ABAQUS

Hi all,

In Abaqus Theory Manual 4.6.1, there is a concept called "effective deviatoric elasticity". I think that term is actually DDSDDE, i.e. the consistent linearized tangent moduli. 

But why is it called "effective  DEVIATORIC elasticity"? It sounds like we missed the volumetric part (but only considering the isochoric part).

I would really appreciate it if someone could help me with this. Thanks!

-Shawn 

Hi all,

I have been writing a UMAT function with modified hyper-visco-elastic model. My question is: after I got the Cauchy stress at the end of step, how do I get the SSE （elastic strain energy density)?

If it is only hyper-elastic I would have known (since the strain energy function itself is given). However, if it is viscoelastic, how should I calculate?

PS: I would also appreciate it if anyone could shed some light in getting SPD, SCD as well. Thanks a lot!

-Shawn

Hi friends,

im working on an abaqus model which should be meshed by AC3D4 acoustic tetrahedral elements.

 i attached the picture of main meshed model and my model .

but there is a difference between them. ( i pointed them by white areas)

how can i mesh o control mesh to create that kind of meshing

 top model is mine and bottom is original model.

tnx

Hello

Problem description: There is a simply supported(roller supports) shell element I-beam. There are lateral bracings too. All of this boundary conditions belongs to the Riks step(always last step in analysis).

Question: I have implemented triangular residual stresses by SIGINI subroutine, but I'm not sure what boundary conditions set up in preliminary equlibrium step. Should I include all of the lateral bracings in this step or maybe only roller support? 

Thank You