Це відео не доступне.
Перепрошуємо.
LS-DYNA TUTORIAL 5: Blast Load on Circular Plate
Вставка
- Опубліковано 12 сер 2024
- Basic LS-Dyna Tutorial: A video on how to make a simulation of the blast of a steel plate.
Things covered in this tutorial:
How to use Prepost to mesh a circular shell part.
How to define material using Plastic_Kinematics with strain rate effect.
How to simulate explosives/blast with Load Blast Enhanced.
Don't forget to like/subscribe/share if you need more tutorials.
You are wonderful Engineer Topa, this is great work
Thanks, please share my video so more people can learn! :D
Hello sir, I like the way you explain,like each step of simulation, so a bigner can also understand it
Hi. Please follow my other tutorials starting from the first one.
thanks for posting this tutorial.
You're welcome! Please share my videos if you find them useful.
Thanks for the tutorial.
You're welcome!
Your tutorial are awesome
Thanks man.
Brother Ameen your tutorials are really great! Thank you so much for the effort :) Really! If i may request..do you think you could possibily get the time to do a thermo-mechanical simulation of hot-forming with cooling? :P Would be really helpful!!! Thanks again!
You are welcome bro. As I always say, my videos are tutorials for only the basics. I am working on another tutorial now for a problem for Fluid Structure Interactions. I am planning to do a simulation for thermo mechanical problem but again, it will be just basic one.
Good afternoon! I really like your lessons. And do you have any experience using or examples of the NVH (acoustics) unit. Is it possible to use LS-DYNA to evaluate the sound insulation of the car. Simulate a noise source and compare the noise in a car without a noise insulation part, and then with a part made of noise-absorbing material?
Yes, NHV analysis is possible with LS-DYNA.
Hey , thanks for this great tutorial . I am working with your tutorials day by day and it is really helpful. Also I wil be in contact with you for an article. I am working on it too. I have a question about this tutorial. I added air material *null and add *eos . In *part, I connect them. After analysis I didn't notice a change in history. Do you know where the problem is?
I took datas for air from this article: Structural response of laminated composite plates to blast load, F. Dolce et.al.
You are welcome. Please share my videos if you find them useful.
To successfully model the air, you can't use LOAD BLAST ENHANCED (LBE). This approach is based on empirical data of incident pressure curves. Meaning, you have the structure, and you apply load on it. That's all. There is no air or explosives here.
To explicitly model air, you can check out my tutorial: TNT Blast on Composite Column.
Looking forward for research collaboration with you. You can text me on Facebook or LinkedIn.
Very informative approach to LBE . Is there any tutorial available for ALE Method in Blast loading ?
Dear Kumar,
Yeah I am planning to make one after my paper publication comes out. Right now, I cannot share it yet. :)
@@AmeenTopa Thank you for your prompt reply
hello sir. thank you so much for the video. can u please do the same with RCC column subjected to blast loading? it'll be really helpful.
Hello, finally can you do the simulation of RCC column subjected to blast loading, I need the same, please help me
Hi there, you can check my video titled "Concrete and Wrecking Ball"
Thank you for your nice videos. Can you please show how to create a Cylindrical Constrain? There is no information about it on the web.
Hi. Please check out my blog post here:
lsdynauniverse.blogspot.com/2021/11/cylindrical-coordinate-systems.html
thank you Ameen for this great tutorrial. do you know how to co simulate ls dyna and matlab simulink ıf you do please make a turorrial
You are welcome. Sorry, this is totally new for me. I never knew this was possible. Haha!
@@AmeenTopa thak you anyway you are great
Hello sir... Can u explain how to get the crack pattern of concrete specimen under impact load
Hi, please check this:
ua-cam.com/video/Kzc5VFetBdE/v-deo.html
Can you please perform a vehicle crash test simulation? for frontal crash and occupant safety in LS-DYNA?
these types of work has been extensively done by NCAC and others. You can check their website. They have abundance of report and simulation models.
Hi Debarshi,
You may follow this video series
ua-cam.com/video/JPniTvhy8BE/v-deo.html
Hii, I am also working on blast mechanics. your video was helpful.
