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coupled temperature-displacement elements / how to mange the steps

 

hi all am trying to do heat analysis using coupled temperature-displacement elements , i thought that i can do a step for the heating first then applying the load that dont seem to work ! Any ideas please Regards Rwayda

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Posted by: rwayda <rwayda.alhamd <at> postgrad.manchester.ac.uk>
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Python script in linux

 

Hi all. 


I'm running a Python code in the abaqus scripting interface which takes stresses at each element, outputs them to another python file and carrys out a further analysis. I have the code running fine in windows however now I have migrated over to Ubuntu and I am getting a IO error when calling the python file using the same python script in windows. When it calls the file the following error occurs;


IOError: (13, 'Permission denied', 'Filename.py')


It obviously seems to be a permissions issue. My work directory and the python file I'm calling is in my home directory so I do not need sudo access to read/write/exe cute it. I have tried changing the file permissions for the .py file to read/write/execute for all owners,users and groups using chmod. However once changed and the script is reran the .py file is reverting back to its old permissions settings. 


Anyone have any ideas?


Thanks

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Posted by: gunningp93 <at> yahoo.com
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USDFLD to change material at critical temp

 

Trying to write a USDFLD subroutine to change the material at a certain temperature, 


for a simplified example 


i would have a set of elements with the material properties for Air and when the temperature reaches 1200deg these would change to a material eg a nickle based alloy


had a thought of defining tabular values to two field variables. but can't get the process to work 


do we think this is possible? 


any help would be greatly appreciated



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Posted by: sweenster_31 <at> yahoo.com
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load apply on each mesh node

 

Hello All,

I am doing research on composite in abaqus tool.


can anyone clarify my queries:


1. How to apply distributed load on edge of 2D model or shell?


2. How to apply point load at each mesh node?


Thank you

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Posted by: vinodshetty88 <at> yahoo.in
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Grain boundary sliding modeling

 

Hello all,

I am trying to model grain boundary sliding in abaqus. it looks like
cohesive contact should be used but didn't know how exactly. the grains are
only allowed to slide against each other and no separation is supposed to
happen. I tried few simulations using cohesive contact but all I could see
is either grain separation, grain deformation or meshes of two adjacent
grains overlapping, but no sliding. the grains have elasto-plastic
properties.

Please help.

Thank you in advance.

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View this message in context: http://abaqus-users.1086179.n5.nabble.com/Grain-boundary-sliding-modeling-tp22565.html
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Posted by: akh <ali.khadimallah <at> yahoo.fr>
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2D composite beam (with beam elements)

 

Hello

I am modelling in 2D a composite beam: steel profile and concrete slab; both are beam elements.

1. I made attachment points on both elements; and I creat ed a wire feature between them. After that I assigned the wire a connector section. The model is not working properly. Any suggestions how to realize the connection between them?

2. How can I add reinforcement (beam element) to the concrete slab and make an "embedded region" (like when you use solid elements) ?

Thank you!

Best regards,
Cristian
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Posted by: Miculas Cristian <miculas_cristian <at> yahoo.com>
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Convergence problem - Linear viscoelastic material

 

Hello Abaqus user,

I have developed a user material for hyperelastic and linear viscoelastic (2 maxwell chain). My Neo-Hooke hyperelastic UMAT works fine for different loading conditions and mesh size. However LVE UMAT gives convergence problem (time increment is too large) when i increase mesh size.

Any clue how can i resolve this problem ?



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Posted by: nirajnittrichy <at> yahoo.in
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frz_ti@yahoo.com [Abaqus] | 19 Feb 16:27 2015
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How to Optimize the ABD Matrix of a plate

 

Hi All


I am new to optimization , and I would like to know , how is it possible to optimize The ABD matrix of  a one layer orthotropic plate in Abaqus optimization ?


I know there is sizing possible , but I would like to optimize the whole ABD Matrix , shall you guide me how to ?


thank you very much

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How to calculate back stress in abaqus?

 

I am doing a fatigue analysis for a component which is manufactured by stamping simulation


From the stamping simulation results , I have taken plastic strain alone.

I am doing a nonlinear static analysis in ab aqus.

I am using the below command

*INITIAL CONDITIONS,TYPE=HARDENING,SECTION POINTS

If I am using this command, it is asking back stress value.

What is meant by back stress? How to calculate the back stress ?

Can anybody answer for this question


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Rotating 3D deformable parts in Abaqus Explicit

 

I am trying to model the dressing process of a grinding wheel by using Abaqus Explicit 6.13. The main goal is to rotate both dressor and grinding wheel against each other and produce erosion in grinding wheel.

I am facing problem in modelling the rotation of the wheels during the explicit analysis. I can easily rotate the wheels against each other in Abaqus Standard by using coupling constraint. However, when I try to do the same in the explicit analysis, the wheels do not rotate rather the constrained surf aces started distorting. I have shared the CAE file at the Dropbox link below with both standard and explicit models.

https://www.dropbox.com/s/pbp5q7ns9ryrd1n/standardvsexplicit-rotation.cae?dl=0

Could anyone please tell me how I can fix the rotation problem in explicit analysis? Any help will be highly appreciated. If possible can anyone please send a CAE or inp file with rotation in exp licit analysis at saqibuetian <at> yahoo.com


Regards


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Kinematic coupling to allow expansion of pipe end.

 

Hi all;

I'm modelling a pipe elbow, which has fixed free ends and I want the fixed end to be able to expand when subjected to internal pressure. So, I thought to assign a kinematic coupling at this end and couple it with a reference point at this surface which will be the center point of the pipe. When i do this i get a lot of errors related to the coupling constraint as follows;

"Whenever a translation (rotation) dof at a node is constrained by a kinematic coupling definition the translation (rotation) dofs for that node cannot be included in any other constraint including mpcs, rigid bodies, etc.

MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM"


Can someone help me with this please. 
Thank you

--
Best Regards,
Diana Abdulhamid
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Posted by: Diana Abdulhameed <dabdulha <at> ualberta.ca>
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Gmane