- Видео 10
- Просмотров 38 805
Ata Khabaz
Добавлен 30 окт 2011
Double cantilever beam (DCB)
Damage simulation of double cantilever beam (DCB) specimens using cohesive zone modeling (CZM) method
Просмотров: 219
Видео
Mastering ENF Testing: Abaqus Tutorial for Simulating ENF Tests using CZM Analysis
Просмотров 1,2 тыс.9 месяцев назад
Welcome to my channel, where I bring you the ultimate guide to mastering the simulation of End Notch Flexure (ENF) tests using CZM analysis in Abaqus. In this step-by-step tutorial, I will take you through the entire process of setting up and analyzing ENF tests, providing you with the knowledge and skills needed to become an expert in this field. Whether you're a student, researcher, or profes...
ABAQUS Finite Element Tutorial: Analyzing Orthotropic Properties of Fiber-Reinforced Composite
Просмотров 1,5 тыс.10 месяцев назад
Welcome to my RUclips channel! In this video, I will guide you through the fascinating world of finite element simulation using ABAQUS. Today's example focuses on a fundamental composite problem, where we aim to determine the elastic properties of a fiber-reinforced composite structure. This knowledge can be applied not only to fiber-reinforced materials but also to similar structures like rein...
Dramatic Earthquake Simulation Using ABAQUS
Просмотров 1,4 тыс.11 месяцев назад
Time and acceleration of Quebec Earthquake-2005 has been obtained from this website: forums.autodesk.com/t5/robot-structural-analysis-forum/how-to-import-an-earthquake-ground-motion-acceleration-data-into/td-p/7336059
Creep simulation in ANSYS. APDL Scripting.
Просмотров 69611 месяцев назад
This is how you can simply simulate creep phenomenon in ANSYS. The following APDL code is also helps you to manipulate it to your own model: finish /clear /PREP7 !* ET,1,PLANE182 !ET,1,PLANE183 ! 183 without keyoption !* KEYOPT,1,1,1 !!!! K1=0:full integration /// & K1=1: reduced integration KEYOPT,1,3,0 !!!! (K3=)0:Plane Stress !!!! 1: Plane Stress with thickness !!!! 2:Plane Strain KEYOPT,1,6...
Creep model using MATLAB Curve fitter APP
Просмотров 376Год назад
Norton-Baily or the power law model fits very well on polymers especially in high constant loads of creep test. In this video you will learn how to calculate the creep constants of an epoxy adhesive using experimental creep data and "Curve Fitter APP" of MATLAB software. In the second part of this video (publishes soon), the creep simulation of an adhesive joint is thought using ANSYS.
Simplified FTIR Spectra Normalization: Exploring Nano Silica, Epoxy, and Epoxy Nano Silica
Просмотров 1,5 тыс.Год назад
🔬 Learn the Basics of FTIR Spectra Normalization! 🌟 🔍 In this video, we focus on Nano Silica, Epoxy, and Epoxy Nano Silica as examples to illustrate the power of FTIR spectroscopy. 🌐 🔬 This video takes you through the step-by-step process of FTIR spectra normalization, making it easy to understand and apply. 💡 💥 Discover the importance of normalization in FTIR spectroscopy and how it enhances t...
Mastering CZM Damage Simulation in ABAQUS: Step-by-Step Tutorial for Adhesive Joints
Просмотров 9 тыс.Год назад
Welcome to my RUclips tutorial! In this video, you'll discover how to effectively simulate damage phenomena in a single lap joint (SLJ) using cohesive elements or cohesive zone modeling (CZM) within ABAQUS. This method offers a straightforward approach to replicate the load-displacement behavior of an SLJ specimen by utilizing only the stress-strain curve of the adhesive. By the end of this tut...
Abaqus Tutorial: Contact Analysis
Просмотров 8206 лет назад
In this video you learn how to simulate a contact problem in abaqus. this lecture is in Persian but it can be useful even for others.
