Shell Element Stess Results: Conflicting results displayed

[RoSChneider]

Guys,

Please have a look at the following screenshot:

X-Normalspannun o_u.jpg

The colours show a region of compressive stress in the region of the applied force and a corresponding region of tensile stress on the reverse side of the surface. That is correct. Assuming that "top" is the surface facing the model origin, the values given in the probe are consistent with the colours.

The "Max" and "Min" values are however of the opposite sign and not consistent with the colours.

How is "top" and "bottom" defined in Nastran InCAD?

Is there a bug here?

Ron

[John_Holtz · Accepted solution]

Hi Ron,

Yes, it appears that the max and min flags are shown at the wrong locations. I will pass this on to the developers.

The default for top and bottom are determined from the Inventor model, but you can view and/or reverse the direction.

• To show the orientation, right-click on "Elements" in the model tree and choose "Normal Display > Vector". This adds an arrow to each element. The "top" side is in the direction of the arrow. Or, choose "Elements > Normal Display > Color". Yellow is the top, and blue is the bottom.
• To change the orientation, right-click on "Elements" and choose "Reverse Normals". Select the faces to change and click OK.

Since you are viewing the X-Normal (and presumably the Y-Normal), the orientation of the elements is important. This is done by defining a material orientation. Right-click on the analysis and choose "New > Material Orientation".