Aerospace & Automotive Composite Manufacturing
LCM & RTM Resin Flow Permeability Calculator
Precision Darcy porous media flow solver for Resin Transfer Molding (RTM), HP-RTM, and vacuum infusion composite manufacturing.
1. Input Parameters
Target fiber packing volume in mold cavity
Epoxy / Vinyl ester injection viscosity (typical 50 - 300 cP)
Injection gate pressure minus vacuum vent backpressure
Distance from resin injection port to furthest vent line
2. Calculation Results
Effective Porosity (φ)
0.450
Calibrated Permeability (K)
1.28e-11 m²
Total Mold Fill Time (t_fill)
38.4 s
Average Flow Velocity (v_avg)
20.8 mm/s
Micro-Void Risk Index
Low (Capillary Match)
Required Clamping Force
144.0 kN (14.7 T)
3. Dynamic Visualizer & CAM Preview
4. Engineering Notes & Physics Specifications
Resin Transfer Molding (RTM) and High-Pressure RTM (HP-RTM) rely on Darcy's Law for anisotropic porous media flow to model resin impregnation through dry fiber preforms.
- Darcy's Law 1D Fill Time: Total rectilinear fill time is calculated by integrating Darcy flow across length $L$: $$t_{\text{fill}} = \frac{\mu \phi L^2}{2 K \Delta P}$$ where $\mu$ is dynamic viscosity, $\phi = 1 - V_f$ is preform porosity, $K$ is fiber permeability, and $\Delta P$ is net injection pressure.
- Kozeny-Carman Permeability Scaling: Fiber permeability scales non-linearly with fiber volume fraction: $K(V_f) = K_0 \frac{(1-V_f)^3}{V_f^2}$.
- Tooling Vector DXFs: Perimeter vacuum seal channels, silicone pinch lands, and resin injection runner grooves must be mathematically offset from preform edge geometry with zero leak-by channels.
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