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Table of Contents
Contact elements
Contact[2|3]DElement
For rigid-defo contact: Contact[2|3]DElement defines contact between a rigid entity under a given displacement (unmeshed geometric entity) and a meshed geometric entity which is part of the surface of the mesh. This element is therefore a one node element, called the slave, having 2/3 dofs in 2/3D.
For defo-defo contact: Contact[2|3]DElement defines contact between two meshed geometric entities, both part of the surface of the mesh. This element associates one node to a set of edges or faces.
Parameters
| Name | Metafor Code | Dependency |
|---|---|---|
MATERIAL | Number of the contact material to consider | - |
STIFFMETHOD | Method used to compute the stiffness matrix = STIFF_ANALYTIC : analytic matrix (default)= STIFF_NUMERIC : numerical matrix | - |
AREAINCONTACT |
= AIC_NO : Traditional penalty : Force = Penalty * gap (by default but not recommended)
= AIC_USER : Pondered penalty : Force = Penalty * gap * “Slave node surface given by the user using USERCONTACTAREA property”
= AIC_ONCE : Pondered penalty : Force = Penalty * gap * “Slave node surface computed based on initial configuration” (
recommended in most cases)
= AIC_ONCEPERSTEP : Pondered penalty : Force = Penalty * gap * “Slave node surface computed at the beginning of each time step, so based on previous configuration at equilibrium (to use if friction depends on the contact area, for example using Tresca's law)
= AIC : Pondered penalty : Force = Penalty * gap * “Node contact surface computed for each mechanical iteration”| - |
USERCONTACTAREA | Property used to define the constant contact area in the AIC_USER configuration | |
AREAINCONTACTMETHOD | Method used to compute the slave node surface used to ponder contact forces = AICM_GEOPHYS, 0 : the calculation of the area is based on a geometrical approach in the physical space (by default).= AICM_GEOREF, 1 : the calculation of the area is based on a geometrical approach in the reference space.= AICM_CONS, 2 : the calculation of the area is based on an energy approach. | - |
PRECONNORMALGAP | Accuracy set on the normal gap when using the augmented Lagrangian. By default, no value since the method is deactivated. | - |
PRECONTANGENTGAP | Accuracy set on the tangential gap when using the augmented Lagrangian. By default, no value since the method is deactivated. | - |
Tm[2]Contact[2|3]DElement
Thermomechanical contact element for rigid-defo or defo-defo, of the first or second order. Same as ContactElement but with a thermal field.
:!:Second order thermomechanical elements are not tested:!:
Parameters
| Name | Metafor Code | Dependency | |
|---|---|---|---|
MATERIAL | Number of the contact material to consider | - | |
STIFFMETHOD | Method used to compute the stiffness matrix = STIFF_ANALYTIC : analytic matrix (default)= STIFF_NUMERIC : numerical matrix | - | |
AREAINCONTACT | Parameter to taken into account the surface associated to a slave node to ponder contact forces : Force = Penalty * gap * Area = AIC_NO : Area = 1.0 (by default but not recommended) = AIC_USER : Area = value given in USERCONTACTAREA property = AIC_ONCE : Area = “Slave node surface computed based on initial configuration” ( recommended in most cases) = AIC_ONCEPERSTEP : Area = “Slave node surface recomputed at the beginning of each time step (take into account Slave node surface variations using an explicit scheme (to use if friction depends on the contact area, for example using Tresca's law) | - | |
USERCONTACTAREA | Contact Area Value for AIC_USER case | - | |
PRECONNORMALGAP | Accuracy set on the normal gap when using the augmented Lagrangian. By default, no value since the method is deactivated. | - | |
PRECONTANGENTGAP | Accuracy set on the tangential gap when using the augmented Lagrangian. By default, no value since the method is deactivated. | - | - |
TOOLTEMP | Temperature of the tool in a rigid-defo configuration ( By default, 293.0K ) | time |