Hello everyone,
I am modifying some properties in python script in order to understand which properties affects more the triaxial braided composite. Now i am changing angles between the straight yarn and the angled yarns but i have a problem because the path of the yarn is not smooth at all. Does anyone can help me with this problem?
Thank you very much.
Nicolo'
triaxial braided composite: yarn is not smooth
Moderators: Martin, Developers
-
nicolo.bortone
- Posts: 5
- Joined: Fri Oct 11, 2019 1:15 pm
triaxial braided composite: yarn is not smooth
- Attachments
-
- This is the screen of my problem(see green yarn to better understand)
- CaptureForum.PNG (66.86 KiB) Viewed 9324 times
Re: triaxial braided composite: yarn is not smooth
Hi Nicolo',
It's not easy to see exactly what's going on without having the nodes and paths rendered so that it's possible to see where the start of the yarn repeat is. Have you introduced a discontinuity between the start and end of the yarn? Is the angle at each end the same?
It may also be easier to see what's going on if you use the x-ray rendering so that you can see what the surface mesh is doing.
Hope that helps,
Louise
It's not easy to see exactly what's going on without having the nodes and paths rendered so that it's possible to see where the start of the yarn repeat is. Have you introduced a discontinuity between the start and end of the yarn? Is the angle at each end the same?
It may also be easier to see what's going on if you use the x-ray rendering so that you can see what the surface mesh is doing.
Hope that helps,
Louise
-
nicolo.bortone
- Posts: 5
- Joined: Fri Oct 11, 2019 1:15 pm
Re: triaxial braided composite: yarn is not smooth
Dear louisepb,
Thank you for your help. I have not introduced a discontinuity between the start and end of the yarn i think and the angle at each end should be the same. I am only varying some matrix and yarn properties to see hot the properties of the composite change. The only problem is when i change the angle from 60 degrees between the straight yarn and the angled yarn. It seems strange to me that the path of the yarn is not smooth but i don't know why. Any ideas?
Thank you again.
Nicolo'
Thank you for your help. I have not introduced a discontinuity between the start and end of the yarn i think and the angle at each end should be the same. I am only varying some matrix and yarn properties to see hot the properties of the composite change. The only problem is when i change the angle from 60 degrees between the straight yarn and the angled yarn. It seems strange to me that the path of the yarn is not smooth but i don't know why. Any ideas?
Thank you again.
Nicolo'
- Attachments
-
- texgenForumW.docx
- This is the python file i am using. Hope it helps
- (13.54 KiB) Downloaded 154 times
Re: triaxial braided composite: yarn is not smooth
Hi Nicolo,
I have run your script. By making the domain larger and using the x-ray rendering it is possible to see what is going on. The image shows that the ends of the repeating yarns do not match. I haven't checked what the figures should be but it looks like your repeat in the y direction is no longer correct for the angle of yarn.
Best wishes,
Louise
I have run your script. By making the domain larger and using the x-ray rendering it is possible to see what is going on. The image shows that the ends of the repeating yarns do not match. I haven't checked what the figures should be but it looks like your repeat in the y direction is no longer correct for the angle of yarn.
- NicoloBortone.png (1.55 MiB) Viewed 9314 times
Louise
-
nicolo.bortone
- Posts: 5
- Joined: Fri Oct 11, 2019 1:15 pm
Re: triaxial braided composite: yarn is not smooth
Thank you very much for this notation. Do you have any idea of how can i change this not smooth effect? I tried to change the RVE dimension but there is no change.
Thank you again.
Thank you again.
Re: triaxial braided composite: yarn is not smooth
Hi,
Changing the size of the domain will just help you to see what the problem is.
If you look at the image in my previous message you'll see that the ends of the yarns are discontinuous. This implies that the repeat specified is incorrect for the nodes specified. Looking at yarn 1 node 1 is at 0,0,2 and node 4 at 2,-1.22822,0,2. You've specified a repeat vector in the x direction of 2 which is correct for the offset in the x direction. In the y however it looks like you've specified a repeat of half the y offset, however this has been given as 0.573350 wheras half of the y offset between the start and end nodes (0 & 4) is 0.61411. If you change the repeat to this you'll see that the repeats now line up and the yarn is continuous. You'll need to do something similar for yarn 0.
Hope that helps,
Louise
Changing the size of the domain will just help you to see what the problem is.
If you look at the image in my previous message you'll see that the ends of the yarns are discontinuous. This implies that the repeat specified is incorrect for the nodes specified. Looking at yarn 1 node 1 is at 0,0,2 and node 4 at 2,-1.22822,0,2. You've specified a repeat vector in the x direction of 2 which is correct for the offset in the x direction. In the y however it looks like you've specified a repeat of half the y offset, however this has been given as 0.573350 wheras half of the y offset between the start and end nodes (0 & 4) is 0.61411. If you change the repeat to this you'll see that the repeats now line up and the yarn is continuous. You'll need to do something similar for yarn 0.
Hope that helps,
Louise