zenasniramdane | 23 Apr 19:34 2014
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delamination modelling

 

Hello, I am looking fo CAE  examples treating the delamination of composite materials with abaqus.

Thank you

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thu_ckx | 24 Apr 09:27 2014

Why the VVF of GTN model within Abaqus keeps 0

 

I calculated an example of unaxial tension using GTN model offered by Abaqus.
I followed all the instructions found in CAE User's and Analysis User's
manual in Abaqus documentation. No error or warning was issued but the
result seemed ridiculous, since VVF, VVFG and VVFN keeped 0 throughout the
process while equivalent plastic strain keeped increasing(which showed the
material had come into plastic deformation). I don't know what went wrong,
looking forward to you reply.


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ash.martina | 23 Apr 21:56 2014
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Take our user satisfaction survey and tell us what you think! Your opinion matters...

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Iftekher Rinku | 23 Apr 10:07 2014
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Impact Sumulation Help

 

Currently I’m doing numerical simulation of
axially loaded rectangular column under transverse impact loading. In my
simulation I’m facing a problem that with the increase of axial
preloading the impact force between impacting mass and steel column
is not decreasing much. Please find here my results for different
level of axial loading as attached file. With the increase of axial loading
the steel tube is deflecting more and failing at 60% preloading. However
initial pick impact forces are almost same. Could you please let me know any
reason why it’s happening by seeing my results. I’m struggling with axial
loading application for last couples of week.
I’m applying axial load in quasi-static manner followed by
ABAUQS/Explicit dynamic analysis.
 
I
really appreciate your kind advice and suggestion regarding this issue.

[Non-text portions of this message have been removed]

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sobieskipaul | 22 Apr 17:03 2014
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Stop an analysis during calculation

 

Hi everybody,

I wanted to know if someonehas an idea about how to stop a calculation job by verifying values each increment.
I know that in Abaqus Explicit we can use "Monitoring for extreme values of output variables" in the inp file but i'm using Abaqus Standard. Is there something like that too in Abaqus Standard ?

Thank you in advance.

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mechanand11 | 18 Apr 20:16 2014
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Orphan mesh

 

Hello all,


I have imported my meshed part in ABAQUS. The feature shows - "orphan mesh". 
This makes the instance dependent and I can't change it to independent.
I want to define my element type in mesh module. But since instance is dependent. it doesn't allow me to do it. 
I am doing SOILS modelling , so I need to define element type as pore elements.
I would appreciate your help to solve my problem. ( I think either I need to remove element type as orphan or is there any way to  change my element type) 

Thanks
Anand


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pumpkinwiz1 | 18 Apr 19:34 2014

Re: Where to find element set WarnElemDistorted.

 

Hey Debbie, welcome. When you are in the screen that displays all the jobs,
there should be a series of buttons on the right- such as monitor, delete,
etc. In there is a button called results. Click on the results. When you
open the results, there should be a list on the left. click on the "output
database", and identify your output database file generated (named as .odb).
Click on that. It will expand with a whole bunch of options. There should
be a tab called "element sets". click on that. In addition to the elements
you may have defined, it will include the WarnElemAspectRatio set. You can
right click on that and either set it so that that is the only part shown
(option "intersect") or everything without that ("remove").

I sorta just listed everything out from memory- let me know if you have
further questions. Good luck!


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Vahid Puwil | 17 Apr 21:45 2014
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Abaqus iteration

 

Dear all,

I have written a creep model in UMAT. The formulations are used for small displacements. I have implemented a NEWTON-RAPHSON (NR) method in UMAT to update the stress. Here are my questions:

- The problem is that for each increment a few iterations are done. However in each iteration, total strain increment, dstran, becomes larger and the same time increment, dtime, is passed on to UMAT, whereby the NR method does not converge. I think dstran and dtime should decrease. 

- Also the starting point for the iteration is the converged values of the last increment instead of last iteration which is different from what I have learned in my master studies.

- I am running the code with NLGEOM=OFF. I have not turned that on because my formulations are not for large displacements. What does switching NLGEOM on do? Could that be the cause of the previous problems?

- And the last question, could the tolerance for an iteration method be less than machine precision?!! I think the answer is no.

Thank you in advance for your time.
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Amr Mohamed | 21 Apr 20:47 2014
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first crack load

 

 How to define the first crack load of concrete when modelling it by concrete damage plasticity model ???

With My Best Regard and Thanks


Eng. Amr Mohamed
PhD Student, Cairo University, EGYPT. 
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narinder | 21 Apr 16:41 2014
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SORIENT output variable

 

Hello everyone,


To enable visualization of results in the laminate orientation, ABAQUS 6.13 has this feature of selecting layup-orientation  in the Results>Options>Transformations tab. But to use this feature, the documentation says one must have the SORIENT output variable in the field output.

But this output variable has been elusive to me. I can not find it either in the Field-Output-Requests tree, or in the documentation. Though documentation does keep on saying to use it, but doesn't tell where to find it.

I am using C3D8R elements for my model. Perhaps, this output isn't available for 3D elements, but then documentation must say something about.

If any of y ou guys have any idea about it, please let me know.

Thanks,
Narinder
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closed1368 | 17 Apr 10:27 2014
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How to simulate Absorbing Boundary Conditions for Seismic Analysis in ABAQUS?

 

Dear all
I want to simulate Absorbing Boundary Conditions for Seismic
Analysis in ABAQUS.
How should damping be assigned to the boundaries?
After that, should also be assigned them the support?
Which menu of software should be used?
Regards,

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Gmane