FEM: Constrângere la Contact
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Descriere
Creează o constrângere MEF pentru contactul între două suprafețe.
The FEM contact task panel
Cum se folosește
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.freecad.org/viewtopic.php?f=18&t=15699&start=90#p188736
- Further interesting informations:
- https://forum.freecad.org/viewtopic.php?f=18&t=23102#p180709 and following posts !!!
- https://forum.freecad.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)
- Materials: Solid Material, Fluid Material, Non-Linear Mechanical Material, Reinforced Material (Concrete); Material Editor
- Element Geometry: Beam Cross Section, Beam Rotation, Shell Plate Thickness, Fluid Section for 1D Flow
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- Geometrical Analysis Features: Plane Multi-Point Constraint, Section Print Feature, Local Coordinate System
- Mechanical Boundary Conditions and Loads: Fixed Boundary Condition, Rigid Body Constraint, Displacement Boundary Condition, Contact Constraint, Tie Constraint, Spring Boundary Condition, Force Load, Pressure Load, Centrifugal Load, Gravity Load
- Thermal Boundary Conditions and Loads: Initial Temperature, Heat Flux Load, Temperature Boundary Condition, Body Heat Source
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