Hi
On Thursday, December 22, 2016 at 5:47:24 AM UTC+1, cmha...@gmail.com wrote:
>
> I have gone through some of the tutorials previously and thought it was
> about time I actually tried to implement something on my own in the
> library.
>
> I am attempting to implement a finite strain code using the F-Bar method.
> Essentially this is a single field formulation which requires the
> calculation the of the deformation gradient at the element center. The
> trick here is though that the element centroid isn't a vertex.
>
> My question is, is there a way to "interpolate" the displacement gradient
> at the element center without explicitly making it a quadrature point or
> will I have to implement my own quadrature formula for this method?
>
Yes, employ a custom quadrature formula with a single point with
coordinates {0.5, 0.5, 0.5} to feed it to FEValues.
There is no reason to figure out how to interpolate things, just use
Quadrautre<dim> and FEValues<dim> together to evaluate your solution at
quadrature point(s).
Regards,
Denis.
>
> Thank you for any assistance that can be provided.
>
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