**YieldStress** | Y | A measure of the yield stress (or characteristic 0.2 percent proof stress) of the material. | Number |

**UltimateStress** | U | A measure of the ultimate stress of the material. | Number |

**UltimateStrain** | S | A measure of the (engineering) strain at the state of ultimate stress of the material. | Number |

**HardeningModule** | H | A measure of the hardening module of the material (slope of stress versus strain curve after yield range). | Number |

**ProportionalStress** | P | A measure of the proportional stress of the material. It describes the stress before the first plastic deformation occurs and is commonly measured at a deformation of 0.01%. | Number |

**PlasticStrain** | S | A measure of the permanent displacement, as in slip or twinning, which remains after the stress has been removed. Currently applied to a strain of 0.2% proportional stress of the material. | Number |

**Relaxations** | R | Measures of decrease in stress over long time intervals resulting from plastic flow. Different relaxation values for different initial stress levels for a material may be given. It describes the time dependent relative relaxation value for a given initial stress level at constant strain. Relating values are the 'RelaxationValue'. Related values are the 'InitialStress' | Number |

**Stress Units** | U | Stress Units | Integer |