ipc Connection Error

Arun asks..

hi pls help me..am doing 3d modelling and analysis...am started a case 4 days before...now it shows job s running...but i cant monitor that...if i give the monitor,abaqus ifself automatically closing..y i did nt know... GUI detected for error while waiting for the ipc connection to close....abaqus error:abaqus\CAE kernal excited with an error...


Answer :
I have a feeling that this has nothing to do with the solver itself. I guess there would not be any error messages in the .sta file. But if you find error messages there, please let me know.

Did you change any of your system configuration recently. Anything to do with the graphic card? If so probably it has something to do with Hardware Accleration

Try setting
abaqus_no_hardware_acceleration=ON
in your abaqus_v6.env file and rerun the simulation.

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Vijay Kumar said..
Thank you very much for adding RSS feed.I have seen in another blog there "sign up for site updates" facility is available.There I have given my email id.When new article was posted in that blog I will get the information about that.Like that can you add that facility to this blog also.That is very useful for the most........

Response :

The "Sign Up for Site Updates" Feature is now available in this blog. Thanks Vijay again for the sugestion.

Using subroutines without fortran compiler

Abhijit aks..
I am doing a heat transfer analysis using ABAQUS. I am using a subroutine FILM but my computer does not have a FORTRAN compiler. So, I think I can not run this job on my computer.
Can you give me some suggestion: how get away with FORTRAN compiler and still use the subroutine. Otherwise is there any other way where I can get it for free.

Answer :
There are several options that you can try..

1. You can download the Intel Visual Fortran Compiler for trial and run for 30 days. Make the object file using abaqus make. Use the object file in future. Also note that before that you need to have Microsoft Visual Studio pre installed. You can also download a free trial version of it.
Intel Visual Fortran Trial Version Download Page

2. Try installing the free fortran compilers like GNU
GNU Fortran Homepage
I dont know for sure if it would work seamlessly, because it is not supported by Abaqus. But it is worth a try.

3. Compile the Fortran Program in an another abaqus machine with fortran, using abaqus make. And try to use that with your simulation.

Good luck!!

Tie Constraint over many surfaces

Bharath asks...
Im doing a quater model aluminium specimen which has counter sunk hole . SO
i basically divided it into 4 parts like 1 with counter sunk and den the st
shank and 2 more additional peices attached to it. what i hve done is used
tie constraint for all to make node equivalnce ..but der is problem with tie
constraint it gves me warning says nodes on the lave surface have more than
one tie constraint so it is automatically removing one tie constraint ...

is der any other way for me to do this node equivalnce with using tie
constraint or and i cannot use partition because of geometry too ...
and lastly im not getting the mpc constraint in abaqus 6.7.3 which i used
to get in the 6.6.3.


Answer :
Try modelling such that there is one master surface which ties to several other slave surfaces. Or if a slave surface of constraint-1 comes into constraint-2 with another surface, then define the slave surface from constraint-1 as master surface in constraint-2. Basically avoid modelling a slave surface being driven by more than one Master Surface.

MPCs can be accesed in 6.7-3 using the keyword *MPC. This is not supported in CAE.

Choosing Elements

Jason asks..
Would you please instruct us how to choose the type of solid elements in large deformation analysis? For example,linear or quadratic, reduced integration or not ?

Answer :
The choice of the elements, depend on the type of problem and the material. I will try to give brief guidelines.

1. In General, the Quadratic meshes give more accurate results than the Linear meshes. But the quadratic elements should NOT be used for the faces coming in contact. This will produce unrealistic jump in Contact Pressure values. In that case, better to refine the mesh and use linear elements

2. Many non-linear problems use nearly incompressible materials. Usage of Fully Integrated Elements in this case will lead to volumetric locking and therefore excessive stiffness. Usage of Reduced Integration elements ( e.g. C3D8R) will relax it and provide more realistic results. But, one should be careful with the effect of Hour glassing when using Linear Reduced Integration Elements

3. Hour glassing is the phenomena of elements distorting in such a way that there is no change in Strain Energy. It behaves like a rigid body mode. One should be concerned with hour glassing effect only in Linear Reduced Integration elements. In Quadratic Reduced Integration Elements, Hour glassing doesn't propagate and therefore has no big effect. Most of the times, hour glassing can be controlled by using enhanced hour glass stiffness option. When using hour glass stiffness one must keep an eye on the artificial energy created in the system and make sure it is low.