Static structural analysis for rotating wheel

Zach
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10 years 2 months ago #7971 by Zach

Replied by Zach on topic Re: Static structural analysis for rotating wheel

Hello,

thank you for reply,

yes, I`ve tried -45 deg. still the same error...

RichardS
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10 years 2 months ago #7972 by RichardS

Replied by RichardS on topic Re: Static structural analysis for rotating wheel

Then you should provide us with the files to reproduce the problem and find the error.

Best regards,
Richard

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Zach
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10 years 2 months ago #7973 by Zach

Replied by Zach on topic Re: Static structural analysis for rotating wheel

Ok,
here you are please:
www.dropbox.com/s/85au7r3ost9but9/rot1_sect.tar.gz?dl=0

RichardS
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10 years 2 months ago - 10 years 2 months ago #7974 by RichardS

Replied by RichardS on topic Re: Static structural analysis for rotating wheel

Hello,
so there were 2 errors:
- the axes of rotation you chose was not the z-axis (please have a look at §2.8.3 of www.code-aster.org/V2/doc/default/en/man_u/u4/u4.44.01.pdf )
- the master has to be a VOLUME

The correct BC should look like:

CYCL=AFFE_CHAR_MECA(MODELE=MODE,
                    LIAISON_MAIL=_F(GROUP_MA_MAIT='rot',
                                GROUP_MA_ESCL='SLAVE',
                                      ANGL_NAUT=(45.0,0.0,0.0,),
                                           CENTRE=(0.0,0.0,0.0,),),
                    );

Best regards,
Richard

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Last edit: 10 years 2 months ago by RichardS.

Zach
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10 years 1 month ago #7983 by Zach

Replied by Zach on topic Re: Static structural analysis for rotating wheel

Thank you,
it wrorks!
I`ve got ~ the same results for sector model as for full model.
However, when I tried a little bit complex wheel - I`ve got about 100 times higher results with cyclic sector comparing with full wheel:
www.dropbox.com/s/wwdp9jbl5ogvm7t/sect.png?dl=0
www.dropbox.com/s/15zkmw7rbd7q890/full.png?dl=0
I used identical input:
/home/zach/salome/appli_V7_4_0/130301_03_struct_withWelds2/Struct2.comm

Where from such (~100 times) could come from?

RichardS
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10 years 1 month ago #7984 by RichardS

Replied by RichardS on topic Re: Static structural analysis for rotating wheel

There could be a lot of reasons.

First, it looks like there is a stress concentration in your model which could be due to a geometric singularity (notch stress singularity).
If that's the case, the stresses in this area are totally random, and depend mostly on the mesh size.
Try to create a fillet an refine the mesh in this area, check if the results of each simulation are independant of the mesh.

...if there's still a problem, it would be nice if you could provide the complete files to reproduce the runs.

Best regards,
Richard

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