[CIG-LONG] [Gale] Displacement vectors and Finite strain ellipsoid?

[Walter Landry]

<Guillaume.Duclaux at csiro.au> wrote:
> G'day all, g'day Walter,
> 
> I'd like to represent displacement vectors and finite strain
> ellipsoids (Eigen vectors of the finite strain tensor).
> 
> Did some of you ever tried to deal with that?
> 
> I think that it would be great to have such outputs in the VTK
> Fields files. I've been playing with instantaneous stress tensors in
> order to visualise change of stress direction within a model. I'd
> love to be able to visualise the instantaneous and finite strain
> tensors for these models!

You can get the instantaneous strain by multiplying the strain rate
tensor by the timestep.  Finite strain is a bit more complicated.
Finite strain under yield is already available.  However, it is only a
scalar.  Recording everything is not fundamentally difficult, but it
would require some fiddling to get it to work.

Cheers,
Walter Landry
walter at geodynamics.org