Physics Interfaces for Modeling Structures
In Part 2 of this course on structural mechanics modeling using COMSOL Multiphysics®, we discuss the physics interfaces available with the add-on Structural Mechanics Module. We then follow this with a step-by-step modeling demonstration in which we build a model of a structure using both solid and shell elements.
Discussion: The Structural Mechanics Module Interfaces
In COMSOL Multiphysics®, we call a set of differential equations as well as their associated boundary conditions, meshes and solver settings, a physics interface. In the software, the structural mechanics interfaces can be used to model different types of structures using solid, shell, and edge elements. Here, we provide a general overview of the physics interfaces available and discuss how and when to use each type available. We also discuss how to approach using a combination of these interfaces to model a structure and the logic behind doing so. When coupling structural mechanics interfaces, a critical assumption is to assume displacement continuity across the boundary of the two components.
Demo: Modeling a Structure Using Solids and Shells
Follow along in the software as we use both solid and shell elements to conduct a linear static analysis of a bracket. The Solid interface highlights the importance of 3D effects, while the Shell interface is needed for modeling the thinner regions. Open the bracket_basic model file, which is available in the Application Libraries under Structural Mechanics Module > Tutorials to get started with building the model. An overview of the model is provided in which we see how the geometry was prepared in order to model the bracket using solids and shells. Likewise we cover how the meshing is handled differently for these regions.
Further Learning
In the Application Libraries in COMSOL Multiphysics, there are multiple tutorial models available with which you can gain experience in using multiple structural mechanics interfaces to efficiently simulate a structure. These can be found under the Structural Mechanics Module branch in the Beams and Shells section. Additionally, see the blog post on "Coupling Structural Mechanics Interfaces", which discusses these modeling implementations in more detail.
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