====== Thixotropic materials ======

===== ThixoEvpIsoHHypoMaterial =====

=== Description ===

Elasto-visco-plastic law with nonlinear hardening, temperature set in a way specific for thixotropic materials.

Stresses are integrated with a radial return method. The stiffness tangent matrix is analytic and numerical

The yield stress must verify the constraint:

$$
f=\overline{\sigma}-\sigma_{yield}=0
$$

where $ \overline{\sigma}$ is the equivalent stress computed and $ \sigma_{yield} $ is a [[doc:user:elements:volumes:yield_stress|yield stress specific for thixotropic materials]].

=== Parameters ===
^   Name                                             ^     Metafor Code     ^  Dependency ^
| Density                                              |   ''MASS_DENSITY''       |    -     |
| Young modulus                                        |  ''ELASTIC_MODULUS''     |  ''TM''  |
| Poisson ratio                                        |   ''POISSON_RATIO''      |    -     |
| Thermal expansion                                    |  ''THERM_EXPANSION''     |  ''TM''  |
| Number of the material law which defines the yield stress $\sigma_{yield}$|    ''YIELD_NUM''     |    -     |
| Evolution law of the material temperature            |       ''TEMP''           |  ''TM''  |
| Number of the plastic criterion  \\ (by default, a ''VonMisesPlasticCriterion)'' | ''PLASTICCRITERION_NUM'' |    -     |
| Objectivity Method  \\ (Jaumann = 0, GreenNaghdi = 1)|    ''OBJECTIVITY''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX1_X''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX1_Y''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX1_Z''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX2_X''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX2_Y''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX2_Z''       |    -     |

===== ThixoTmEvpIsoHHypoMaterial =====

=== Description ===

Same as ''ThixoEvpIsoHHypoMaterial'' but including thermal effects.

=== Parameters ===
^   Name                                             ^     Metafor Code     ^  Dependency ^
| Solid phase density                                                                       |   ''MASS_DENSITY''       |      ''TO/TM''       |
| Liquid phase density                                                                      |   ''MASS_DENSITY_LIQ''       |      ''TO/TM''       |
| Young modulus                                                              |  ''ELASTIC_MODULUS''     |      ''TO/TM''       |
| Poisson ratio                                                          |   ''POISSON_RATIO''      |      ''TO/TM''       |
| Thermal expansion                                                         |  ''THERM_EXPANSION''     |      ''TO/TM''       |
| Number of the material law which defines the yield stress  $\sigma_{yield}$   |      ''YIELD_NUM''       |    -     |
| Conductivity                                                                 |    ''CONDUCTIVITY''      |      ''TO/TM''       |
| Solid phase heat capacity                                             |   ''HEAT_CAPACITY''      |      ''TO/TM''       |
| Solid phase heat capacity                                             |   ''HEAT_CAPACITY_LIQ''      |      ''TO/TM''       |
| Dissipated thermoelastic power fraction                               |     ''DISSIP_TE''        |          -           |
| Dissipated (visco)plastic power fraction (Taylor-Quinney factor)  |     ''DISSIP_TQ''        |          -           |
| Latent heat                                            |   ''LATENT_HEAT''      |      ''  /  ''       |
| Number of the plastic criterion  \\ ((by default, ''VonMisesPlasticCriterion)''| ''PLASTICCRITERION_NUM'' |    -     |
| Objectivity method  \\ (Jaumann = 0, GreenNaghdi = 1)|    ''OBJECTIVITY''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX1_X''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX1_Y''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX1_Z''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX2_X''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX2_Y''       |    -     |
| Orthotropic axis                                     |    ''ORTHO_AX2_Z''       |    -     |