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FEM: 2nd principal stress

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Message 1 of 5
vosssoeren
958 Views, 4 Replies

FEM: 2nd principal stress

Hi,

I want to do a simple FEM simulation according to the German FKM guidelines. For that, I need (additional to the 1. and 3. principal stress) the second principal stress to calculate the hydrostatic stress. I can get the 2nd stress by creating the stress tensor for my critical point and calculate the eigenvalues. However, that is a little bit annoying if I have to do this very often. Is there a workaround to get also the 2nd principal stress directly from inventor or the hydrostatic stress?

Can I get the value my a macro?

4 REPLIES 4
Message 2 of 5
JDMather
in reply to: vosssoeren


@vosssoeren wrote:

Is there a workaround to get also the 2nd principal stress directly from inventor or the hydrostatic stress?


There is now way to directly run a hydrostatic test in Inventor (without Nastran), but you can use this workaround.

https://youtu.be/FH7Esv8cI94

 


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Message 3 of 5
vosssoeren
in reply to: vosssoeren

Thank you for your answer and for this interesting video but my question is different.

The hydrostatic stress I am looking for is the average overall three principal stress in the material.

(sigma1 + sigma2 + sigma3) / 3

Inventor can show me sigma1 and sigma3 but I'm missing sigma2.

 

Message 4 of 5
swalton
in reply to: vosssoeren

@vosssoeren I think @JDMather 's reply was to remind everyone that Inventor FEA does not have a true Hydrostatic load.  

 

I've taken a brief look at one of my models.  I don't see a way to have Inventor FEA calculate the 2nd principle stress.

 

Inventor FEA is a very limited package.  If you need different constraints, loads, meshes, or results use Inventor Nastran.  Fusion360 might have some options too.

 

Steve Walton
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Message 5 of 5
JDMather
in reply to: JDMather


@JDMather wrote:


There is now way to...


I meant to write, "There is no way to..."


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Autodesk Inventor 2019 Certified Professional
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Certified SolidWorks Professional


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