I think that the statement of that question in poor, however, I think
that I know his desire; the "double-dot product" (: operator commonly
used in continuum mechanics) of two tensor fields.
In elasticity problems, elasticity coefficient-field, E, is 4th order
tensor field, displacement field u is 1th order tensor field and the
elastic stored energy is computed by the following formulae:
0.5 \int \nabla u : E : \nabla u
I think that it's pretty easy to implement using the classical utilities
available in deal ii, however, if it has some special abstraction in
this regard, it may be answer to that question.
We've solved the problem offline in the meantime. It wasn't in the
function that assembles this term but rather a misunderstanding in
generating graphical output.
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.tamu.edu/~bangerth/
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