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I'm new with FEniCS and Python and I'm stuck with this issue: is there a way to write a 4th order tensor in an easy way to implement?

I have to compute the following stiffnes tensor:

$A_{ijkl}= \lambda \delta_{ij}\delta_{kl} + \mu (\delta_{ik}\delta_{jl} + \delta_{il}\delta_{jk})$

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  • $\begingroup$ You should really ask this over on the FEniCS forums. $\endgroup$ – Bill Barth Oct 31 '14 at 19:05

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