On 10/21/2016 04:01 PM, Hamed Babaei wrote:
Please look at the pdf file attached. Thanks
I'm not overly familiar with the nomenclature of large-displacement
elasticity. But the matrix you compute does at least not look *obviously*
symmetric to me.
If I see this right, you compute the integral
\int_K symm(grad phi_i * F_inv)
* Jc
* symm(grad phi_j * F_inv)
+ similar terms with tau
Here, Jc seems like a symmetric tensor. Are you sure it's positive definite?
For tau, is it symmetric? If tau is not symmetric, then your matrix is not
going to be symmetric.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
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