Mr. Khabaz, I can't stress how thankfull I am for this tutorial, you basically saved my scientific initiation research on FEA! Have an excellent everything! =)
@atakhabaz3607Ай бұрын
@@luizgustavodelimapreviero4895 happy to hear that. Thanks for your interest.
@user-fi2de3rf6p8 ай бұрын
I sincerely appreciate your generous support. Thank you, Dr.
@asghargholizadeh409611 ай бұрын
Congratulations and good luck, Dr. Ata
@atakhabaz360711 ай бұрын
Thanks a bunch Dear doctor Asghar. Warm welcome to you.
@behzadkhanaliloo235611 ай бұрын
Thank you for making such a great content!
@user-py8kp8fw9j11 ай бұрын
thank you doctor
@naderzamani575210 ай бұрын
Nice video Dr. Khabaz. In the near future, I will try to make a clip which retraces you steps in the 3DEXPERIENCE platform with Simulia/Abaqus as the solver. Hopefully, it has all the needed features.
@atakhabaz360710 ай бұрын
I really appreciate Dear Professor. I am waiting for it.
@user-gw2jo4lt9o11 ай бұрын
Thanks for sharing
@atakhabaz360711 ай бұрын
Thanks for your interest.
@user-is6hd7jc4x11 ай бұрын
Everything you said is true
@atakhabaz360711 ай бұрын
As I said in the video, this is the simplest method that only needs stress-stress curve of the adhesive layer. However, if you need to obtain more accurate result you have to do some other tests like DCB or ENF to get fracture energies on modes I and II, respectively.
@azad329011 ай бұрын
Wish u the best Dear Doc
@atakhabaz360711 ай бұрын
Thanks a lot
@user-li9ju9sb1q11 ай бұрын
Thank you 👍
@danielbc8870Ай бұрын
nice video
@user-fi2de3rf6p9 ай бұрын
"Hi, Dr. How are you doing? I wanted to thank you very much for your tutoring; it has provided me with great support for my research. If you don't mind, could you please give us a hint about shear stress and peel stress distribution?"
@atakhabaz36079 ай бұрын
Thank you for your interest. I apologize if I didn't fully understand your question. From what I gather, you're asking about the relationship between stress, overlap length (X axis), and shear stress in a joint. In this context, we can consider the stress acting along the overlap length as shear stress, while the stress acting perpendicular to it (along the Y axis) can be considered as peel stress. It's important to note that this type of joint experiences both shear and peel stresses, with shear stress being the dominant factor. To further explore the effects of peel stress, you can simulate other joint geometries, such as a butt joint. This will allow you to observe and analyze the peeling effects more prominently and understand how they influence the joint behavior.
@imendebbabi80718 ай бұрын
Thank you for the video it is so helpful. Please can you explain how to have travtion separation parameetrs in the case of belinear czm model. Thank's in advance
@rezarazin804411 ай бұрын
، excellent job
@atakhabaz360711 ай бұрын
Many thanks!
@souravdas4456Ай бұрын
Hello, What is the field variable that shows the nominal stress in the CZ material? I am trying to check if the CZ in my model follows Traction Separation law
@user-yl9gp9go7m9 ай бұрын
great. thank you so much😍🥰
@atakhabaz36079 ай бұрын
Thanks for your interest.
@alaamohammed734611 ай бұрын
great content❤
@atakhabaz360711 ай бұрын
Thanks a lot Dear Alaa
@user-fi2de3rf6p8 ай бұрын
Okay, thanks, Doctor. To specifically note what I mean, how can we obtain the shear stress and peel stress distribution along the bond line over the overlap length? Which output tool in Abaqus is responsible for displaying the peel and shear stress? From what I've tried, 'S22' seems to represent peel stress, but I'm uncertain about the shear stress-whether it's represented by 'S11' or 'S12'. I know 'S33' is for mode 3 or out-of-plane stress. Again, I really want to thank you for your generous support.
@atakhabaz36078 ай бұрын
Thank you for your insightful question. As you mentioned, in this case, S22 represents the peel stress. When it comes to shear stress, we cannot consider any Sii stress form as shear stress. Sii always represents the perpendicular stress in the ith axis. Shear stress always requires two individual axes to determine it properly. One axis indicates the applied plane, and the other indicates the stress direction. Therefore, in this 2D problem, S12 is the shear stress, not S11.
@user-fi2de3rf6p8 ай бұрын
I sincerely appreciate your generous support. Thank you, Dr.
@behzadteimouri641911 ай бұрын
👍👍👍
@alihancambaz315910 ай бұрын
Hi ata , Can you share such videos for other plotting options like shear and peel stress. thank you
@atakhabaz360710 ай бұрын
Any individual model has its own condition but sure I will.
@nurakelva31085 ай бұрын
Where did you get nu value from the G_t-s? or is it constant?
@atakhabaz36075 ай бұрын
Nu is considered to be an elastic property. It's not an highly effective parameter. If you don't know the exact amount you can consider it among 0.3 to 0.4 for adhesive layer.
