TOOLED THICK COMPOSITES by ARVEN H. SAUNDERS III ...

Boundary Conditions
HR
HR
HR
V
R
CV
V
R
CV
V
R
CV
Boundary Conditions
HR
HR
HR
V
R
CV
V
R
CV
V
R
CV
Figure 3-9. Flow Resistance Network Representing the Laminate.
where Visc(i, j) is the CV resin viscosity, permL(i, j) is CV longitudinal permeability, permT(i, j) is
CV transverse permeability, dx is the typical distance x-wise between the CVs, Abs(Z(i, j) - Z(i, j
+ 1)) is the vertical distance between the CVs, and FlowHgt(i,j) is the common CV height
between CV(i,j) and CV(i+1,j). Note that the HR values incorporate longitudinal permeability and
VR values incorporate transverse permeability. The cross-sectional area (flow channel) through
which resin can flow between 2 adjacent CVs is the flow height * dy. Since resin viscosity may
differ for the 2 CVs involved due to temperature effects, the average viscosity of the 2 CVs is
used for the resin flow between them. The more restrictive minimum permeability between the 2
adjacent CVs value is used.
The resin flow for the contact areas is assumed to follow across, with flow moving to the
left and right from the x-wise center/mid CV to each edge. The resistance to resin flow depends
on the state of all the CVs the resin must pass through on its way out. This is analogous to 2
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HR
HR
HR
V
R
CV
V
R
CV
V
R
CV
HR
HR
HR
Boundary Boundary Conditions Conditions