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ADVANCED MANUFACTURING: POLYMER & COMPOSITES SCIENCE 43 Figure 6. Transverse permeability as a function of time at (a) room temperature; (b) 40C; (c) 50C; (d) 60C; and (e) 70C for PW laminates. with increasing ply number. For a 4-ply laminate, the permeability was $1 1014 m2, while for a 24-ply laminate, the permeability decreased by $50 times to $2 1016 m2. The decrease arises because through- thickness gas flow occurs predominately via open pores at tow bundle intersections (Figure4(b)). As ply number increase, these open channels in the laminate do not align, resulting in decreased permeability. After the 4-hour RT debulk, the transverse per- meability decreased by $2 and 3 orders of magni- tude in all cases (Figure 6(a)). The reduction in permeability was attributed to fiber bed compaction, ply nesting, and the redistribution of resin and air pathways [15]. When the debulk temperature increased to 40 C, resin viscosity decreased ten-fold (from 6.5 104 Pas to 4.7 103 Pas), while thePDF Image | VACUUM BAGGING SUPPLIES Peel Ply Fabric
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