data analysis of dry fibre simulation

[dyeyanie]

Hi Louise,

I have imposed a transversely isotropic material to my geometry where I modified the default setting. I also imposed a uniaxial tension in X direction on my geometry. From there, I extracted the output to get the relationship on stress-strain. The problem now is I obtained some negative values on my E22. I don't know the reason behind this. Perhaps I might be worngly selected the elements or nodes. Do I need to get the output data for one node point or a dummy node to cater this problem?

Yanie

[louisepb]

Hi Yanie,

You won't be able to find E22 by applying a load in the x direction. You need to apply a load in the y direction to obtain this.

Louise

[dyeyanie]

Hi Louise,

True, I understand that but the question now, I have a transversely isotropic material and I'm pretty sure there is an effect on y-direction even I imposed a uniaxial loading in x-direction.

Yanie

[louisepb]

Hi Yanie,

Sorry but I'm struggling to understand what your textile now looks like and exactly what you're trying to do. Maybe you could send more detail?

Louise

[dyeyanie]

Hi Louise,

I have some questions regarding the input and output of TexGen-Abaqus. I chose dry-mesh option for my model. Initially, I just remain the setting that I've obtained then I changed the material properties to a transversely isotropic material. However, the output from isotropic(default value) and transversely-isotropic materials are totally unsatisifed. The attachment as follows. I'm not really sure why these things happened because when I ran a plain weave with a default setting, everything was fine.

Yanie

[louisepb]

Hi Yanie,

In the dry fibre analysis the centre point of each to is fixed to avoid rigid body motion. It looks like you may need to check the loading that you have applied to see if it is giving a sensible response. You may need to check that the damping applied is appropriate for your simulation.

Best regards,
Louise

[dyeyanie]

Dear Louise,

I did changed the damping values. I've tried from 1e-9 to 1e3 but it still doesn't suit my simulation. I'll check it again.

Yanie

[maryam_sodagar]

Hi Louise,

I have tried another options of meshing in TexGen and I ran them. I found several warnings in my data file.
1. ***WARNING: ELEMENT TYPE C3D6 USES THE REDUCED INTEGRATION IN Abaqus/Explicit AND WILL BE REFERRED TO AS C3D6R FROM HERE ON
2. ***NOTE: DUE TO EXCESSIVE REPORTING, THE ECHO OF THE *SURFACE OPTION IS BEING
SUPPRESSED.
3.***WARNING: THE PARAMETER HOURGLASS ON THE *SECTION CONTROLS OPTION IS
RELEVANT FOR SOLID, MEMBRANE, AND SHELL ELEMENTS WITH REDUCED
INTEGRATION WHEREVER APPLICABLE. THIS WARNING CAN BE IGNORED IF
THE FEATURE IS APPLIED TO THESE ELEMENT TYPES ONLY.
4.***WARNING: NODE SET DOMAIN HAS NO MEMBERS AND WILL BE IGNORED. NODES DEFINED
IN THIS SET MAY HAVE BEEN DELETED BECAUSE THEY WERE NOT CONNECTED
TO ANY ELEMENTS.
5.***WARNING: THE OPTION *BOUNDARY,TYPE=DISPLACEMENT HAS BEEN USED; CHECK STATUS
FILE BETWEEN STEPS FOR WARNINGS ON ANY JUMPS PRESCRIBED ACROSS THE
STEPS IN DISPLACEMENT VALUES OF TRANSLATIONAL DOF. FOR ROTATIONAL
DOF MAKE SURE THAT THERE ARE NO SUCH JUMPS. ALL JUMPS IN
DISPLACEMENTS ACROSS STEPS ARE IGNORED

I don't really understand how to overcome this warnings. I really appreciate your help then.

Yanie

Hi
I wanna know more about solving the third problem which you have had. Could someone please help me....

[louisepb]

Hi,
Please could you be more specific about the problem you're trying to address?

Thanks,
Louise