4th Rank Tensor & Kronecker delta representation
Dear "oh dear"
How can I define a 4th rank tensor in OF?
I need to write the incremental stress-strain relationship for, say, an elastic material as (tensorial notation):
Sigma = E: Epsilon
; E(ijkl) = (B-2G/3) dij dkl + G (dik djl + dil djk)
E --- isotropic elastic coefficient 4th rank tensor
B,G ---- scalars
d ----- Kronecker delta(s) ??????? (how to implement them dij/dkl/etc.)
Lastly, how to write this equation???
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