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Help with Abaqus Stress tensor from STRESS(NTENS) in UMAT

 

Hi, I am new in evaluating the stresses using user subroutine. It would be great if someone could help me.

So when I call STRESS tensor, how does it build up? Is it STRESS(1)=S11, STRESS(2)=S22, STRESS(3)=S33, STRESS(4)=S12, STRESS(5)=S13, STRESS(6)=S23.

And if I use CALL SPRINC(S,PS,LSTR,NDI,NSHR), the Principle values are like PS(1)=Max. Principle, PS(2)=Mid. Principle and PS(3)=Min. Principle?

Thank you so much for you support.
Best Regards



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Posted by: Soud Farhan <soudchoudhury <at> gmail.com>
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Interaction modeling in friction stir welding process

 

Dear friends,


I have developed a model in Abaqus which includes a rotating tool (Lagrangian part, modeled as a rigid body) a workpiece modeled as an eulerian part with Johnson-Cook constitutive model, discrete field with a volume fraction tool, and a backing plate modeled as a lagrangian part (linear elastic).
As far as I know, the contact between lagrangian and eulerian parts is modeled as a general contact, but when two different such types of contact have to be specified in the same assembly, the definition of two types of general contact is not allowed (in Abaqus/CAE).
I would like to ask you, how is the contact between Eulerian and Lagrangian parts modeled in Dynamic Temperature-displacement analysis in Abaqus/E xplicit? What are the available options?

Thank you very much in advance for your response.

_______________________________________________
George Papazafeiropoulos
Captain, Infrastructure Engineer, Hellenic Air Force
Civil Engineer, M.Sc., Ph.D. candidate, NTUA
Email: gpapazafeiropoulos <at> yahoo.gr
Website: http://users.ntua.gr/gpapazaf/





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Posted by: gpapazafeiropoulos <at> yahoo.gr
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Problem with submiting abaqus parallel job on windows hpc server?

 

HI,i recently created a HPC cluster on windows HPC server 2008 r2.

My purpose of doing this is to submit ABAQUS jobs in DMP (Distributed Memory Processing) because my model is too big and i need to submit it on HPC cluster. as usual i install ABAQUS on cluster and in GUI environment i submit job and i got this error:

 "Error in job Job-1: Failed to execute "hostname" on host "node1". Please verify that you can execute commands remotely on "node1" without a password.

Command used: "D:\Program Files\Microsoft HPC Pack 2008 R2\bin\mpiexec.exe -wdir D:\Windows -hosts 1 node1 1 -env PATH D:\SIMULIA\Abaqus\6.14-2\code\bin;D: 92;Windows\system32 D:\SIMULIA\Abaqus\6.14-2\code\bin\dmpCT_rsh.exe hostname".


I think ABAQUS doesn't install in right place so question is: 

1) how i can install ABAQUS on this windows cluster (for example make shared directory and install abaqus in it) 

2) How can i submit my parallel job on this cluster                

 

p>
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Crystal Plasticity FEM

 

Hi All,

I want to simulate indentation on single crystal FCC metal. I tried by using Huang's UMAT code. But it was not running well. I will be grateful if somebody help me or give some directions.

Regards,
Arun Kumar A
M-Tech Student
IIT Delhi
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Posted by: ARUN KUMAR <arunkumarputhoor <at> gmail.com>
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Kinematic Hardening Parameter Calibration

 

Hey All, Just wondering for calibrating the data, how do I convert a stabilized stress-strain curve to a stress - plastic strain curve. I know normally you just use the equation involving elastic and total strain but that would simply shift the graph rather than create straight lines from yield to max/min? Searched everywhere and can't find a solid description. Any help is greatly appreciated. --

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subroutin for welding simulation

 

Dear All.Help me please.So I can Gldak theory I apply on the simulated welding subroutine.
engineer.mec2009 <at> yahoo.com

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Indentation Simulation

 

Hi All,

I have modeled an indentation test using a cono-sherical indenter. But it
is not running well. This is the first time I am doing a contact problem.
The error may be obvious to many of you. Please help me. The CAE file is
attached here.

Regards
Arun Kumar A

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

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Goodman Evaluation Plug-in Abaqus Answer #724

 

Dear all:


I'd like to perform Goodman Plot with Abaqus Goodman Evaluation Plugin( Abaqus Answer #724), but the abaqus custhelp site( http://simulia.custhelp.com) is not available. Is there anyone could provide the plug-in file?


thanks


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NFORC Field Data is not consistent and has odd X/Y report with "NoValue"

 

Hello,

I am having an issue trying to resolve Nodal Forces (NFORC) in an Explicit model. I have defined node sets that I am interested in, basically slices into my part, which is a flat rectangular plate.  When I look at the field data everything seems normal.  I can generate the data within the viewer, which shows the correct node count.  When I save that to an X/Y table (rpt), I find there are extra (duplicate) time steps with "NoValue" peppered throughout, and the report files are drastically different sizes per slice, even though each slice contains the same number of nodes and data.  For instance:

slice1.rpt = 1.17 MB
slice2.rpt = 3.55 MB
slice3.rpt = 8.01 MB (Same for 4 and 5)

slice1.rpt = 115x550
slice2.rpt = 353x550
slice3.rpt = 801x550

My model only has 101 time steps.  So why does slice1 pickup an extra 14 and slice3 picks up an extra 700?  When I investigate each of these, there are extra rows for the same time step (seemingly at random), where one row will have all the data as you would expect to find it. Then the next row is the same time step, some cells have different values in them, but the majority are listed as, "NoValue".

Screenshot of slice1.rpt: http://i.imgur.com/gMcdIXq.png

Screenshot of slice3.rpt: http://i.imgur.com/ksOm8Tk.png

Looking at the slice3 screenshot, you can see that I have 8 rows that represent timestep 5e-7. 4 of those rows show "NoValue" (if you keep scrolling right, some of those "NoValues" turn into values.  The other 4 rows are fully populated with values.  What am I looking at?  How can I determine what is valid?

Kindly,

-Steve


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Posted by: Steve Pagano <sjpagano <at> gmail.com>
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arirrr@yahoo.com [Abaqus] | 26 Jan 12:43 2016
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Solving peak load when strain reaches 20%

 

 

Hi all, 

I'm using Abaqus implicit to model behavior of steel truss joint. 

I want to stop the analysis until plastic strains reach 20% and solve that load. 

How can I do this? 
Or should I go for explicit? 

Many thanks for your help 


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Epoxy and Welding

 

Dear All, 


I am structural engineer and I want to model epoxy and weld in my model and also see the stresses on them. 


Your guidance is appreciated in advance.


I am looking forward to hear from anyone who has done something close to this matter.


Regards,

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Posted by: ramin.vaghei <at> gmail.com
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Gmane