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Presentation of results - Inspire / Hyperview

Hello,

I have a question regarding the presentation of results.

Find attached two pictures of the same result presented in Inspire and Hyperview (from scratch directory. fem & h3d).

You can see the result of a screw pretension. The stress distribution look extremely different and i'm a little bit surprising.

Is there any reason for that?

Best Regards,

Mario

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Altair Forum User

Hi Mario,

please share your element size and type (first or second order), so I can try to reproduce your issue.

Thanks!

Felix

Mario_21478

Hi,

The file is already attached in the post. ()

Best Regards,

Mario

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Altair Forum User

Hi Mario,

The file doesn't contain results or the information what element/size were used.

Felix

Mario_21478

Hi again,

The 'Autocalculate Meshsize' of both parts is switched off and min. is 1mm, max is 5mm.

There is nothing more to do, only run a calculation. If it is not comprehensibly, then i can send also results (but the file is much bigger, since you need also the h3d for Hyperview).

Version i'm using is Inspire 2017.3.1 build 8625.

Best Regards,

Mario

Altair Forum User

Hi Mario,

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By default, Inspire is using Grid Point Stresses, so we have to choose them in HV to compare. I also slightly adjusted the min/max in the Inspire legend.

Hope this helps!

Best Regards,

Felix

Mario_21478

Hi Felix,

Thank you for the explanation, now I can understand it.

Unfortunately, this does not improve the plausibility of the result.

Best Regards,

Mario

Altair Forum User

Hi Mario,

You have supported the lower plate. So the stress results of pretension must be asymetric.

Or do you see something else?

Felix

Mario_21478

Hi Felix,

The asymmetry is not the problem, but the stress distribution does not look plausible.

Corresponding to the pressure cone (area) of a screw connection, the highest load should occur at the top.

Best Regards,

Mario

Altair Forum User

Mario,

You might would like to decrease element size to get a more detailed look at the stress distribution. For my point of view, there is all right.

We can clearly see the maximum peak of sheer stresses below the surface - so the van mises stresses.

This effect is discribed in the Hertzian compression theory, which can also explain defects like pitting.

Felix