Structural FEA Intern
Mar 05, 2009
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ABAQUS
Computer Assignment #2
Computer assignment #2 : natural frequency problem
due on Monday (Nov. 17, 2008)
Assignment #1
Abaqus Tutorial
1 Schedule & Proceedings
2 Reading-about ABAQUS
3 Learning ABAQUS
4 CAE example
Model Overconstraints
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Hello all,
I have created a 3-d dynamic model in ABAQUS using shell elements. When I run the analysis I get several warning messages indicating that I have zero pivot nodes. When I locate where these nodes are, I find that they are in the middle of my beam (modeled with shell elements) away from any boundary conditions. Does anyone know why ABAQUS is indicating these inconsistent overconstraints in the middle of my model??? The analysis fails to converge when NLGEOM=yes but has no problems converging when NLGEOM is removed.
Thanks in advance
ABAQUS damaged plasticity model
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I am trying, quite unsuccessfully, to model a composite steel frame under dynamic loads. The problem is nonconvergence brought upon by the concrete tensile strains (i think). Apparently ABAQUS kills the analysis once cracks form in the concrete. Has anyone had any success using the "Concrete damaged plasticity model" under cyclic loads and large strains. I have found that researchers use many different concrete properties to get convergence, but I am more interested in a better concrete representation.
Any help on this would be greatly appreciated.
Applying Non-Uniform Distributed Forces/Pressures in Abaqus
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I am working on a problem involving wind-tunnel testing of a component. Basically, the component has numerous pressure tappings on its surface to measure the pressure in the wind tunnel. I am required to apply these pressure measurements into the Abaqus model. I am looking for some suggestions as to how best to accomplish this. Basically, the output from the pressure tappings looks like this (I moitted some details...):
Rotating disk -- Spin Softening -- Ansys/Abaqus
I have been told about "Spin Softening" option for rotating cylinders in Ansys but did not really understand how/what/why. I have gone thru Ansys documentation and it appears that the centrifugal loads are applied to the deformed configuration if the Spin Softening option is selected. Does Abaqus have a similar option ?
Now what the "Spin Softening" is meant to do is apply a centrifugal force:
F(r) = density*(r+u)*speed^2
Illegal floating point operation
Can anyone shed some light on this particular error?
ABAQUS Error: The executable /app2/6.6-1/exec/standard.exe
aborted with system error "Illegal floating point operation" (signal 8).
Is there a possible reason for this error as I have gone through my code many times and dont find any suspicious statements that could lead to this error.
This occured when I was running my analysis with a USDFLD and MPC subroutine
Abaqus cylindrical
I am currently simulation arc welding process. i have performed plate butt welding using abaqus software. Dflux subroutine was used and the heat source model i used is goldak double ellipsoidal model.
Now i want to apply this technique to the welding of pipes, but currently i am having difficulty with the nodal coordinates. I have defined my glodal CS to cylindrical coordinate system in part and assembly defintion. But after generating the mesh the input file contain nodal coordinates in cartesian coordinates.