Visualizing Von Mises Stresses

Von Mises Stress images are used to visualize Von Mises Stress field patterns, which represent a scalar field quantity obtained from the volume distortion energy density and used to measure the state of stress.
Von Mises Stress Image objects belong to Static Case Solution objects sets.

The volume distortion energy density is often used in conjunction with the material yield stress value to check part structural integrity according to the Von Mises criterion. For a sound structural design, the maximum value of the Von Mises stress should be less than this yield value.

This task shows how to generate von Mises images on part geometries.

You can use the sample22.CATAnalysis document.

Before You Begin:

Go to View -> Render Style -> Customize View and make sure the Materials option is active in the Custom View Modes dialog box.

Compute the solution: for this, click the Compute icon .

1. Click the Stress von Mises icon

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The Von Mises Stress image is displayed, and a Von Mises Stress (nodal value) Image object appears in the specification tree under the active Static Case Solution objects set.

The Von Mises Stress distribution on the part is visualized in Iso-value mode, along with a color palette.

You can visualize the Von Mises Stress image in different ways by modifying the Custom view modes. To do this, you open the View menu and select Render Style -> Customize View option.

2. When the mouse cursor is passing over finite elements of the mesh, the values of the Von Mises Stress are visualized at each of their nodes.

3.Click on a finite element to obtain a steady display.

4. Double-click the Von Mises Stress Image object in the specification tree to edit the image.
The Image Edition dialog box is displayed.

Display on Deformed Mesh option

and the following tabs:

	`Visu` tab (how): provides a list with visu types (Average-Iso, Discontinuous-Iso, Text)
	`Criteria` tab (what mathematical object type): provides a list with criteria (`VON-MISES`)
	`Filters` tab (what): provides different filters. You can choose to generate images on nodes, elements, nodes of elements, center of elements or Gauss points of elements.
	`Selections` tab: either all or, in the case of CATProducts, pre-defined groups of elements belonging to given mesh parts can be multi-selected. In other words, given elements associated to a mesh part are automatically grouped and you can multi-select these groups (only available if you installed the ELFINI Structural Analysis product).

As you change the Visu option type, the name of the StressVonMises Image object in the specification tree is modified (the option type is appended to the name).

In addition, the following Edition switch button is available:

Iso Fringe: press this button to open the Image Iso Fringe Editor dialog box (only available if you installed the ELFINI Structural Analysis product)

The edition is not yet available. You are just provided information on the computation process used to create the image.

5. Click OK to quit the dialog box.
An image corresponding to your settings is visualized.

You can use the right mouse click (key 3) on a Von Mises Stress (nodal value) feature in the specification tree and select the option called Activate / Deactivate to turn the corresponding image on or off.

Products Available in Analysis Workbench

The ELFINI Structural Analysis product offers the following additional features with a right mouse click (key 3) on a StressVonMises feature in the specification tree:

Report: this icon generates a report in .html and .txt formats.