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Property of damaged cohesive interaction after import

 

Greetings, 

I am now modeling an abaqus model with cohesive interaction between two domains. The cohesive interaction is traction separation law with damage initiation and linear evolution. 
After a general static step, the interaction face of two domain deforms and some part of it enter the damaged domain of interaction. I activate the restart option so that it output .res file so that I can import the material state into anther model, change some BC and do a linear perturbation step to analysis. 
I am a little confused when I run the linear perturbation step, what properties of cohesive interaction does abaqus use from the imported cohesive interaction? To be specific, am I using the damaged stiffness of interaction or the init ial stiffness? I looked up the documentation, abaqus is using t(traction) = G(damage index)*K(initial stiffness)*e(seperation) where G is assign according to the damage criterion. So the stiffness of interaction it uses is GK or K or the negative stiffness within the linear evolution phase? 

Thanks,


Qianli


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Posted by: qianlichen28 <at> yahoo.com
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Nonlinear Analysis of Steel Frames without Axial force in Beam

 

Dear All,
Hello

I am trying to model a simple one-bay steel frame using nonlinear analysis in Abaqus. I do not know how I should exert the lateral load and boundary conditions in order to avoid any axial force in the beam.
It should be mentioned that I turned on the Nonlinear Geometry (NlGeom), so there is a large amount of axial force in beam that cannot be ignored.
I would appreciate it, if someone could help me to do this.

Regards,
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Posted by: mahdi sharifi <sharify_mahdi <at> yahoo.com>
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mass diffusion submodel

 

Hello everyone,

Is the submodelling working for mass diffusion? I can't get the boundary condition from the global model to the submodel, it supposed to be interpolated from the global model, but all I get is 0 at the boundary.

Thank you for your help!

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Posted by: godblessfq <at> gmail.com
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Abaqus explicit Aluminium Can Crush simulation video

 



This video explains step by step method of how to do the Aluminium Can crash test using Abaqus explicit (quasi static simulation). We have made this video to help Abaqus community to understand the fundamentals of the Abaqus Explicit, while demonstrating example set up using Abaqus CAE pre and post processing. With special emphasis on prescribed displacement, self contact, F-D curve plotting.
-Abaqus Acumen
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odb content reduction

 


I wonder whether Simulia ships a program with Abaqus that allows to reduce the content and thus the disc space of the odb. Sometimes one might have forgotten to deactivate some default output which one wants to get rid of without additional analyses.

Does someone know or programmed it himself?

Thanks, Thomas


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Posted by: thomas.zander <at> charite.de
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connecting solid elements and beam elements

 

Hello all, 


How to connect a solid element's node with beam element's node ? 


Thanks,

Arun

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Posted by: arunudayakumar <at> yahoo.in
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Hertz Contact Analytical Solution

 

I am trying to replicate the abaqus bench mark problem for Hertz contact. I have been facing some trouble comparing the analytical solution to the FEA results for the hertz 2-d model as shown in the abaqus benchmark problems. In particular, I was trying to replicate the Figure 1.1.11–2.  The only reference provided there is from Timoshenko and goodier but I am unable to obtain the same analytical solution as the one shown in abaqus documentation. 
Could someone please help me out in understanding if there is something I am doing wrong with respect to the analytical solution? Or a reference for the analytical solution. 

Thanks , 
Nikhil NoronhaUniversity of Cincinnati 

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

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Posted by: nikhil noronha <nik.noronha <at> yahoo.com>
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Initial pressue and elastic tensile strength problem in Abaqus

 

Dear collegues,
I am doing  consolidation problem for saturated 1 m clay layer with 6 m sand layer above.
ABAQUS is used.
 
The model of soil - Cam-Clay. 
Initial stresses in the soil are given. 
The initial pore pressure as well set. 
Material data is fully specified. 
I just keep getting the following error message:
The sum of initial pressue and elastic tensile strength for the porous elastic material in element 1 instance part-1 must be positive.
  Would you advise what can I do to solve this issue.

Thank you
Sal
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Posted by: salman shawket <salman_shawket <at> yahoo.com>
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Find membrane stress

 

Dear all, 
Good day. Could someone please tell me how to find membrane stress. I modeled a plate with shell element and run linear elastic analysis. I already tried 'Field output dialogue>section points>plies>middle /single section point'. If I am not wrong membrane stress is the constant stress over the plate. 

Thanks in advance. 
 v>
Thanks & Regards,
Md Habibullah Bahar

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Posted by: Habibullah Bahar <habib2838 <at> yahoo.com>
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Complex value output in Abaqus

 

Dear All, I want to ask if anyone is familiar with Complex value representation in Abaqus output ? Actually when u select MAGNITUDE as numeric form output for a complex output like in SSD analysis , this MAGNITUDE should be the square root of sum of squares of real and imaginary parts. BUT this does not hold for Reaction charge ['RCHG'] output values in a piezoelectric analysis. The magnitude is not the complex magnitude of the real and imag parts but scaled to some value. For other variables like Translational velocity['VT'] , it matches. SO anyone having any idea if how this MAGNITUDE representation is calculated for complex values / Are there any exceptions for some output variables ?? I am really stuck due to this .. Any help would be really grateful guys ... T hanks a lot . Regards Ashish --

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Posted by: "ashish.pandey" <fixed-term.Ashish.Pandey <at> de.bosch.com>
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time variable in uanisohyper_inv

 

Dear group members,

I am interested in coding a time varying parameter in the uanisohyper_inv subroutine. However, time isn't provided in this subroutine. Although I have managed to bring in time via a not-so-pretty route, I would like additional options.

What I have done is have uexternaldb write out time to a text file and then in the uanisohyper, I read the contents of the text file.in. While it does the job, it isn't a great solution for me because of its cumulative computational expense (for the kind of problem I am going to be running the subroutine with).

I do not wish to use COMMON blocks either (for well documented reasons).

So, is there an alternative that uses an Abaqus subroutine/utility/function/variable that will admit this hack?
Thank you,

Vikas

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Posted by: vikas_hcl2001 <at> yahoo.com
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Gmane