bothioan@yahoo.com [Abaqus] | 26 Aug 19:14 2014
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Thermal analysis of slab

 

Dear All,

I am trying to model a fiber reinforced concrete slab on steel beams. I have applied the load in the first step and applied thermal conditions (convection and radiation) in the second step. The analysis reached 400seconds (tops) ( I was expecting 7000s). I have modeled the structure with solids. Slab tied to the beam.
the analysis was run with Abaqus Standard. I have tried the same model using Explicit but the second step won't even start due to convergence. I tried contact between slab and beam.
I have tried the same structure with shell elements but still "no go".

Does anyone have references related to the topic? Thank you for any advice!

Regards everyone,


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Abaqus ver 6.13 - FSI modelling - CONFLICT error for CONTROLS keyword

 

Hi,

Getting an error when trying to emulate the FSI example from Getting Started with Abaqus: Interactive Edition manual : Appendix E: Flow through a bent tube

Section E.6.5 requires the addition of the following to the keywords, just after *Co-simulation Controls option block keyword

*Controls, type=FSI
, , , 1.1

However, the data-check on fluid model fails with following message

Error: in keyword *CONFLICTS, file "??????.inp", line ????: Keyword *Conflicts is generated by Abaqus/CAE to highlight changes made via the Keywords Editor that conflict with changes made subsequently via the native GUI.

The conflict is listed as the *Controls keywords added. The example runs successfully in version 6.12

Has anyone else had the same issue or been successful in running FSI modelling in version 6.13. Please advise what changes to the keyword file worked.

Thanks,

Miten

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Condition Number of Stiffness Matrix

 



I am dealing with laminated materials differing quite a lot in thickness and
stiffness of the layers. I have a full model with all layers in extra elements to determine non-linear shear, too.

Thus, I want to *extract the condition number of the global stiffness
matrix*.

I only found the element matrix output of the whole stiffness matrix, but
not the condition number!

Does anyone know a way?

And how about pre-conditioning?

Thanks a lot!

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febypa91@yahoo.in [Abaqus] | 25 Aug 16:52 2014
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Pre-loaded axisymmetric bolt joint

 

Hi,

I'm relatively new into the field of FEA (7-8 months). Most of my FEA work is done using ANSYS Mechanical APDL and Workbench. At my workplace, there is push to replace ANSYS with Abaqus. Us newbies are encouraged to work on Abaqus. Hence I was just trying out something on Abaqus. 

My problem is that I could easily simulate a bolted joint approximately in Ansys with an axisymmetric model where the bolt is modelled as a beam (BEAM4) with a pretension section on which the pre-tension load is applied. However in Abaqus I find that it is not so easy. 

I found an example problem in the Abaqus Documentation titled "Axisymmetric analysis of bolted pipe flange connections". Well, the problem is that when I try to import the include .inp file (boltpipeflange_axi_solidgask.inp), Abaqus thows up an exception

<<AbaqusException: Illegal mixture of 2d and axisymmetric elements. This occurred while creating deformable part PART-1. The part will not be created.>>

If I understand correctly, it has something to do with Part Dimensionality??

Could someone point me in the right direction. Most of my work include bolted joints. So need some quick method to get feel of the problem (before going in for 3D models).

I'm using Abaqus/CAE 6.13.1.iv>


Thank You

Feby Philip Abraham
 
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nautic46@yahoo.com [Abaqus] | 25 Aug 13:11 2014
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How do I model cyclic loading on rock in abaqus?

 

Hi,

I am a new abaqus user and I would like to simulate cyclic loading on a rock sample. Can anyone guide me on how to do this?

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Implicit dynamic quasi-static vs. Explicit quasi-static

 

Dear all,

I have seen a very interesting post about this topic in our group long time ago and now I would like to ask if any of you has used one of these procedure for a elasto-plastic structure.

I thank you in advance for your help and look forward to hearing from you.

Kindest regards,
Ken
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Assigning different sections / merge mesh

 

Hi !

I want to apply different material properties to the same part, but I don´t
know the best way to do this.

Should I just apply different section assignments (with different material
properties) to the part? Or should I merge two meshes of my part so as to
get one part with two elements above each other sharing the same nodes and
then, with two set nodes, applying the two section assignments? Is there any
difference?

I am using Abaqus CAE 6.13 Standard.

Thanks in advance.

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ErrElemVolSmallNegZero - What to do?

 

Hi there!

I've run into another problem. My assembly consists of several instances,
the meshes of the individual parts do not show any errors. But it seems that
due to the constraints/interactions used to connect the instances some of
the elements in the contact area are distorted an cause an error because
their volume is "zero, small, or negative"

These elements are all part of the same constraint.
Is there a way to prevent this from happening or what can I do to resolve
this?

Thanks for your help!

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Can anyone help with an error running UMAT subroutine in ABAQUS?

 

Dear all,

      I modeled triaxial undrained test by abaqus. I used Imam model for sand. I wrote that UMAT subroutine and linked with abaqus.  When I submit, the status is completed but when I want to see the results, I get this error "The selected primary variable is not available in the current frame for any elements in the current display group".

Could anybody help me?


Best Regards,

Atefe Geramian

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ErrElemVolSmallNegZero - Where is it?

 

Hi there!

So I've run into another problem. My simulation does not start due to
elements with volumes that are "zero, small, or negative". Abaqus also says
"The elements have been identified in element set ErrElemVolSmallNegZero.",
but I can't find that set. Where can I see which elements cause the problem?

I have several parts combined to an assembly and the errors seem to be
caused by constraints/interactions between the instances since all the
individual parts do not show any errors. I would be happy if you had some
hints on how to avoid this problem.

Cheers!

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Restarting a job

 

Dear Abaqus users, 

I am simulatin rolling process and I have a problem with restarting the job. After I asked for Restart in a job and I runned the job, I became an error in the job. After editing the model, I want to continue the job from a specific step. Therefore I edited the Attribute and set the step and odb file to restart the job. However after submitting the job, I got this error:

A NODE SET WITH THE SAME NAME "ASSEMBLY_Slab-Short Length-1-1__PICKEDSET17" DEFINED IN THE ORIGINAL ANALYSIS HAS BEEN REDEFINED IN THE CURRENT ANALYSIS. EXISTING SETS CANNOT BE MODIFIED IN A RESTART ANALYSIS.


I checked the whole model but I couldn´t find any mistake in the model (as mentioned in the error such node sets with same name). I was wondering could anyone give me a hint that what can be the reason?

Many thanks in advanced. 

Regards,

Farzad
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Gmane