On 11/18/22 05:42, Raúl Aparicio Yuste wrote:
Thank you for your answer. As you mention, one can compute the principal
stress components in different ways, for example, by computing the eigen
stress values or by using the Mohr’s circle. I thought that maybe someone had
already faced that problem before with Dealii, or that Dealii itself could
give you that variable as an output. That would be great.
deal.II doesn't already have this built in, but it would certainly be very
nice if you contributed whatever you come up with for inclusion!
(I will caution that one of the reasons deal.II doesn't have this is because
the stress depends on what formulation of elasticity you use. It is relatively
straightforward if you have linear isotropic elasticity because then you can
compute it from the strain and just the two Lame parameters. But if you have
some more complex, possibly nonlinear material, then the computation of the
stress tensor can be substantially more complicated -- and that makes it less
appealing to include in a generic library. But it would make for a nice
example in the documentation of DataPostprocessorVector, for example, in the
same way as the computation of the stress tensor is currently in the
documentation of DataPostprocessTensor.)
Best
W.
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Wolfgang Bangerth email: [email protected]
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