I am trying to simulate the same problem with ALE method.
can you help me in that?
Dear Vikram, my tutorials are meant only for basics of LS DYNA. What you are asking is a little bit advanced. You can check the book: LS DYNA for Beginners, it has a chapter regarding blast simulation with ALE.
Ameen Topa Sir, i tried but could not get this book.If you have this book,can you send it to aman.vikram@gmail.com.
i will be grateful.
Hi Vikram,
Unfortunately, I don't have a copy of the book. If you really want to learn, you need to invest some money in buying this book. It will really help in your LS-DYNA journey.
hi sir :
thanks for this video
please , is there any sufficient video to model steel section I section or H section by ls prepost ?
Let's say you want to model a beam with I section. The easy way is to use shell element. You make a rectangular plate, with length relatively high compared to height. Put the thickness of this part. Now you already have a beam with an I section. The height of the I section is equivalent to the height of the rectangular. And the width of the I section is equal to the thickness of the shell.
If you still want to use solid element. Follow the same steps. Make the plate, now create solid element by extruding those shell elements.
hi dear :
thanks for your reply :
I model it by solid element by three parts , how can i merge all parts to be one solid element ?
thanks in advance
You can use the Move or Copy command. With this command, you can change all elements that you select to one part ID as long as they are the same type (solid, shell, beam..etc)
Ameen, thanks for posting this tutorial. I'm struggling to get the Z deformation to be similar to yours despite following all the steps. Would you still have the .k file for this tutorial so I could compare to mine? Thanks
Dear Luckymilor, unfortunately, I don't have the file with me anymore. As you can see, I made the file from scratch, so I think if you double check you might have made some error here or there. You can email me your file and I will have a look in my free time.
@@AmeenTopa no worries. I actually discovered the error. It was in the material input. I have another question however: can you recommnend any material besides 'LS-DYNA for Beginners: An insight into Ls-Prepost and Ls-Dyna'? Somehow training materials for this program is so scarce despite how useful it is. I'm mostly interested in simulating car crashes(with respect to occupant safety) and explosions. Thanks again for uploading these vids. They're really useful!
You may refer to dynaexamples and dynamore for more information. You may refer to d3view blog by Suri Bala
@@AmeenTopa thank you
Hi @luckymilor, I am facing the same issue
How did you resolve it? What error in the Material?
hi sir,
is this type of material can be used for low velocity impact simulation on thermoplastic plate? cause i try run the simulation without defining the strain rate and the model did not fail. thank you in advance
First of all, you need to consider strain rate effects in impact problems to get better results. Material models which are recommended for plastics are MAT024, MAT124, and MAT198.
There's a webinar uploaded in UA-cam about this topic. Search: Modelling Plastics LS-DYNA
@@AmeenTopa thank you sir
Thanks for the sharing the knowledge. I have a question. In the Load_Blast_Enhanced card, we input "m" as the mass of the charge. However, in Load_Ssa (subsea analysis) card, there is "w" input as weight. As far as i know, w is in terms of Newton in the MKS units while mass is kg. If 1 kg of charge is used , in the Load_Ssa card, should i input 9.81 as newton or 1 as kg in the "w" input? I'm a bit confused, highly appreciate the help. Thanks in advance.
I have never used this card and validate it with other data.
Yes you are right, W is weight and N is the correct unit. And according to the manual, they mentioned the weight, not the mass.
You can try to put 9.81 and 1 then compare the results and see which one is closer to the reference data you have.
@@AmeenTopa thanks for the reply, i tried everything already but the results were not satisfying...
If you tried both 1 and 9.81 and it didn't work. It means the error is in somewhere else.
You are still young, you need to live at least 100 years to be able to try "everything" in the software 😆😆😆
@@AmeenTopa İ am trying to valide an article which already validated another article and by using this control card, i have made at least 500 parametric analyses :))) But i have nothing :) well, actually i have something, but the parameters in the articles are not telling the truth i suppose :)
Try to email the authors and if you are lucky they will reply
Sir, is there anything I need to set up to output a cloud map of concrete damage?
