASCE Materials in Civil Engineering, 12(3), pp.272-279 https://doi.org/10.1061/(ASCE)0899-1561(2000)12:3(272)
  4. Ausias, G., Agassant, J.F., Vincent, M. (1992) Rheology of Short Glass Fiber Reinforced Polypropylene, Journal of Rheology, 36(4), pp.525-543 https://doi.org/10.1122/1.550362
  5. Batchelor, G.K. (1970) Slender-Body Theory for Particles of Arbitrary Cross Section in Stokes Flow, Journal of Fluid Mechanics, 44, pp.419-440 https://doi.org/10.1017/S002211207000191X
  6. Chiba, K., Nakamura, K. (1998) Numerical Solution of Fiber Suspension Flow through a Complex Channel, Journal of Non-Newtonian Fluid Mechanics, 78, pp.167-185 https://doi.org/10.1016/S0377-0257(98)00067-6
  7. Chiba, K., Yasuda, K., Nakamura, K. (2001) Numerical Solution of Fiber Suspension Flow through a Parallel Plate Channel by Coupling Flow Field with Fiber Orientation Distribution, Journal of Non-Newtonian Fluid Mechanics, 99, pp.145-147 https://doi.org/10.1016/S0377-0257(01)00118-5
  8. Dinh, S.M., Armstrong, R.C. (1984) A Rheological Equation of State for Semiconcentrated Fiber Suspensions, Journal of Rheology, 28, pp. 207-227 https://doi.org/10.1122/1.549748
  9. Folgar, F., Tucker III, C.L. (1984) Orientation Behavior of Fibers in Concentrated Suspensions, Journal of Reinforced Plastics and Composites, 3, pp.98-119 https://doi.org/10.1177/073168448400300201
  10. Fox, R.W., McDonald, A.T., Pritchard, P.J. (2004) Introduction to Fluid Mechanics, John Wiley & Sons, Inc., USA
  11. Han, K.H., Im, Y.T. (2002) Numerical Simulation of Three-Dimensional Fiber Orientation in Short-Fiber-Reinforced Injection-Molded Parts, Journal of Materials Processing Technology, 124, pp.366-371 https://doi.org/10.1016/S0924-0136(02)00255-8
  12. Jeffery, G.B. (1922) The Motion of Ellipsoidal Particles Immersed in a Viscous Fluid, Proceeding of Royal Society of London A, 102, pp.161-179 https://doi.org/10.1098/rspa.1922.0078
  13. Lin, J.Z., Sun, K., Zhang, W. (2008) Orientation Distribution of Fibers and Rheological Property in Fiber Suspensions Flowing in a Turbulent Boundary Layer, Acta Mech Sin, 24, pp.243-250 https://doi.org/10.1007/s10409-008-0152-3
  14. Moses, K.B., Advani, S.G., Reinhardt, A. (2001) Investigation of Fiber Motion near Solid Boundaries in Simple Shear Flow, Rheol Acta, 40, pp.296-306 https://doi.org/10.1007/s003970000135
  15. Naaman, A.E., Reinhardt, H.W. (1995) Characterization of High Performance Fiber Reinforced Cement Composites-HPFRCC, Proceedings of the Second International Workshop 'HPFRCD2', pp.3-6
  16. Poitou, A., Chinesta, F., Bernier, G. (2001) Orienting Fibers by Extrusion in Reinforced Reactive Powder Concrete, Journal of Engineering Mechanics, 127(6), pp.593-598 https://doi.org/10.1061/(ASCE)0733-9399(2001)127:6(593)
  17. Shah, S. P., Ouyang, C. (1991) Mechanical Behavior of Fiber-reinforced Cement-based Composites, Journal of American Ceramic Society, 74(11), pp.2727-2738 https://doi.org/10.1111/j.1151-2916.1991.tb06836.x
  18. Vincent, M., Delivers, E., Agassant, J.F. (1997) Fiber Orientation Calculation in Injection Moulding of Reinforced Thermoplastics, Journal of Non-Newtonian Fluid Mechanics, 73, pp.317-326 https://doi.org/10.1016/S0377-0257(97)00048-7