STUDY ON PERMEABILITY PREDICTING FORMULA OF FIBER BUNDLES AND NON-CRIMPED FABRICS

Abstract

Abstract: The results of CFD (Computational Fluid Dynamics) was applied to modify the Gebart formula to predict the permeability of fiber bundles. The relationship between permeability and structure parameters of non-crimp fabrics (NCF) was inverstigated and the permeability predicting formula of NCF was obtained. The numerical and modified formula′s results of flow parallel to fiber bundles were closer to the experimental results than the Gebart formula′s results, especially at high porosity. The error between the numerical and experimental results of the NCF unit cell is 5%. Orthogonal experimentals were carried out on NCF composed of fiber bundles with 5 different porosities. The permeability predicting formula of NCF was fitted on the basis of the numerical results of orthogonal tests. The average errors between the numerical and predicting formula′s results were 4.60% for quadratic arrangement and 4.57% for hexagonal arrangement, which verified the accuracy of the permeability predicting formula.

Key words: RTM, fiber bundles, non-crimped fabrics, permeability

CLC Number:

TB332

KANG Ning, LIANG Xuan-yong. STUDY ON PERMEABILITY PREDICTING FORMULA OF FIBER BUNDLES AND NON-CRIMPED FABRICS[J]. Fiber Reinforced Plastics/Composites, 2016, 0(7): 20-25.

References

[1] 齐文, 刘东, 赵俊利, 等. RTM工艺充模过程模拟研究进展[J]. 玻璃钢/复合材料, 2015(12): 105-109.
[2] Gebart B R. Permeability of unidirectional reinforcements for RTM[J]. Composite Materials, 1992, 26(8): 1100-1133.
[3] 李嘉禄, 吴晓青, 冯驰. RTM中纤维渗透率预测的研究进展[J]. 复合材料学报, 2006, 23(6): 1-8.
[4] Happel J. Viscous flow relative to arrays of cylinders[J]. American Institute of Chemical Engineers Journal, 1959, 5: 174-177.
[5] Kawabura S. The force experienced by randomly distributed parallel circular cylinders or spheres in a viscous flow at small Reynolds numbers[J]. Journal of the Physics Society of Japan, 1959, 14: 527-532.
[6] Bruschke M V, Advani S G. Flow of generalized Newtonian fluids across a periodic array of cylinders[J]. Journal of Rheology, 1993, 37(3): 479-498.
[7] Lundstrm T S. The permeability of non-crimp stitched fabrics[J]. Composites: Part A, 2000, 31(9): 1345-1353.
[8] Noudlund M, Lundstrm T S. Numerical study of the local permeability of non-crimp fabrics[J]. Journal of Composite Materials, 2005, 39(10): 929-947.
[9] 何海东, 贾玉玺, 丁妍羽, 等. 无弯曲纤维织物面内渗透率的结构相关性[J]. 复合材料学报, 2011, 28(5): 70-76.
[10] Lekakou C, Edwards S, Bell G, et al. Computer modelling for the prediction of the in-plane permeability of non-crimp stitch bonded fabrics[J]. Composites: Part A, 2006, 37(6): 820-825.
[11] Sadiq T A K, Advani S G, Parnas R S. Experimental investigation of transverse flow through aligned cylinders[J]. International Journal of Multiphase Flow, 1995, 21(5): 755-774.
[12] Bergelin O P, Brown G A, Hull H L, et al. Heat transfer and fluid friction during viscous flow across banks of tubes: Ⅲ-a study of tube spacing and tube size[J]. ASME Trans., 1950, 72: 881-888.
[13] Kirsch A A, Fuchs N A. Studies on fibrous Aerosol Filters-Ⅱ: Pressure Drops in Systems of Parallel Cylinders[J]. Ann. Occup. Hyg., 1967, 10: 23-30.
[14] Ingmanson W L, Andrews B D, Johnson R C. Internal Pressure Distributions in Compressible Mats Under Fluid Stress[J]. TAPPI, 1949, 42: 840-849.
[15] Skartsis L, Kardos J L. The Newtonian permeability and consolidation of oriented carbon fiber beds[J]. Proceedings of American Society of Composites Technical Conference, 1990, 548-556.