abhiajri@gmail.com [Abaqus] | 28 Mar 01:44 2015
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Orthogonal cutting damage layer definition.

 

Hello everyone,


I am presently working on the modelling of orthogonal cutting process using ABAQUS. I was successfully able to validate the results using the ALE approach but I observed that there is a small hump like structure created at the start of the machining process, which looks a bit unrealistic.This paper may help you understand what the problem is :- http://www.researchgate.net/profile/Jafar_Takabi/publication/255610812_Simulation_of_Orthogonal_Cutting_Process_Using_Arbitrary_Lagrangian-Eulerian_Approach/links/004635222278b5818a000000.pdf.


Is there anyway to avoid this problem?



Also, there are a few papers wherein they have introduced a damage zone (sacrificial layer) where the elements get deleted and the chip forms as the tool progresses along the workpiece. Has anyone in this group worked on this approach before.For example the following paper, has used the approach to get the results:-

Eu-Gene NgDavid K. Aspinwall, "Modelling of hard part machining", Journal of Materials Processing Technology, Volume 127, Issue 2, 30 September 2002, Pages 222–229

 http://www.sciencedirect.com/science/article/pii/S0924013602001462



Thanks for your help and time,


Sincerely,

Abhishek Ajri

Graduate Student

Purdue University

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Python scripting

 

Dear frens


In abaqus is it possible to increse or decrese the number mesh element by scripting in python.
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homogenization with truss elements

 

Dear all,

I am doing homogenization for a truss lattice material. At the moment, I am writing a Python code to post-process the odb obtained from meso-scale analysis to extract the effective elastic constants. To do that, I have to transform the stress components of truss elements into global coordinates. However, it is impossible in ABAQUS to do that with truss elements. As mentioned in ABAQUS, the transformation is not supported with truss (beam) elements.

If someone knows how to tackle the problem, please kindly let me know.

Thanks in advance.

Best regards,
Ken
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Random error in abaqus noGUI

 

Hi all,

I'm working on my masters thesis, and for this purpose I want to run a
fairly large set of calculations by calling abaqus cae through matlab.

I have a script that works fine through the GUI but when calling it from
MATLAB without GUI, i get an error which appears sometimes, and at
random, even when running the same script over and over again without
modifying input.

The error message found in the .dat file (job name is MISESLIN) reads:

***ERROR: Unable to open the file <rank=0, arg_name=outdir>MISESLIN.mdl

and subsequently:

***ERROR: An error occurred during a write access to <rank=0,
arg_name=outdir>MISESLIN.mdl file. Check the disk space on your system.

I might add that the disk space is 60GB in the work directory and that it is
a small model of a stiffened panel. I’ve tried redoing the script by recreating the problem through the GUI, and the same problem appears for these scripts.

I would be EXTREMELY grateful for any assistance on the matter, since my
thesis more or less depend on this to work…

All the best,

David Larsson

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problem of adding load on a tire model to see its deformatiom

 

Hi all,

I am trying to do the simulation of lying a tire model on the ground horizontally and adding load on its sidewall to see its deformation.
I have alre ady had my 2D tire model and it runs well. I think there is something wrong in my 3D input files since the msg file keep showing the error as:

MAX. PENETRATION ERROR 28.4217E-15 AT NODE 34677 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
MAX. CONTACT FORCE ERROR -3.58178 AT NODE 58678 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
THE ESTIMATED CONTACT FORCE ERROR IS OUTSIDE OF CONVERGENCE TOLERANCES.

MAX. PENETRATION ERROR 235.391E-03 AT NODE 67678 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
MAX. CONTACT FORCE ERROR 913.912 AT NODE 67678 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)

PENETRATION ERROR TOO LARGE COMPARED TO DISPLACEMENT INCREMENT.

 ***NOTE: SEVERE CONTACT OVERCLOSURES EXIST. CONVERGENCE IS JUDGED UNLIKELY.
 
 ***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT

Therefore I just attach the 3D input files. http://files.engineering.com/getfile.aspx?folder=380cce34-2e3b-40be-b9a1-dap://
Cou ld anyone please tell me how to solve this problem?
THANK YOU VERY MUCH.

