ADINA TMC
ADINA TMC wird vorzugsweise für die Lösung von gekoppelten thermomechanischen Problemen verwendet. Das Programm ermöglicht voll gekoppelte Betrachtungen, d.h. die thermische Lösung beeinflußt die Strukturlösung und die Strukturlösung wiederum beeinflußt die thermische Lösung. Natürlich können in ADINA TMC auch einseitig gekoppelte Probleme untersucht werden, bei denen jeweils nur einer der beiden physikalischen Bereiche den Anderen beeinflußt.
ADINA TMC wird auch für gekoppelte Probleme verwendet, die in ihren physikalischen Gleichungen der Wärmeübertragung ähnlich sind. Dies betrifft die Analyse elektrischer Felder und die Berechnung von Strömungen durch poröse Materialien.
Somit sind piezoelektrische Betrachtungen ebenso wie die Berechnung von Versickerungen im Erdreich möglich.
Es können die folgenden mechanischen Einflüsse auf das thermische Verhalten berücksichtigt werden:
- Innere Wärmeentwicklung aufgrund von plastischen Verformungen oder viskosen Effekten (Reibung in zähflüssigen Medien)
- Wärmeübergang zwischen sich berührenden Körpern
- Wärmeentwicklung durch Reibung
Es können die folgenden thermischen Einflüsse auf das mechanische Verhalten berücksichtigt werden:
- Wärmeausdehnung
- Temperaturabhängige mechanische Eigenschaften
- Temperaturgradienten in Volumen und Schalen
Thermo-Mechanical Coupled Analysis of an Automotive Disk Brake
In this example, we present a 3D transient dynamic analysis of an automotive disk brake. The model has frictional contact, large displacements and strong thermo-mechanical coupling. The sources of thermo-mechanical coupling are the conductive heat transfer between the rotor and pads which only occurs when there is contact, the heat generation due to friction, and the stresses caused by the non-uniform thermal expansion ....
3D Simulation of a Full-Contact Disc Brake System
This example involves a Thermo-Mechanical Coupling (TMC) simulation of a full-contact disc brake system for heavy-duty trucks. A simpler axisymmetric analysis of a disc brake system was shown in a previous News. The figure below shows the mesh used for both solid and thermal analyses. Friction between the disc and the stati ....
Analysis of an Engine Exhaust Manifold Using the Shear Stress Transport Model
The animation above shows a particle trace in the exhaust manifold of a Volvo Penta 6-cylinder D6 diesel engine. The results were obtained using the Shear Stress Transport (SST) turbulence model, which is available in ADINA 8.3. A detail of the manifold with pressure contours is shown below. The Reynolds number at the inlets of the manifold is approximately 13,000. The walls are all modeled as no-slip. All the inlets have the same prescribed velocity and prescribed turbulence quantities, k and ?. There are 586,120 FCBI-C elements (~3.5 million equations ....
Automotive Gasket Simulation
In the automotive industry, gaskets are used to make the seals at various joints fluid-tight. In the example shown above, a typical gasket seals the joint between the cover and the base. The entire assembly is held together by two bolts. In ADINA, the action of gaskets is simulated by material models. Here, we use the general gasket material model in a typical load cycle experienced by an automotive gasket. The gasket that we are modeling has a flat ....
Mesh Glueing in Thermo-Mechanical Solutions
In many practical applications it is desirable to use the same finite element model for mechanical and thermal or thermo-mechanical-coupled solutions. The model might have in different regions fine meshes and coarse meshes of totally different element types connected to each other, e.g., 10-node tets to 27-node bricks. Therefore, we have extended the mesh glueing capability to include temperature degrees of freedom. This option, available in ADINA ....
Thermo-Mechanical Coupling Analysis of a Rubber Pad
In the structural model, the pad is modeled using the Ogden material model with additional viscoelastic effects. In the thermal model, the pad is modeled with a constant thermal conductivity and specific heat, with convection on the free edges of the pad. Initially the pad is at 25 degrees ....