# Workpiece Material Properties

The Workpiece material is used to describe the extrudate in metal extrusion. Typically, this material is applied to the components in the mesh that describe the negative volume created by the tool (such as, billet, pockets, feeder cavity, welding chamber, porthole etc.) Inside the user profile, we assign this material even to the boundary faces of the workpiece components. HyperXtrude supports the following constitutive models for metals:

- Inverse Sine Hyperbolic model
- Metal Forming Power Law model
- Norton-Hoff model
- Hensel Spittel model

## Workpiece Material Properties Data Types

Variable Name | Value Type | Remarks |
---|---|---|

ConstitutiveModel | String in quotes | "SineHypInv" "PowerLaw" "TemDependentNortonHoff" |

Density | Real (Constant) | Density of the fluid |

SpecificHeat | Real(Constant/Function of Temp.) | Function can be a TABLE1 or EXPRESSION |

Conductivity | Real (Constant/Function of Temp.) | Function can be a TABLE1 or EXPRESSION |

CoeffOfThermalExpansion | Real (Constant) | Value per unit volume |

SolidusTemperatureLiqidusTemeprature | Real (Constant) Real (Constant) | Friction coefficient decreases from its full value at Solidus Temperature to zero at LiqidusTemperature |

Temperature Dependence | String in quotes | "None "Coefficient" "exp (Q/RT)" "Exp(-Beta(DeltaT))" "Exp(A1T+A2T^2)" |

Amplitude ConstantY | Real (Constant/Function of Temp.) | Only for PowerLaw with "Coefficients" for Temperature Dependence |

Other Data | Real (Constant) | Data specific to different material models is described in the following sections. |