ConstitutiveLaws
From Yade
This page is obsoleted. For reference, see sphinx documentation at https://www.yade-dem.org/sphinx/yade.wrapper.html#constitutive-laws.
This page should grow to give overview of all constitutive laws (a.k.a. InteractionSolvers) and interaction-related classes in Yade. The purpose is twofold:
- Names of respective classes do not say much and it seems that lot of code is duplicated; should improve orientation in material models available
- Have overview of migration to ConstitutiveLawDispatcher and ConstitutiveLaw (moving the interaction loop away from the law code), removal of persistentInteraction and obsolete code.
Please add what you know something about.
Constitutive laws
| Class | description | interactionGeometry | interactionPhysics | used by and where |
|---|---|---|---|---|
| ElasticContactLaw | (the traditional Cundall's elastic-plastic law) This law has three parameters : tangential stiffness, normal stiffness, and friction coefficient - it modelises dry contacts (no tensile force allowed). | SpheresContactGeometry | ElasticContactInteraction | TriaxialTest (Bruno Chareyre) |
| CohesiveFrictionalContactLaw | A versatile elastic-plastic contact law, with shear/normal/twisting/rolling stiffnesses, normal/shear strength (twisting/rolling strength could be added easily, for now they are infinite), shear/twisting creep | SpheresContactGeometry | CohesiveFrictionalInteraction | CohesiveTriaxialTest (Bruno Chareyre/Cosurgi) |
| Concrete particle model (Cpm) | material model developed for concrete. It has damage, plasticity (friction), visco-damage (and visco-plasticity). The code unfortunately cannot be disclosed by contract, but algorithms will be published some day. | Dem3DofGeom | CpmPhys | scripts (eudoxos) |
| ef2_Spheres_NormalShear_ElasticFrictionalLaw | Proof-of-concept for ConstitutiveLawDispatcher. Cohesive type of interaction; has elasticity in both normal and shear directions. | SpheresContactGeometry | NormalShearInteraction | scripts/constitutive-law.py (eudoxos) |
| ElasticContactLaw2 | like ElasticContactLaw, but using geometry algorithms in SpheresContactGeometry instead of computing that in-place; demonstrative only | SpheresContactGeometry | ElasticContactInteraction | (eudoxos) |
| ElasticCohesiveLaw (deprecated) | inherited from SDEC, not used anywhere except SDECLinkedSpheres | SDECLinkGeometry | SDECLinkPhysics | to be removed (relies on persistentInteractions)? |
| Spheres_Viscoelastic_SimpleViscoelasticContactLaw | Linear spring−dashpot contact model | SpheresContactGeometry | ViscoelasticInteraction | (sega) for dynamic simulation |
| RockJointLaw | Inelastic normal behaviour (kn_unload # kn_load); transfert of an elastic-plastic moment; no cohesion or tensile limit | SpheresContactGeometry | RockJointPhys | J. Duriez for simulations of "SimpleShear" Preprocessor (a simple shear box for studying rock joints) |
| Law2_ScGeom_CapillaryPhys_Capillarity | This law allows to take into account capillary forces/effects between spheres coming from the presence of interparticular liquid bridges (menisci). The law needs ascii files M(r=i) to work (see https://yade-dem.org/index.php/CapillaryTriaxialTest). These ASCII files contain a set of results from the resolution of the Laplace-Young equation for different configurations of the interacting geometry. | SpheresContactGeometry | CapillaryPhys | L. Scholtes for simulation of unsaturated granular materials (e.g. TriaxialTestWater) |
| add your stuff here, please! | ... | ... | ... |
InteractionPhysicsFunctors
| Class | description | material | interactionPhysics | remarks |
|---|---|---|---|---|
| Ip2_CpmMat_CpmMat_CpmPhys | from the Cpm family; elastic, damage, plasticity, viscosity properties | CpmMat | CpmPhys | (eudoxos) |
| SimpleElasticRelationships | ... | ... | ... | |
| SimpleViscoelasticRelationships | From viscoelastic parameters of the pair bodies provides viscoelastic parameters of their interaction by the rule of consecutive connection. | SimpleViscoelasticBodyParameters | ViscoelasticInteraction | (sega) |
| RockJointLawRelationships | Computes all the attributes of "RockJointPhys" used for application of RockJointLaw | CohesiveFrictionalBodyParameters | RockJointPhys | J. Duriez for SimpleShear |
| Ip2_FrictMat_FrictMat_CapillaryPhys | computes all the elastic attributes for CapillaryPhys (duplicates Ip2_FrictMat_FrictMat_FrictPhys) | Frictmat | CapillaryPhys | Luc Scholtes |
InteractionGeometry
| Class | description | |
|---|---|---|
| SpheresContactGeometry | used almost everywhere in the DEM code, even for sphere-box contacts. | |
| SDECLinkGeometry | duplicated SpheresContactGeometry. (Should be removed) | |
| ... | ..... |
InteractionPhysics
| Class | description | |
|---|---|---|
| NormalInteraction | abstract class that has only normal stiffness and force | |
| NormalShearInteraction | abstract class with normal and shear stiffnesses | |
| CpmPhys | normal and shear physics with additional parameters for non-elastic domain. | |
| ViscoelasticInteraction | elastic contact with additional parameters for normal and shear dashpot. | |
| RockJointPhys | ||
| CapillaryPhys | parameters linked to the definition of a capillary bridge between 2 spheres (Volume,Force,extents over grains surfaces). |