Structural Mechanics Module Updates For users of the Structural Mechanics Module, COMSOL Multiphysics ® version 5.3a brings bolt thread contact modeling, a more general fluid-structure interaction multiphysics coupling, and improved default plots for better visualizations. Learn about these structural mechanics features and more below Bolt Thread Contact Modeling When modeling bolted connections, the stress state in the vicinity of the bolt hole can be significantly influenced by the wedging effect caused by the contact pressure between the internal and external thread. However, it is seldom possible to include the actual geometry of the threads due to model size and meshing considerations. The new Bolt Thread Contact feature in the Solid Mechanics interface makes it possible to model the two threaded parts while using only cylindrical surfaces in the geometry.
With this feature, you are able to incorporate the salient effects of the threaded connection. Comparison of stress normal to a cut plane through the bolts. The bolt to the right is modeled using the new bolt thread contact condition, whereas the bolt to the left is joined to the bolt hole using a continuity condition. Note the example of the settings in the Bolt Thread Contact node.
Comparison of stress normal to a cut plane through the bolts. The bolt to the right is modeled using the new bolt thread contact condition, whereas the bolt to the left is joined to the bolt hole using a continuity condition. Note the example of the settings in the Bolt Thread Contact node. Improvements for Bolt Pre-Tension The Bolt Pre-Tension feature can now be added in 2D axisymmetric components for the Solid Mechanics interface. By necessity, the bolt is located at the axis of revolution for 2D axisymmetric cases. Additionally, in the Bolt Selection subnode, in both 3D and 2D axisymmetry, you can now specify a relaxation of the bolt predeformation, which can be a function of time and loading history, for example. New Fluid-Structure Interaction Interface A new Fluid-Structure Interaction multiphysics coupling has replaced the interface used in previous versions of the COMSOL ® software.
The new coupling matches the modern style, with a number of single-physics interfaces and multiphysics nodes to couple them together. With this approach, all functionality in the constituent physics interfaces is available for fluid-structure interaction (FSI) modeling. On the structural side, many additional boundary conditions and material models are now available for FSI analysis; for example, rigid domain, piezoelectric, and nonlinear elastic material models. Blue Carpet Treatment Megaupload Movies on this page. On the fluid side, all turbulence models are now available as well as a number of new boundary conditions. Additionally, you have more flexibility when building and solving a model.
For more information about PMLs, see the COMSOL Multiphysics Reference Manual. Figure 2: Overview of the model geometry with the structures in pink. The Material Library contains 2,500 materials. Augment your multiphysics simulations utilizing temperature-dependent properties of many common materials. Ms Office 2011 Mac Keygen Download.
You can start with a single-physics model, either structural mechanics or fluid flow, before adding the fluid-structure interaction, and you can disable a physics interface in an already coupled model to solve for only one physics. The new functionality facilitates adding a third physics, such as heat transfer, and even additional physics beyond that. Finally, the moving mesh, now its own node under Definitions, can be disabled and enabled as needed. After adding a Fluid-Structure Interaction interface from the Model Wizard, you will get a Solid Mechanics interface, a Laminar Flow interface, a Fluid-Structure Interaction multiphysics coupling node, and a Moving Mesh node in the Definitions section. All fluid-structure interaction models in the Application Libraries have been updated to include this new coupling functionality. The peristaltic pump model has been updated to include the new Fluid-Structure Interaction interface coupling. The peristaltic pump model has been updated to include the new Fluid-Structure Interaction interface coupling.
Generalized Plane Strain For 2D solid mechanics, a generalized plane strain formulation has been developed as a third option to the plane strain and plane stress approximations. The generalized plane strain approximation is intended for modeling the central part of structures that are long and have a constant cross section. For these cases, as opposed to a standard plane strain formulation, nonzero out-of-plane strains are present. When selecting the type of 2D approximation, you can choose the Generalized plane strain formulation.