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Static Analysis... part fail or give a insane deflection

Question asked by Kim Bruun on Mar 3, 2015
Latest reply on Mar 4, 2015 by Kim Bruun

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Hallo...

I will like to simulate this part with Static analysis

The part have and banana that start with a diameter on 5mm an go down to 0,75mm i diameter.

it form a half circle with radius 5mm

But when i do i just fail, even at 1N, i have tryed from 1N to 100N....

If i'm using "small displacement" i will get somthing like on picture 3

Picture 1 is the force with 20N and Fixed geometry

Picture 2 say that deformation is to big to be realistic, but i got the part i my hands, and it will take more than 20N to bend it 2mm (with large displacement)

Picture 3 will show up after the solver fails and i restart the samen simulation with the same config.

What i'm doing wrong ?

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Mike Pogue Mar 3, 2015 10:30 AM

Check the Young's modulus. You may be off by a factor of 10.

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Attilio Colangelo Mar 3, 2015 11:02 AM

I have had similar issues in the past which is generally a corrupt database. It's been a while since I've run into this but theses are some things that worked for me:

- Delete the node and element definition files manually. They will be in a <<partname-studyname>> folder. They have extensions like .ELF .GEN

- Make a copy of the part in a different (but local hard drive) directory and re-run the analysis

- Right click the study and check properties - > results folder and make sure there are no issues with the path (network drive or too long of a name)

what version are you using? Can you post the model?

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Jim Riddell Mar 3, 2015 3:19 PM

It would appear as if you only have the restraint (fixed) condition in one direction (perpendicular to the face). (However, that may just be due to an out of date SP - we had that graphics anomaly with an earlier SP in 2014.) If the model isn't well restrained then the solver will have large displacements as you seem to show. Try completely fixing the one side and re-run the analysis.

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Jared Conway Mar 3, 2015 9:01 PM

you are missing restraints

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Kim Bruun Mar 4, 2015 1:54 AM

I re-draw the part and loaded it with 150 N and Fixed geometry at the same place and now i works.... thx for your help

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5 Replies

Mike Pogue Mar 3, 2015 10:30 AM
Mark Correct
Correct Answer
Check the Young's modulus. You may be off by a factor of 10.
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Attilio Colangelo Mar 3, 2015 11:02 AM
Mark Correct
Correct Answer
I have had similar issues in the past which is generally a corrupt database. It's been a while since I've run into this but theses are some things that worked for me:
- Delete the node and element definition files manually. They will be in a <<partname-studyname>> folder. They have extensions like .ELF .GEN
- Make a copy of the part in a different (but local hard drive) directory and re-run the analysis
- Right click the study and check properties - > results folder and make sure there are no issues with the path (network drive or too long of a name)

what version are you using? Can you post the model?
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Jim Riddell Mar 3, 2015 3:19 PM
Mark Correct
Correct Answer
It would appear as if you only have the restraint (fixed) condition in one direction (perpendicular to the face). (However, that may just be due to an out of date SP - we had that graphics anomaly with an earlier SP in 2014.) If the model isn't well restrained then the solver will have large displacements as you seem to show. Try completely fixing the one side and re-run the analysis.
Like • Show 1 Like1
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Jared Conway Mar 3, 2015 9:01 PM
Mark Correct
Correct Answer
you are missing restraints
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Kim Bruun Mar 4, 2015 1:54 AM
Mark Correct
Correct Answer
I re-draw the part and loaded it with 150 N and Fixed geometry at the same place and now i works.... thx for your help
Like • Show 1 Like1
Actions

Static Analysis... part fail or give a insane deflection

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