In ANSYS® Mechanical analyses, you can define the behavior of the parts whether they deform or not. This adjustment is called stiffness behavior, and it is very important like other settings for parts: thermal strain, non-linear effects… Here, we explain the stiffness behavior options in ANSYS® Mechanical below.
Stiffness behavior definition in ANSYS® Mechanical is a very simple process. As you see above, click on the required parts from the ‘Geometry’ tab in the outline tree as shown by the red arrow above, then select the required stiffness behavior from the drop-down list beneath the ‘Definition’ section as shown in the red box above.
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There are three options for stiffness behavior of parts; Flexible Bodies, Rigid Bodies, and Gasket Bodies. You need to select a proper one to save CPU and analysis times in ANSYS® Mechanical.
Flexible Option: Flexible option for parts in ANSYS® Mechanical is the default option for each part. If the flexible option is adjusted for parts, deformation results will be shown. The mesh structure is also created on these parts because CPU calculations for deformations are required.
Rigid Body Option: You can adjust your parts as rigid bodies in ANSYS® Mechanical. If you are not expecting deformations from your parts in analyses, you can set these bodies as rigid bodies.
Rigid bodies are considered as single bodies that have only inertia effects. Mass moment of inertia is considered for rigid parts, but deformational characteristics are not considered from the program. So, bodies that are selected as rigid in ANSYS® Mechanical, will not be meshed. So, CPU and solution times will be saved with the selection of rigid bodies properly.
Gasket Bodies: As you know that gaskets are used for transfer forces stresses between machinery components, and they are generally designed as thin parts. Most materials can be gaskets. And by selecting this, you can define the parts as gaskets in ANSYS® Mechanical analyses. The deformations and stresses through thicknesses of gaskets are considered from the program.
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NOTE: All the screenshots and images are used for educational and informative purposes. Images used courtesy of ANSYS, Inc.