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 ...
- DateHard Contact - introduced in 1.1: Enable hard contact (default constants calculated by the solver).
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
- Results: Purge, Show; Postprocessing: Apply changes, Pipeline from result, Warp filter, Scalar clip filter, Function cut filter, Region clip filter, Contours filter, Line clip filter, Stress linearization plot, Data at point clip filter, Filter function plane, Filter function sphere, Filter function cylinder, Filter function box
- Additional: Preferences; FEM Install, FEM Mesh, FEM Solver, FEM CalculiX, FEM Concrete; FEM Element Types
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