Volumetric & surface integrals

disla

Hi,

¿Are volumetric/surface integrals computed over the original or over the deformed volume/surface?.

I’m planning to extract the strain energy on bodies that experience large deformations and I’m not sure about this point.

By other hand, what does this note on the manual means?

10.4 Mean and Volume Integral

“If the field value is defined by both element values and node averaged values, the element values are used for greater accuracy.”

Regards

Victor

They use the original element shapes.

The internal solver produces derived field variables (stress and strain, not displacement) as both node averaged and at element nodes, so the integral tools use the element node values in those cases. I'm not sure now if I can justify that accuracy is actually greater though. Perhaps it shouldn't say that. For some quantities, it's important, like values in element coordinates when the coordinates are different on adjacent elements.

disla

Thanks Victor,

"They use the original element shapes".

¿Could this be improved in some future or is it too expensive computationally?
I mean to compute in base of deformed shapes.

Thanks

Victor

I'll add that to my list.

disla

Thank you,

This could be noticeble in thermal analisys too, due to thermal dilation.