Пікірлер

• 
  @luizgustavodelimapreviero489514 күн бұрын

  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! =)

• 
  @atakhabaz360714 күн бұрын

  @@luizgustavodelimapreviero4895 happy to hear that. Thanks for your interest.

• 
  @abuzarjamil883618 күн бұрын

  Thank you, do you know how to model this using Ansys workbench. I am trying but unable to generate a damage and get a nonlinear response.

• 
  @adityaanand133318 күн бұрын

  Please upload full tutorial sir

• 
  @Ravi-ld5br29 күн бұрын

  could you please make a video on deformation and fracture mechanism of particle reinforced metal matrix composite with ductile damage model

• 
  @danielbc8870Ай бұрын

  nice video

• 
  @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

• 
  @AlisherAshirbekov4 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?

• 
  @atakhabaz36074 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.

• 
  @AlisherAshirbekov4 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?

• 
  @atakhabaz36074 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.

• 
  @AzamKhan-rq2wi4 ай бұрын

  Kindly upload tutorial for this DCB

• 
  @nurakelva31084 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

• 
  @atakhabaz36074 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.

• 
  @nurakelva31084 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?

• 
  @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.

• 
  @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

• 
  @amrmasoud55805 ай бұрын

  To check abaqus accuracy , it must be compared the abaqus results with experiental ones>>> did you that?

• 
  @atakhabaz36075 ай бұрын

  "This video has an educational aspect, but please note that it has not been validated or verified by authoritative sources."

• 
  @imendebbabi80715 ай бұрын

  Thanks a lot for this Job. can you please give us a tutorial for the DCB. I am very interested.

• 
  @atakhabaz36075 ай бұрын

  Thanks for your interest Imen. It's Ok. I'll go for that soon.

• 
  @hoomanmohammadian40276 ай бұрын

  excellent 👌👌👌

• 
  @atakhabaz36076 ай бұрын

  Thanks Dear Houman

• 
  @SamaDadgar-wo6rp6 ай бұрын

  Great 👌

• 
  @safaadjebbar40306 ай бұрын

  Wath is the solution of this problem plz

• 
  @atakhabaz36076 ай бұрын

  Dear Safa, sorry I couldn't get your point. Could you please ask your question more clear and/or with details.

• 
  @user-zo2no5tg2y6 ай бұрын

  Thanks my friend

• 
  @atakhabaz36076 ай бұрын

  Thanks Dear Amir. Thanks for your time, interest and support. 🙏☘️

• 
  @azhdarrahmani21036 ай бұрын

  Excellent, many thanks for your good lectures

• 
  @atakhabaz36076 ай бұрын

  Thanks Dear Dr Rahmani for your interest. 🙏🙏🙏

• 
  @user-yl9gp9go7m6 ай бұрын

  Thank you Mr.Khabaz

• 
  @atakhabaz36076 ай бұрын

  Thanks for your interest 🙏

• 
  @hoomanmohammadian40276 ай бұрын

  Good job

• 
  @atakhabaz36076 ай бұрын

  Thanks Houman.

• 
  @SamaDadgar-wo6rp6 ай бұрын

  👌👏

• 
  @amrmasoud55806 ай бұрын

  Hi Please tell me how to model cyclic loading for RC and show PINCHING effect in ABAQUS? Thanks

• 
  @atakhabaz36076 ай бұрын

  Thanks for your interest Dear Dr., In order to apply cyclic loading, it is preferable to apply the load using the amplitude, similar to what is done in the movie. However, to simulate the pinching effect, I believe it is necessary to write a subroutine. Within this subroutine, you can introduce a damage parameter D, which ranges from 0 to 1 and is a function of the time period. As the solution progresses and the time step increases, the elastic and plastic properties should be updated by multiplying them with this D parameter.

• 
  @amrmasoud55805 ай бұрын

  @@atakhabaz3607 Hi Thanks you , please have you another easy trick to consider pinching effect ? Thanks

• 
  @user-nr1qm8ie3h7 ай бұрын

  Why are symmetric boundary constraints applied instead of periodic boundary conditions? I feel that this approach is not reasonable. Do you have any references or justifications for this method?

• 
  @atakhabaz36077 ай бұрын

  Thanks for your comment but I think it's better to do the analysis by the BCs that you mentioned. If you model any kind of repeated cell including 1/4th, 1/2nd one or two or ... cells of fiber and matix as a representative, it should give you the same results, neglecting that it's periodic or not.

• 
  @user-nr1qm8ie3h7 ай бұрын

  Thank you for your reply. Do you understand how to add complete cellular periodic boundary conditions? In particular, how can the nodes at corners and edges be handled to prevent over-constraint? Thank you.@@atakhabaz3607

• 
  @Muzafar_KU7 ай бұрын

  Excellent. I am learning extensively from your videos. I have a request if you could please provide tutorial on the tensile, flexural and impact behaviour of fiber metal laminates. Thankyou Sir

• 
  @atakhabaz36077 ай бұрын

  Thanks Dear Muzafar. I just want to make videos of own interesting experiences. My main fields of study are related to mechanical point of view on adhesives, frps and polymer and solid materials interface. This video is also a fundamental and important study that can be used in such studies. All in all, i appreciate your comment and try to do my bests.

