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I am trying to derive the Green Lagrange strain tensor and encountered the use of material displacement gradient where I need to define the tensor F as the difference of the material displacement gradient U and the identity tensor I.
What is static riks solver?? Please explain in details.. As I am a learner of abaqus I get problem understanding some things, like arc length, increment in static riks etc.. I find that it is very useful for simulating collaps behaiour.. I wish to do a thrust experiment regarding geological setup... Please help and guide me..
Thank you
Like we have the elastic strain energy density for small deformations defined as 0.5* σ :e .
Is the equation PK2:E valid for the total work energy density for elastoplastic regimes ? If not, what would be a valid equation for total energy density ?
How can we decompose total work density into elastic work and plastic work densities for a large deformation case.
Where,
PK2 is the second piola kirchoff stress tensor
E is the Green-Lagrange strain tensor
Thanks,
Prithivi
Hello,
I am trying to produce results for problems with analytical solution to validate my FE code. One of the problmes is the classical plate with a hole configuration with tractions applied at boundaries. However, presently, I can only impose BC in terms of nodal forces and displacements. Therefore I must transform the applied stress in statically equivalent nodal forces.
Hi everyone,
I am doing airplane impact problem. In my simulation, I need to have an airplane and a wall. The material of the wall is concrete. I utilized the LS-DYNA concrete damage
model (keyword *MAT_CONCRETE_DAMAGE) to describe the wall and also added *DEFINE_CURVE for tabulated strain/pressure data. I kept getting error messages:
*** Error 20450 (STR+450)
Material model 72 (CONCRETE_DAMAGE)
Only eos 8, eos 9 and eos 11 are valid
*** Error 20018 (STR+18)
input phase completed with 1 fatal errors
please check messag file
Hello at all,
I have some serious issues with some of my models in Abaqus 6.14. I need to simulate shear failure to investigate the influence of concrete strength and fracture energy on the size effect. So far, everything went good. I calculated almost 100 models without any problem with exactly the same model (only materials changed). But: For the combination of concrete strength fck=50MPa and a fracture energy of Gf=60N/m or Gf=80N/m, the calculations will stop after a short time although the .odb file shows only some minor bending cracks in the beam
Dear all,
Currently I am engaged in solving a geological problem. So we have some soil model in the form of disk, there is a circular hole in the center, which has the initial pressure at the reference time (a modelling of the soil injection with the polymer compound)
How can I recalculate the normal pressure inside the circular hole of the soil model using the DLOAD subroutine if the neighbouring FEs were failed.
Hello,
While showing results under Visualization in abaqus, I can generate contours of U1,U2 as displacements. How can I plot contours of Ux and Uy? Similarly, How can I plot contours of Sigma_x, Sigma_y and Sigma_xy?
Thanks a lot in advance!
Hello, everybody. I am relatively new to ABAQUS so i need help from the ones who know a lot more than me. I did a lateral torsional buckling analysis of a beam made of shell elements and i have introduced the first buckling mode as an initial imperfection for my next step where i need to obtain the ultimate bending moment, which has to be lower than the critical moment, due to imperfections. My questions are:
1) Do i conduct static general or static Riks analysis?
2) Do i use the critical load to obtain the ultimate bending moment?
