Decreasing the amount of residual voids during the resin infiltration into fibrous porous media is an important aspect in manufacturing high performance composite materials.In order to better understand void transports and flow behaviors in filling process,which affects immediately the final void content,a finite-element scheme for transient simulations of the void migration in a transverse flow through the uniaxial micro-structured fibrous media is developed in this work.A volume-of-fluid (VOF) method has been incorporated in the Eulerian frame to capture the free surface of the resin flow.The implementation of periodic boundary condition to the vertical direction avoids unwanted wall effect.The void migration in a dual-scale fiber tow model was investigated.The voids are observed to be transported through the inter-tow region as well as entrapped into fiber tow.It is that the motion of void lagged behind macro flow front which implies that the adequate resin bleeding after mold filling is crucial to remove the entrapped air.
参考文献
| [1] | Bader MG. .Polymer composites in 2000: structure, performance, cost and compromise[J].Journal of Microscopy,2001(Pt.2):110-121. |
| [2] | Varna J;R.Joffe;L.A.Berglund .Effect of voids on failure mechanisms in RTM laminates[J].Composites Science and Technology,1995,53:241-249. |
| [3] | Mallick P.K.Fiber-reinforced composites:materials,manufacturing and design[M].Boca Raton,Florida:CRC Press,2008 |
| [4] | Patel N;L.J.Lee .Modeling of void formation and removal in liquid composite molding.Part Ⅰ[J].Polymer Composites,1996,17:96-103. |
| [5] | E. Ruiz;V. Achim;S. Soukane .Optimization of injection flow rate to minimize micro/macro-voids formation in resin transfer molded composites[J].Composites science and technology,2006(3/4):475-486. |
| [6] | Kanga M.K.;Leea W.I. .Formation of microvoids during resin-transfer molding process[J].Composites science and technology,2000(12/13):2427-2434. |
| [7] | Rohatgi V;N.Patel;L.J.Lee .Experimental investigation of flow-induced microvoids during impregnation of unidirectional stitched[J].Polymer Composites,1996,17:161-170. |
| [8] | Youssef K. Hamidi;Levent Aktas;M. Cengiz Altan .Three-dimensional features of void morphology in resin transfer molded composites[J].Composites science and technology,2005(7/8):1306-1320. |
| [9] | Chih-Hsin Shih;L.James Lee .Analysis of void removal in liquid composite molding using microflow models[J].Polymer Composites,2002(1):120-131. |
| [10] | Kang K;K.Koelling .Void transport in resin transfer molding[J].Polymer Composites,2004,25:417-433. |
| [11] | Wang JF;Hwang WR .Permeability prediction of fibrous porous media in a bi-periodic domain[J].Journal of Composite Materials,2008(9):909-929. |
| [12] | Haagh G.A.A.V;F.N.Van De Vosse .Simulation of threedimensional polymer mould filling proeesses using a peseudo-concentration method[J].International Journal for Numerical Methods in Fluids,1998,28:355-1369. |
| [13] | Glowinski R;Hesla TI;Joseph DD;Pan T-W .Distributed Lagrange multiplier/fictitious domain method for particulate flows[J].International Journal of Multiphase Flow,1999(5):755-794. |
| [14] | F. Bertrand;P. A. Tanguy;F. Thibault .A three-dimensional fictitious domain method for incompressible fluid flow problems[J].International Journal for Numerical Methods in Fluids,1997(6):719-736. |
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