This depends on which material model you are using. You can check my tutorials where I used concrete material.
@@AmeenTopa ok sir
hi sir. thanks for this video. ı need to crack for run my program ls dyna4.1. Can uhelp me ?
Dear Ilyas, sorry as I only use the original version provided my university.
what we need to change and describe if the plate was solid element sir??
Use SECTION SOLID instead of SECTION SHELL And you need to create the mesh with solid elements. Check my tutorial on Three Point Bending of Sandwich Structure to see how to crease solid elements.
@@AmeenTopa my material is not deforming? any idea how to fix it sir? but it say its received the blasting effect
Make sure that you are not using MAT RIGID. And it could be that there is deformation but it is little so you cannot see it. Plot the stresses, if you have stresses then it means there is deformation.
@@AmeenTopa can i email you to send my k file about my problem sir?
@@abdullahfaqih9745 For personal consultation, you may contact my team at sites.google.com/view/topacademyofficial/home
Dear sir, binary_blstfor file is getting created but i cannot see my model in the file ( my model is purely ALE) please help me with this
There must be something wrong in how you defined the keyword. Please check the user Manual Vol. 1.
Thanks for replying sir, i just wanted to know whether we can use DATABASE_BLSTFOR for purely ALE model where I have modeled TNT by selecting elements (no load blast enhance is used). From one week I'm trying but still it is not working(model is showing D3PLOT perfectly )
I only want incident pressure which is available in firnge component option of BLSTFOR file.😑😑
@@akhillanka4279 DATABASE_BLSTFOR will not work for ALE method. You can refer to the discussions in LS-DYNA google groups for more details about your problem.
@@akhillanka4279 You can try DATABASE FSI. Also, DATABASE ALE SENSOR
dear sir how can i apply impulse load due to shock formation instead of blast
You can use ALE method. Check my tutorials on ALE.
I want to apply the pressure load for very short duration.
I am doing project, circular plate deformation using shock tube. It is case of high velocity forming. So I need to apply pressures for around 0.4 miliseconds .
@@Ya_baba_tajuddin As I mentioned, for shock tube simulations, you can use the ALE method.
If you have the pressure history data, then you can use LOAD SEGMENT SET.
@@AmeenTopa thanku so much sir you are doing very great work. It worked for me i tried with load segment. Some more things i have to ask, In Post processing
How can i plot deflection of plate along its diameter and how can i measure thickness of plate after deformation along its diameter i want to compare those results with my experimental data
I tried a lot but i am getting this specific error. what could be the reason??
*PART
*** Error reading *LOAD_BLAST_ENHANCED
--------------------------------------------------------------------------------
*** Error in keyword command:
CIRCLESHELL
At line# 41 of file
C:\Users\aksha\Documents\temp_model.k
*** Warning lines being skipped - See messag or d3hsp files
CHECKING SHELL ELEMENT DATA
*** Error Shell element with ID= 1
has an undefined PID= 1
*** Error input data failed with: 3 errors
E r r o r t e r m i n a t i o n
Please recheck your model. There is an error in the element.
Try to redo the meshing.
I did it twice ... What might be the problem
Because it says i have 3 problems
Ok. Try to follow the tutorial exactly, step by step. Do you still get the same errors?
Ji Ameen, How do define gravity? Gravity not included here
Dear Emon,
Yes, gravity is not defined in this example. How to define gravity is explained in my tutorial: Wrecking Ball and Reinforced Concrete
@@AmeenTopa Hi Ameen, looks likes: Wrecking Ball and Reinforced Concrete tutorials don't exist online, can you please put the link below
Here's the link: ua-cam.com/video/Kzc5VFetBdE/v-deo.html
Name: Reinforced Concrete and Wrecking Ball
@@AmeenTopa Thank you bud
Link to download LS-DYNA:
getintopc.com/softwares/simulators/ls-dyna-free-download/
Sir i requested in LinkedIn please accept my request I want to talk about charge for that topic video
I haven't received anything. You can try to contact us at: sites.google.com/view/topacademyofficial/about-topacademy?authuser=0