Manufacturing Solutions

# Material Data - Preform

There are three materials involved in the filling process, they are the Preform, resin and air. Preform is modeled as a porous media. The MATERIALS data packet specifies the Preform data.

BEGIN MATERIALS

PorousMediaProps Material_name {

Permeability_X = K_x

Permeability_Y = K_y

Permeability_Z = K_z

Porosity = Value

Residual_Resin_Satn = Value

Residual_Air_Satn = Value

Initial_Resin_Satn = Value

Relperm_curve = ( 1 | 2 | 3 )

Compressibility = Value

Density = Value

Conductivity_X = k_x

Conductivity_Y = k_y

Conductivity_Z = k_z

SpecificHeat = Value

}

END

• | Permeability tensor is orthotropic and its units are m2. Data can be specified using a table or function. Depending on the mat type, values are in the range, 10-8 to 10-12. |

• | Porosity is the complement of fiber volume fraction, indicating pore volume space. This is a dimensionless variable. |

• | Saturation is always expressed in terms of the resin’s saturation. Residual saturation of resin should be 0.0, that is, there is no resin residue in material by default. Residual saturation of air should be 1.0, as this implies all the air in the preform can be removed. |

• | There are three different functions available for the relative permeability curve. These curves specify how the presence of resin influences the permeability of air and the vice versa. |

- | Linear |

- | Quadratic |

- | Experimental |

• | Density, thermal conductivity and the specific heat are required only for non-isothermal analysis. Preform is treated as an orthotropic material with respect to heat conduction. |

• | All units are in S.I. unless specified to the contrary. |

BEGIN MATERIALS

PorousMediaProps random_mat {

Permeability_X = 1.0E-09

Permeability_Y = 1.0E-09

Permeability_Z = 1.0E-09

Porosity = 0.70

Residual_Resin_Satn = 0

Residual_Air_Satn = 1

Initial_Resin_Satn = 0

RelPerm_Curve = 2

Density = 2700.0

Conductivity_X = 0.04

Conductivity_Y = 0.04

Conductivity_Z = 0.04

SpecificHeat = 2000

}

END

## Variable |
## Default Value |
## Valid Range |
## Data Type |
## Significance |

Permeability_X |
1.0e-08 |
1.0e-04 - 1.0e-15 |
Constant or Function of time |
Permeability in the X direction |

Permeability_Y |
1.0e-08 |
1.0e-04 - 1.0e-15 |
Constant or Function of time |
Permeability in the Y direction |

Permeability_Z |
1.0e-08 |
1.0e-04 - 1.0e-15 |
Constant or Function of time |
Permeability in the Z direction |

Porosity |
0.60 |
0.1 - 0.9 |
Constant or function of time |
Porosity = 1 - fiber volume fraction |

Residual_Resin_Satn |
0.0 |
0.0 - 1.0 |
Constant or function of x and y |
Default value should be fine for RTM/ZPM |

Residual_Air_Satn |
1.0 |
0.0 - 1.0 |
Constant or function of x and y |
Default value should be fine for RTM/ZPM |

Initial_Resin_Satn |
0.0 |
0.0 - 1.0 |
Constant or function of x and y |
Default value should be fine for RTM/ZPM |

Relperm_Curve |
2 |
1 - 5 |
Constant |
1 - Quadratic 2 - Linear 3 - VARTM 4 - Digital 5 - User If you specify 5, then you should also specify the PROBLEMDATA type RelPerm |

PoreSize |
1.0e - 04 |
-1 or average poresize |
Constant |
Use -1 to compute shear rate based on Darcy's velocity field. A valid non-zero value would lead to shear rate calculation based on pore size. |

Density |
1000.0 |
Positive value |
Constant or function of time |
Density of the preform |

Conductivity_X |
0.04 |
Positive value |
Constant or function of time |
Thermal conductivity of the preform in X direction |

Conductivity_Y |
0.04 |
Positive value |
Constant or function of time |
Thermal conductivity of the preform in Y direction |

Conductivity_Z |
0.04 |
Positive value |
Constant or function of time |
Thermal conductivity of the preform in Z direction |

SpecificHeat |
2000.0 |
Positive Value |
Constant or function of time |
Specific heat of the preform |