Radial flow permeability measurement. Part B: Application

Understanding variability in the permeability of non-crimp fabric composite reinforcements

“…The fl ow front propagation along three co-planar axes was determined by evaluating the readings from an array of pressure transducers (Endruweit et al , 2006c). Implementation of a method derived by Weitzenböck et al (1999aWeitzenböck et al ( , 1999b from Eqs. 9.8 to 9.10 allows the principal permeability values and the orientation of the principal permeability axes to be determined from the fl ow front position as a function of time.…”

Permeability of non-crimp fabric preforms

“…The theory to extract permeabilities from the measured quantities such as the fl ow-front position, pressure gradient and/or volumetric fl ow, is beyond the scope of this book. The reader is referred to other literature for theory and comparison of both technologies (Ferland et al , 1996;Han et al , 2000;Heardman et al , 2004;Lekakou et al , 1996;Lundström et al , 1999Lundström et al , , 2002Wang et al , 1994;Weitzenböck et al , 1999aWeitzenböck et al , , 1999b. The main characteristics of the measuring methods are listed in Table 8.1 .…”

Relationships between the glass fibre sizing composition and the surface quality of sheet moulding compounds (SMC) body panels

“…A lot of researches were focused on the measurements of the permeability of glass fibre mats used for resin transfer molding (RTM) applications [20][21][22][23][24][25][26][27][28][29][30][31][32][33]. In this case, Darcy law was used and applied for a Newtonian flow:…”