• 
  @YLAHDILI7 ай бұрын

  It is very educational, even for beginners like me! slowly going step by step on how to start from a blank sketch to plotting Young Modulus, amazing tutorial Dr Ata👏

• 
  @atakhabaz36077 ай бұрын

  Thanks a bunch Dear Youness for your time.

• 
  @SamaDadgar-wo6rp7 ай бұрын

  Excellent 👏

• 
  @atakhabaz36077 ай бұрын

  Thank you! Cheers!

• 
  @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

• 
  @imendebbabi80717 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.

• 
  @atakhabaz36077 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.

• 
  @atakhabaz36077 ай бұрын

  I mean Adhesive failure not cohesive.

• 
  @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

• 
  @muhammadjunaidali5298 ай бұрын

  You provide paid services for the any project and can you seepage analysis

• 
  @atakhabaz36078 ай бұрын

  Please provide me with your project. You can contact me via my Gmail. [email protected]

• 
  @user-fi2de3rf6p8 ай бұрын

  I sincerely appreciate your generous support. Thank you, Dr.

• 
  @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.

• 
  @user-fi2de3rf6p8 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?"

• 
  @atakhabaz36078 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.

• 
  @SamaDadgar-wo6rp8 ай бұрын

  Great 👍

• 
  @atakhabaz36078 ай бұрын

  Thanks for the visit

• 
  @MIZRAIM19848 ай бұрын

  Thank you!

• 
  @atakhabaz36078 ай бұрын

  Welcome!

• 
  @naderzamani57528 ай бұрын

  Dear Dr. Khabaz, in your APDL, there is a line *set, thick, 2 I am assuming that this plays no role, correct? Also, is there a reason that you chose "plane stress" as opposed to "plane stress with thickness"?

• 
  @atakhabaz36078 ай бұрын

  First, I would like to express my sincere gratitude for your interest in the video. Regarding your comment, I agree that this line is insignificant if the element is chosen to be in a plane stress condition. As you mentioned, opting for plane stress with thickness provides more precise and accurate results.

• 
  @AshkanJafari-ly2dk9 ай бұрын

  ❤️❤️❤️❤️

• 
  @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: [email protected]

• 
  @user-py8kp8fw9j9 ай бұрын

  ❤

• 
  @user-yl9gp9go7m9 ай бұрын

  great. thank you so much😍🥰

• 
  @atakhabaz36079 ай бұрын

  Thanks for your interest.

• 
  @naderzamani57529 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.

• 
  @atakhabaz36079 ай бұрын

  I really appreciate Dear Professor. I am waiting for it.

• 
  @user-is6hd7jc4x9 ай бұрын

  Thanks for sharing. I am waiting for the creep simulation part of the video.

• 
  @atakhabaz36079 ай бұрын

  Thanks for your interest

• 
  @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.

• 
  @imdadimmu874110 ай бұрын

  Very helpful video

• 
  @atakhabaz360710 ай бұрын

  Thanks

• 
  @hoomanmohammadian402711 ай бұрын

  Nice job

• 
  @atakhabaz360711 ай бұрын

  Thank you Hooman🙏

• 
  @behzadkhanaliloo235611 ай бұрын

  What's the wavelength span covered by this technique? Any reason why infrared is used?

• 
  @atakhabaz360711 ай бұрын

  Thank you for your comment! In Fourier Transform Infrared (FTIR) spectroscopy, the wavelength span typically covered is in the infrared region of the electromagnetic spectrum. The infrared region ranges from approximately 700 nanometers (nm) to 1 millimeter (mm) in wavelength. FTIR spectroscopy is specifically used in the infrared region because it allows us to study the vibrational and rotational modes of molecules. Different chemical bonds and functional groups exhibit characteristic absorption bands in the infrared region. By analyzing these absorption bands, we can gain valuable insights into the molecular composition, structure, and interactions of the substances under investigation. The infrared region is particularly useful for studying organic compounds, polymers, minerals, and many other materials. It provides a unique perspective on chemical bonds and molecular behavior, making it an essential tool in various scientific fields, including chemistry, materials science, pharmaceuticals, and environmental analysis. Even though this video specifically focuses on the normalization of the curves, I really appreciate your brilliant question for clarifying this issue. Thank you for your valuable input Dear Dr. Behzad!

• 
  @asghargholizadeh409611 ай бұрын

  Congratulations and good luck, Dr. Ata

• 
  @atakhabaz360711 ай бұрын

  Thanks a bunch Dear doctor Asghar. Warm welcome to you.

• 
  @user-py8kp8fw9j11 ай бұрын

  thank you doctor

• 
  @user-py8kp8fw9j11 ай бұрын

  thank you doctor

• 
  @user-li9ju9sb1q11 ай бұрын

  Thank you 👍

• 
  @user-py8kp8fw9j11 ай бұрын

  thank you doctor