The rapid manufacturing of composite parts by liquid molding containing foam cores introduces potential processing issues that could lead to degradation in part quality and performance. This paper addresses the key issue of the flow-induced foam core deformation and its effect on the molding pressure. A set of molding experiments are carried out to investigate mechanisms linked to the foam core and fabric deformation during the filling stage. A simplified two-dimensional model is proposed to predict the pressure evolution resulting from the combined deformation of foam core and the fabrics. Computed results show reasonable agreement with the experimental results.
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References
1.
1. Karlsson, K.F. and Aström, B.T. (1997). Manufacturing and Applications of Structural Sandwich Components , Composites Part A, 28A: 97-111 .
2.
2. Al-Hamdan, Mo., Rudd, C.D. and Long, A.C. (1998). Dynamic Core Movements During Liquid Composite Molding of Sandwich Structures , Composites Part A, 29A: 273-283 .
3.
3. Wirth, So., Gauvin, R. and Kendall, K. (1998). Experimental Analysis of Core Crushing and Core Movement in RTM and SRIM Foam Cored Composites Parts , Journal of Reinforced Plastics and Composites, 17(11): 964-988 .
4.
4. Lebrun, G., Gauvin, R. and Kendall, K.N. (1996). Experimental Investigation of Resin Temperature and Pressure During Filling and Curing in a Flat Steel RTM Mould , Composites - Part A: Applied Science and Manufacturing, 27(5): 347-355 .
5.
5. Pillai, K.M. and Advani, S.G. (1998). Model for Unsaturated Flow in Woven Fiber Preforms During Mold Filling in Resin Transfer Molding , Journal of Composite Materials, 32(19): 1753-1783 .
6.
6. Lin, R., Lee, L.J. and Liou, M.J. (1991). Nonisothermal Mold Filling in Resin Transfer Molding and Structural Reaction Injection Molding , In Search of Excellence, Annual Technical Conference - ANTEC, Conference Proceedings, Vol. 37, pp. 815-818 .
7.
7. Advani, S.G., Bruschke, M.V. and Parnas, R. (1994). Resin Transfer Moulding Flow Phenomena in Polymeric Composites. In: Advani, S.G. (Ed.), Flow and Rheology in Composite Manufacturing, Chapter 12, pp. 465-515, Elsevier Science .
8.
8. Preziosi, L., Joseph, D.D. and Beavers, G.S. (1996). Infiltration of Initially Dry Deformable Porous Media , Int. J. Multiphase Flow, 22(6): 1205-1222 .
9.
9. Ambrosi, D. and Preziosi, L. (1998). Modelling Matrix Injection Through Elastic Porous Preforms , Composites Part A, 29A: 5-18 .
10.
10. Gauvin, R., Trochu, F., Lemenn, Y. and Diallo, L. (1996). Permeability Measurement and Flow Simulation Through Fiber Reinforcements , Polymer Composites, 17(1): 34-42 .
11.
11. Bruschke, M.V. and Advani, S.G. (1990). A Finite Element/Control Volume Approach to Mold Filling in Anisotropic Porous Media , Polym. Comp., 11: 398-405 .
12.
12. Han, K., Lee, James and Liou, Ming (1993). Fiber Mat Deformation in Liquid Composite Molding, II: Modeling , Polymer Composites, 14(2): 151-160 .
13.
13. Gupte, S. and Advani, S.G. (1997). Non-Darcy Flow Near the Permeable Boundary of a Porous Medium: An Experimental Investigation Using LDA , Experiments in Fluids, 22: 408-422 .
14.
14. Beavers, G.S. and Joseph, D.D. (1967). J. Fluid Mech., 30(1): 197 .
15.
15. Brushke, M.V. and Advani, S.G. (1993). Flow of Generalized Newtonian Fluids Across a Periodic Array of Cylinders , J. Rheol., 37: 479-498 .
16.
16. Simacek, P. and Advani, S.G. (1996). Permeability Model for a Woven Fabric , Polymer Composites, 17: 887-889 .
24. Pham, X.T. and Trochu, F. (2000). Analysis of the Consolidation in Flexible Bladder Process for Thin Composites Parts by Finite Element Method , Journal of Reinforced Plastic and Composite, 19(3): 182-218 .
25.
25. Radius Engineering Inc., 3474 South 2300 East, Salt Lake City, Utah 84109.
