Using energy results

[yaston4]

Hi all,

In you stress, strain and contact analysis simultations, I am trying to learn more about how the experts use energy results to confirm the validity of the results.

Thanks

 

[IceBreakerSours]

Strain energy density of the model should stabilize as the mesh density increases.

http://www.eng-tips.com/faqs.cfm?fid=376

http://www.eng-tips.com/faqs.cfm?fid=1083

 

[Drej]

Implicit or Explicit?


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See faq569-1083 for details on how to make best use of Eng-Tips.com

 

[yaston4]

Implicit or Explicit?

Both, I would really like to learn more about this. Thanks.

 

[burningDiesel]

Energy output is particularly important in checking the accuracy of the solution in an explicit dynamic analysis. In general, the total energy (ETOTAL) should be a constant or close to a constant; the “artificial” energies, such as the artificial strain energy (ALLAE), the damping dissipation (ALLVD), and the mass scaling work (ALLMW) should be negligible compared to “real” energies such as the strain energy (ALLSE) and the kinetic energy (ALLKE).

In a quasi-static analysis the value of the kinetic energy (ALLKE) should not exceed a small fraction of the value of the strain energy (ALLIE).

It is a good practice to output the constraint penalty work (ALLCW) and the contact penalty work (ALLPW) in analyses involving constraints (such as ties and fasteners) and contact. The value of these energies should be close to zero.

(manual)