@nurakelva31085 ай бұрын
so we use the tensile test of the epoxy, specifically stress strain curve and compare with the lap shear test results: load disp? because my tensile test results do not look like in the video and when im comparing them with lap shear test load-disp results, they are too big
@atakhabaz36075 ай бұрын
In this case, the adhesive shows a ductile behavior and this approach can predict final load very well. It should be useful in brittle adhesives as well. The main condition here is that you have got a cohesive failure in the bond line not an adhesive failure.
@nurakelva31085 ай бұрын
@@atakhabaz3607 i had 99% of damage, should i play around with G values? because im getting too big values for load and disp also can i contact you for more help?
@safaadjebbar40307 ай бұрын
Wath is the solution of this problem plz
@atakhabaz36077 ай бұрын
Dear Safa, sorry I couldn't get your point. Could you please ask your question more clear and/or with details.
@AlisherAshirbekov5 ай бұрын
Good evening sir, thank for the video. When i trying to simulate slj test with cohesive element as interface layer, at the end of analysis cohesive elements distorted and haven't been deleted. Can you please tell me what is the possible reason of that?
@atakhabaz36075 ай бұрын
In some cases element deletation doesn't work. However, you can check SDEG(the damage parameter) in your contour results and you can consider damage for elements with SDEG more than 0.98.
@AlisherAshirbekov5 ай бұрын
@@atakhabaz3607 so if I specify the max degradation equal to 0.98 in my mesh control, so the distorted element could be deleted?
@atakhabaz36075 ай бұрын
@@AlisherAshirbekov the thing that you mentioned is something else. It's the input value for your simulation that indicates the deletation should start when D is 0.98. However, sometimes Abaqus doesn't show the elements deletation. In those cases, you would better to check D parameter from you counter results. And consider If the damage parameter D exceeds 0.98 for specific elements, you can consider those elements to have failed. You can check the D parameter using SDEG.
@imendebbabi80719 ай бұрын
great Job Sir, Can you please send me your paper "Creep behaviour of a graphene-reinforced epoxy adhesively bonded joint: experimental and numerical investigation" i am so interested on it.
@atakhabaz36079 ай бұрын
Thanks for your interest. Sure. Just send an email to: khabaz65@gmail.com
@mono78915 ай бұрын
Hello Dr. Ata, I followed your instruction, but my simulation does not run..... It is giving me "CRITICAL FRACTURE ENERGY IS SMALLER THAN THE ELASTIC ENERGY PRIOR TO DAMAGE INITIATION" My stress-strain curve is of triangular. So I multiplied the strain with thickness of the adhesive element to get stress-displacement curve. Now, when I take the area, it is coming about 2.0 N/mm. When I fed this in my simulation, it is not running. So I tried to decrease the energy (trial & error). So it runs. there must be wrong with my model. Please tell me what mistake I am doing? Than you for your help.
@atakhabaz36075 ай бұрын
Hi MONO, Since I don't have detailed information about your simulation, I can only guess some probable mistakes. Please check the following: 1. You need to change either the initial stiffness or the Young's modulus in the normal and shear modes. 2. You are not allowed to mesh the bonded line with more than one element in the thickness direction. 3. You are not allowed to change the maximum traction because this parameter is more important than the G value. 4. Maybe you have experienced adhesive failure in your experiments. If so, the interface region is weaker than the adhesive layer itself, which introduces an error in your simulation.
@mono78915 ай бұрын
@@atakhabaz3607 Thank you, Dr. Ata. I recalculated Young's modulus, my mesh is alos one element thick, Rest I have left all the default value. We simulate two conditions, one at room temperature and second at higer temperature. So now, my simulation runs, the cohesive elements starts to vanish, but then it stops with an error ..."THE SOLUTION APPEARS TO BE DIVERGING. CONVERGENCE IS JUDGED UNLIKELY." Thank you once again. Regards
@user-gw2jo4lt9o11 ай бұрын
Thanks for sharing
@imendebbabi80718 ай бұрын
Thank you for the video it is so helpful. Please can you explain how to have travtion separation parameetrs in the case of belinear czm model. Thank's in advance
@atakhabaz36078 ай бұрын
Thank you for your interest. Actually here we also used the triangular or bilinear CZM. this triangular damage model indicates using 3 individual parameters of 1. initial slop (or elastic Props), 2. the maximum amount of traction (Sy), and 3. the area under the triangle traction-separation diagram (Energy at failure).
@imendebbabi80718 ай бұрын
@@atakhabaz3607 then I Can do thé same to get parameetrs. Thank you so much
@imendebbabi80718 ай бұрын
@@atakhabaz3607 Hi I am working on DCB test , I made all steps but when I compare the RF at the reference point I find thant FEM force is so high compared with experimental force. I don't find the source of problem, Do you have any idea please.
@atakhabaz36078 ай бұрын
@@imendebbabi8071 I think you have got the science border. But according to my experience it can be due to some reasons. 1. You maybe use a brittle adhesive in experiment. (If you use Araldite2011,then it was cured in room temperature maybe). 2. The domenant fracture area in DCB test is adhesive.