Best Regards,
Jay
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problem of adding load on a tire model to see its deformation

 

Hi all,

I am trying to do the simulation of lying a tire model on the ground horizontally and adding load on its sidewall to see its deformation.
I have already had my 2D ti re model and it runs well. I think there is something wrong in my 3D input files since the msg file keep showing the error as:

MAX. PENETRATION ERROR 28.4217E-15 AT NODE 34677 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
MAX. CONTACT FORCE ERROR -3.58178 AT NODE 58678 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
THE ESTIMATED CONTACT FORCE ERROR IS OUTSIDE OF CONVERGENCE TOLERANCES.

MAX. PENETRATION ERROR 235.391E-03 AT NODE 67678 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
MAX. CONTACT FORCE ERROR 913.912 AT NODE 67678 OF CONTACT PAIR 
(SIDEWALL-UP,SROAD)
PENETRATION ERROR TOO LARGE COMPARED TO DISPLACEMENT INCREMENT.


 ***NOTE: SEVERE CONTACT OVERCLOSURES EXIST. CONVERGENCE IS JUDGED UNLIKELY.

 

 ***ERROR: TOO MANY ATTEMPTS MADE FOR THIS INCREMENT


And I just attach the 3D input files. 
ENGINEERING.com | File Downloads

Could anyone please tell me how to solve this problem?

THANK YOU VERY MUCH.

Best Regards,
Jay


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haabtam55@yahoo.fr [Abaqus] | 24 Mar 14:57 2015
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STATEV in FRIC subroutine

 

Hello,


I have some questions about FRIC subroutine.
I want to program a new friction model in Abaqus (based on the Dahl and LuGre models), with an internal variable to integrate. So I need to use a state dependent variable with FRIC subroutine.

A STATEV (state dependent variable) was used and their numbers was specified in the definition of tangential contact properties.
The following message appears:

***WARNING: OUTPUT VARIABLE SDV HAS NO COMPONENTS IN THIS ANALYSIS FOR ELEMENT TYPE CPS.


After that, I’ve set SDVs in material property, the WARNING message is gone, but the values of SDV are zeros.


1- Can you help me to solve this problem? (Or how can I save the SDV from FRIC subroutine in the ODB file?)


Thanks


Abdallah

Ph.D Student in Mechanical Engineering

Applied Mechanics Section

Ecole Polytechnique de Montreal, Canada



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modelling a pipe elbow using pipe elements

 

Hello all,

I'm starting a new research on pipe elbows and i am trying to assign the pipe geometry (Part) a section with a pipe element so it can be affected by the internal pressure of fluid in the pipe. 
I would like to know how to use the pipe element. Should geometry be defined as a beam or shell ? I can't find any sections as "Pipe".

Thank you

--
Best Regards,
Diana Abdulhamid
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Cut thread in shaft

 

Halo
Can you guys tell me how to make threaded shaft in abaqus

Thank you


Sent from Samsung Mobile.
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element birth and death method for line elements

 

hi all,

 i need to do element birth and death method for a steel lattice tower. i modeled the tower using beam element B31.
For element deletion i know that i have to specify the number of solution dependent variables and variable number controlling element deletion in depvar. How can i identify these numbers? 

also i dont know about vumat coding.

can any body explain me about this.. your help will be greatly appreciated.


greetings..

dileep

   

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Run input file (.inp) for analysis in Abaqus/CAE

 

Hey guys,


I am starting to use Abaqus, so I would like to run (or open) some existing analysis input file (.inp) with Abaqus/CAE. How should I do to Open it? I tried to use DOS command by typing "call abaqus job=<input file name>, however, it doesn t work! The working directory précised in the DOS command is C:\Temp. The input file I want to open is also already copied in that directory. Hopefully someone here could help me. Thanks guys!


Willy

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Gmane