Hi, we do not need to define the interaction between the adhesive joint and a substrate? like tie constraint?
@@noamaanshaikh5702 İ think you meant the interaction between the adhesive layer and the substrate. İf it is your question, i should answer it is not necessary in this model, because we didn't model the adhesive layer and the substrate separate from each other. Thismodel is only one part.
@@noamaanshaikh5702 as i remember you are not allowed to use tie or any other BCs for traction separation czm element. Check it.
Thanks for the video. Can you please help to model the SLJ using explicit package since I need to understand the damage on the adhesive. Thank you
Hello sir! Thank for the brief explanation for the Spectra Normalization. Can I also use this method when comparing 4 similar samples? a ratio of intensity is required by our professor
Yes, you can but be careful about the reasonablity of the chemical reactions.
Do you know any company can provide this solution.
No I don't.
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! =)
@@luizgustavodelimapreviero4895 happy to hear that. Thanks for your interest.
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.
Please upload full tutorial sir
could you please make a video on deformation and fracture mechanism of particle reinforced metal matrix composite with ductile damage model
nice video
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
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?
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.
@@atakhabaz3607 so if I specify the max degradation equal to 0.98 in my mesh control, so the distorted element could be deleted?
@@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.
Kindly upload tutorial for this DCB
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
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.
@@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?
Where did you get nu value from the G_t-s? or is it constant?
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.
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.
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.
@@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
To check abaqus accuracy , it must be compared the abaqus results with experiental ones>>> did you that?
"This video has an educational aspect, but please note that it has not been validated or verified by authoritative sources."
Thanks a lot for this Job. can you please give us a tutorial for the DCB. I am very interested.
Thanks for your interest Imen. It's Ok. I'll go for that soon.
excellent 👌👌👌
Thanks Dear Houman
Great 👌
Wath is the solution of this problem plz
Dear Safa, sorry I couldn't get your point. Could you please ask your question more clear and/or with details.
Thanks my friend
Thanks Dear Amir. Thanks for your time, interest and support. 🙏☘️
Excellent, many thanks for your good lectures
Thanks Dear Dr Rahmani for your interest. 🙏🙏🙏
Thank you Mr.Khabaz
Thanks for your interest 🙏
Good job
Thanks Houman.
👌👏
Hi Please tell me how to model cyclic loading for RC and show PINCHING effect in ABAQUS? Thanks
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.
@@atakhabaz3607 Hi Thanks you , please have you another easy trick to consider pinching effect ? Thanks
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?
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.
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
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
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.
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👏
Thanks a bunch Dear Youness for your time.
Excellent 👏
Thank you! Cheers!
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
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).
@@atakhabaz3607 then I Can do thé same to get parameetrs. Thank you so much
@@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.
@@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.
I mean Adhesive failure not cohesive.
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
You provide paid services for the any project and can you seepage analysis
Please provide me with your project. You can contact me via my Gmail. khabaz65@gmail.com
I sincerely appreciate your generous support. Thank you, Dr.
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.
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.
I sincerely appreciate your generous support. Thank you, Dr.
"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?"
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.
Great 👍
Thanks for the visit
Thank you!
Welcome!
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"?
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.
❤️❤️❤️❤️
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.
Thanks for your interest. Sure. Just send an email to: khabaz65@gmail.com
❤
great. thank you so much😍🥰
Thanks for your interest.
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.
I really appreciate Dear Professor. I am waiting for it.
Thanks for sharing. I am waiting for the creep simulation part of the video.
Thanks for your interest
Hi ata , Can you share such videos for other plotting options like shear and peel stress. thank you
Any individual model has its own condition but sure I will.
Very helpful video
Thanks
Nice job
Thank you Hooman🙏
What's the wavelength span covered by this technique? Any reason why infrared is used?
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!
Congratulations and good luck, Dr. Ata
Thanks a bunch Dear doctor Asghar. Warm welcome to you.