Answering my own question...
In a non linear analyses in Abaqus, the Newton solver used updates the reference configuration at every iteration.
The equation that is solved is no longer K*U-F
but K*U - F = Ktan*(deltaU)
with Ktan the tangent stiffness matrix and deltaU the last variation on the...
The difference in CPU time could also come from the contact formulation that is used...
Abaqus/Standard uses a lagrangian multiplier formulation by default which doubles the amount of unknowns in the problem.
You can try with an Augmented Langragian formulation (all versions), or a penalty...
Hello,
After doing an elastic, static NLGEOM analysis on my model, I recuperate the elementary matrices, nodal displacements and efforts.
After assembling the elements, and doing K*U - F I don't get zero. Whereas if the analysis is linear the sum is equal to zero.
I have a feeling it's...
Hi there,
I'm beginning with C++ and looking for matrix class templates. I'll probably have to handle large matrix (1000*1000), and there are quite a few different templates that are free.
Which one is the easiest and most efficient for handling large systems (dynamic memory allocation)? What...