1. I have created the following geometry using CellData class. Now I wanted to
calculate stresses and strains under dirichlet and Neumann boundary conditions
for the attached triangulation.
For strain calculations I have used the DataPostprocedure tensor class, but my
problem is how to calculate stress while there are two materials in the same
domain?
I see from your picture that you have already used the material_id to mark
which cells are which. You can access the material_id of the cell you are
currently working on from the DataPostprocessor object: The
DataPostprocessorInputs object you are handed in the evaluate() function gives
an example of how to do that:
https://dealii.org/developer/doxygen/deal.II/structDataPostprocessorInputs_1_1CommonInputs.html
2. I am also facing difficulty calculating single material, I tried the
procedure which is mention in documentation that multiply strain with
stress-strain tensor (considering lambda=1, mu =1), see below
image.png
but I am getting the following error:
error: invalid operands of types ‘dealii::Tensor<1, 2>::value_type’ {aka
‘double’} and ‘int [3][3]’ to binary ‘operator*’
68 | = ((input_data.solution_gradients[p][d][e]
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
69 | +
| ~
70 | input_data.solution_gradients[p][e][d]) / 2)*C;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
Well, what data type do you use for 'C'? The error message says something
about int[3][3], but it's not clear to me what that is. Can you show the code
you use?
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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