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Hourglass and shear-Locking in FEA/FEM
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- čas přidán 2. 05. 2019
- In FEA Hourglass and shear locking are two major issue bcz they may mislead the results drastically. However, very few Example and video tutorial available on such. Therefore I tried to explain those-
major concentration points are -
1. Excessive deformation by hourglass
2. Why hourglass appears?
3. Formulation of hourglass energy in element.
4. How to diagnosed hourglass ?
5. How to address Hourglass ?
6. Cantilever Beam example with Analytical Proof.
7. How to use Full integration element in Radioss and Abaqus to overcome the hourglass.
To know more plz check playlists.
For related questions & discussion you can contact me on +917891401376. or mail me gkn0504@gmail.com
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without annoying background music, it is a very informative video
You’re videos are always very packed full with quality information that is many times not available in schools.. I also pay extra attention whenever you say “see”
Thanks for appreciating my work dear.
Excellent performance sir. Thanks a lot
As same as all time, perfect.
Keep going sir.
Thanks for appreciating my work dear.
Could you update this video again without background music?
I'll try..if it is possible to remove background music without loosing views on video.
Just went through your video on Hourglass and also your profile in LinkedIn! Really appreciate the way you have explained considering your experience in the field of CAE
With little fine-tuning , it can be more amazing -Gautam Nagaraj
Thanks for appreciation dear.
I suggest to go with more videos of playlist - Abaqus. You will find other conceptual videos.
Years back i was stucked due to hourglass issue...so i decided to understand it completely...and after understanding i shared the knowledge..!
Dear Sir,
Thank You so much. This video was very informative and helpful to understand one was the major problems I was facing to overcome related to hourglass... and the background music is great :)
Welcome dear.
very well explained!
Thank you Sir!
Can this video be uploaded without music? Great content but the music is distracting.
Dear,
Plz try to listen without earphone/headphone, the background music will be less.
That time to suppress background noise i added background music, but i stopped adding background music now. Sorry for inconvenience.
Thanks a lot for the video. The concept is very clear, your pace is also good. Don't worry about the background music, it's not bad. I can hear you without any difficulty. I have one question, in 14:25 you said that the laminar should not distort and it should be 90 degrees. From this, do you mean that since elements are very small and thin, it comes under Euler Bernoulli beam theory? Because we take this assumption in Euler Bernoulli beam and do not hold good in Timoshenko beam . Thanks in advance. Keep it up. Great video. :)
Dear,
It is lamina not laminar, I meant to say the dotted lines in the element during bending.
And thanks for appreciating my work.
Thank you sir. Please keep uploading more...
Yes sure.
Keep shearing.
Nicely explained, Keep it up.....
If you like containts. Keep knowledge sharing.
Very helpful Gajendra 👍🏻
Thank You, Sir, I was facing the same Hourglass error and I didn't know why this was happening, but this video clears my confusion. And one thing more I want to ask that how to plot the energy graph in Abaqus? as you plotted in Hyperwork.
Visualization - Main Menu - Tools - XY Data - Create - ODB history output - Artificial Strain Energy (ALLAE).
Here the ALLAE is artificial energy (Hourglass Energy).
You can compare ALLAE with ALLIE (Internal Energy).
Always welcome.
on 21:36 the labels "With Hourglass Control" and "Without Hourglass Control" are in exchanged places.
Thank you for the class!
Yes..in ppt there is mistake. But explanation is correct.
thank you very much for these video ,In machining what the benefit of using elements with reduced integration and hourglass control in abaqus?
Dear,
Reduced integration scheme can save computation time.. but you have to make sure they should not be subject to hourglass.. it may possible to reduce/eliminate hourglass by fine mesh and hourglass control mesh.
thank you so much for detailed explaination.
Always welcome dear,
I suggest you, go through other conceptual videos on my channel.
sure sir. keep uploading..
Bahot bahot Dhanyavaad GuruJi. 😀
Welcome dear.
@@simtech0598 😄
I'm using abaqus explicit for low velocity impact on composite laminate, after no. of tries like refining mesh, setting different hourglass controls for SC8R elements, I can't remove hourglass effect.
Can you please help me with this?
Please provide visuals of model or share models on my mail.
Very good explanation.
Thanks for appreciation dear. Share knowledge with others too.
@@simtech0598 Additionally I also referred to some more information regarding shear locking and hourglass.
Shear Locking: This explains the shear locking issue. femds.com/FEM_Guidelines/Prevent_Shear_Locking
Hourglass: Some mathematical explanation of hourglass effect. imechanica.org/node/1459
Yes, shear locking explanation is good there.
Thank you sir
Always welcome dear.
Thank you so much for your work sir, can I please ask in Abaqus, is the distortion control has the same function as the hourglass control?
Dear,
Both are different.
@@simtech0598 Thanks for your reply. The reason for my question is from another possible error in Abaqus due to bad meshing: “ deformation speed to wave speed ratio exceed 1”. In my case, both hourglass and the aforementioned error can be solved by either using distortion control or hourglass control. So just wondering if these two control parameter have the same function, such as both of them constrain the maximum element distortion rate to avoid failure.
Dear,
Hourglass control based on element formulation and i believe "deformation control" that u r using is Available by solver control.
Sir, How about the hourglass control for machining Simulations. Can I go for Enhanced hourglass control?
Dear,
Make sure minimum 3-4 layers of element above the cutting plane. Even more, if you can afford as per ur computational power.
If you performing simulation with Lagrangian mesh **
Default Enhanced hourglass control will work most of time.
Hi. Nice video. Do you know how can you plot the Hourglass energy in Abaqus?
Dear,
Request for ALLAE in history output (default checked on) and Plot it in post-processing.
God bless you!
God bless you too.
Thank you!
sir in abaqus does we have hour glass energy? or it is called by other name
In abaqus it known as artificial energy.
@@simtech0598 Thank You sir.
Thank you , Sir.
Always welcome dear.
@@simtech0598 Please recommend literature related to hourglass and shear locking.
Dear,
Video already uploaded on hourglass and shear-locking - czcams.com/video/lqLlpLFV53Y/video.html
can you make a detailed video about the step module?
Yes sure.
Will upload soon.
I'm interested to learn from this video, but truthfully it's very hard to understand your pronounciation over the background music at times.
Dear,
Now days I'm trying to upload videos without background music. May on those videos you will not face such issue.
sir how can we create an underreamed pile in abaqus
Same as general piles..with modified geometry.
@@simtech0598 sir can u plz explain how we can give that bulged portion in the pile
Dear,
Its a CAD modelling part. If u feel difficulty in Abaqus...u can do it any CAD software and call in Abaqus.
@@simtech0598 ok
Remove the background sound
Its irritating while listening to your lecture
Yes dear,
A long time ago i stopped. However you need to manage in old videos.
Try to listen without earphone.
Why there is background music? Please remove it
Dear,
Now i can't remove..you have to adjust.
However as per suggestions in new videos i stop including background music.
@@simtech0598 actually the music is good, just became more loud
Hmm..it's now feeling of individual. However, i stopped adding background music.
unfortunatly i have to leave this video due to the background music, i think even if u upload it again with 0 views ull have more than 200 within half the time it took to get your 107 views. lemme know if u uploaded it again.
Dear,
Don't look for 100% accurate in everything. People study in street light also.
When i uploaded that video i don't even have noise cancellation mic. So to suppress the noise i added background music.
Dear, These all things given in Abaqus Documentation you can read from there. I just explained them with example.