FEM ConstraintContact/ro
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| poziția meniului |
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| Model → Mechanical Constraints → Constraint contact |
| Ateliere |
| FEM |
| scurtătură |
| Nici unul |
| Prezentat în versiune |
| - |
| A se vedea, de asemenea, |
| FEM tutorial |
Descriere
Creează o constrângere MEF pentru contactul între două suprafețe.
The FEM contact task panel
Cum se folosește
- Click pe
sau alegeți Model → Mechanical Constraints → Constraint contact din meniul de us. - Select the master face.
- Select the slave face.
- Enter a contact stiffness.
- Enter a friction coefficient.
Contact example - rigid cube pressed against and sliding on a deformable block. Without contact definition, those two parts wouldn't "see" each other.
Limite
- Constrângerea de contact poate fi aplicată numai la două fețe.
Properties
- DateSlope: Contact stiffness.
- DateAdjust - introduced in 1.0: Node clearance adjustment limit.
- DateFriction - introduced in 1.0: Enable frictional contact.
- DateFriction Coefficient: Coefficient of friction.
- DateStick Slope - introduced in 1.0: Stick slope.
- DateEnable Thermal Contact - introduced in 1.1: Enable thermal contact.
- DateThermal Contact Conductance - introduced in 1.1: Thermal contact conductance [mW/(mm^2*K)] specified as a list in the following format (contact pressure and temperature dependency can be skipped and only one entry provided to define a constant gap conductance):
conductance_1, contact_pressure_1, temperature_1 ...
- DateSurface Behavior - introduced in 1.1: Contact behavior in the normal direction:
- Linear - default behavior with the specified stiffness
- Hard - hard contact (default constants calculated by the solver)
- Tied - tied (bonded) contact, requires non-zero friction
Notes
Tips for modeling
Note
CalculiX
CalculiX
- Rigiditatea contactului trebuie să fie de 10 ori mai moale (modulul Young) decât modulul de a avea un contact dur. Cu cât este mai mare valoarea rigidității de contact, cu atât este mai mare contactul dintre suprafețe.
- Fața slave este fața care intră în fața principală și, prin urmare, are mai multe deformări.
- Tabelul *CONTACT PAIR este utilizat pentru modelarea contactului în CalculiX. Constrângerea folosește contactul optimizat cu constrângeri față-în-față și formula de contact este explicată în detaliu aici la http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node112.html
- Overview for different contact types: https://forum.freecadweb.org/viewtopic.php?f=18&t=15699&start=90#p188736
- Further interesting informations:
- https://forum.freecadweb.org/viewtopic.php?f=18&t=23102#p180709 and following posts !!!
- https://forum.freecadweb.org/viewtopic.php?f=18&t=15699 (initial contact topic)
- A very detailed CalculiX contact example. (link)
- An interesting example found in the FreeCAD German subforum. (link)
FEM
- Materials: Solid, Fluid, Nonlinear mechanical, Reinforced (concrete); Material editor
- Element geometry: Beam (1D), Beam rotation (1D), Shell (2D), Fluid flow (1D)
Constraints
- Electromagnetic: Electrostatic potential, Current density, Magnetization
- Geometrical: Plane rotation, Section print, Transform
- Mechanical: Fixed, Displacement, Contact, Tie, Spring, Force, Pressure, Centrif, Self weight
- Thermal: Initial temperature, Heat flux, Temperature, Body heat source
- Overwrite Constants: Constant vacuum permittivity
- Solve: CalculiX Standard, Elmer, Mystran, Z88; Equations: Deformation, Elasticity, Electrostatic, Electricforce, Magnetodynamic, Magnetodynamic 2D, Flow, Flux, Heat; Solver: Solver control, Solver run
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- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
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