Thank you so much! Using your method I made the research of blast impacting bollards and building facades. Great work. I really appreciate it!

@AmeenTopa

4 жыл бұрын

You are most welcome! Don't forget to mention my name in the acknowledgement section 😁😁😁

@AmeenTopa

4 жыл бұрын

Also please share my videos and channel, help my channel grow (more followers) so I can make more good quality videos!

@roma1qwerty

4 жыл бұрын

@@AmeenTopa Yes, I will do it! Waiting for other videos. Also it will be great, if you make a video of how to create a proper foundation in LS-DYNA.

Thanks...ur vdos are mostly useful and easy to practice fr beginers

@AmeenTopa

4 жыл бұрын

Thanks a lot! make sure to like and share my videos so more can benefit!

you are an education angel :) thanks for everything.

@AmeenTopa

5 жыл бұрын

You are welcome

Nice one brother.

Excellent work, please keep this up!

@beoptimistic5853

3 жыл бұрын

https: //kzread.info/dash/bejne/eYd6utaBmZXLepc.html👍👍👍👍👍👍👍👍👍👍👍👍👍💐

@AmeenTopa

3 жыл бұрын

thanks, please share my videos so more people can learn and benefit! :)

Thank you! Great!

@AmeenTopa

4 ай бұрын

You are welcome. If you are doing research and benefited from this tutorial, please consider citing my article which is given in the video description.

Thankyou Sir. You are a lifesaver. Please make a video on nuclear blast load on a concrete wall.

Hello Sir! Your videos are extremely informative and simple to understand. Thank you so much as always! Could you please make a video on simulating rock blasting using LS Dyna and also measurement of ground vibrations generated as the result of the blasting performed.

@AmeenTopa

Жыл бұрын

I already have a series of videos on this topic. You can search in my channel.

Thank you very much for excellent tutorial to understand the usage of curve and table keyword as well as blast load. if you provide a tutorial for Johnson cook material model with the above strain rate effect. it will be very useful to the lsdyna beginners like me....

@AmeenTopa

5 жыл бұрын

I consider Johnson cook a bit advanced and I would like to keep my tutorials very simple. But, I will keep you comment in mind and maybe in following tutorials will be included.

@selvamraj11

5 жыл бұрын

I would like to learn the basics as well as advances in CAE, Please give me test mail to my mail id selvamraj1@gmail.com

Dear Mr. Topa, thank you for your excellent tutorials for LS DYNA. This one is very useful for me, but I have a question related to the shape of the charge. In your video, you only define the distance of the center of the charge, assuming it was cylindrical. Is there a way to model the shape of the charge since the pressures and impulses around the charge strongly depend on the shape?

@AmeenTopa

4 жыл бұрын

To model the initial shape of the charge, you need to use ALE method.

@damirvarevac8364

4 жыл бұрын

@@AmeenTopa Thanks! Any suggestion about where to look for instructions?

Hi Ameen, may I ask what is your software and hardware configuration that you use for making your videos? For example, which software do you use to record your videos?

@AmeenTopa

3 жыл бұрын

I use CAMTASIA software to record my videos. I use Windows 10, Intel (R) Core(TM) i57300HQ CPU with 12.0 GB

Hi Ameen, Thanks for your sharing. Anyways, I have some questions related to this: 1. if the top plate and the core is connected by welding, is it enough by using the same nodes for the connected surface of elements or do we need to define contact surface? 2. if the load is a pressure-time history on the top plate, is it correct if I define segment set (SSID)of the top plate and curve of pressure-time (LCID) and then used it in *LOAD_SEGMENT_SET. I am new to LS-Prepost, hope you don't mind if my questions don't make any senses. Thank again for your sharing and looking forward for your help.

@AmeenTopa

3 жыл бұрын

Dear Lam, 1 - For connection, you can merge the duplicate the nodes which is the easier option. For more advanced modelling, you can use Contacts Tiebreak. 2 - Yes, you can use that approach too. But using Load Blast Enhanced is more accurate because the load varies depends on the incident angle, and this is not possible with Load Segment Set. Sincerely,

@lalinlamCambodia

3 жыл бұрын

Ameen Topa thanks for your response. I have one more question related to my question 2. We use *LOAD_SEGMENT_SET when the load is a pressure-time curve and *LOAD_NODE_SET when the load is a force-time curve, am I right? And for DEFINE_CURVE, we can use for both pressure or force-time history right? Or are there any other ways? Thanks.

@AmeenTopa

3 жыл бұрын

@@lalinlamCambodia Yes, define curve for both, pressure vs time and force vs time curves.

Hi sir, While giving the termination time you have to give in seconds right because in blast enhanced card the units are in kg,m, sec, newton. Please clarify ??

@AmeenTopa

5 жыл бұрын

Yes. I am using seconds. And from the unit of length, mass, and stress you can know this also. www.dynasupport.com/howtos/general/consistent-units

In Blast loading validation of RCC slab, I am defining everything, the unit is in g, mm, ms and MPa in blast load and In MAT I am not defining the unit but all input in LS PRE POST IS according to blast loading unit also the software gives result but the deflection result very small compared to the experiment can you help me? in which definition I missing?

@AmeenTopa

4 жыл бұрын

How much small is it? You can try blast on steel plate or plain concrete slab to check if your units are correct. If this give good results, then it means the problem with how you model the RCC slab.

Like! I did not catch, does this method simulate the action of explosion products? If the charge is located close, then the products of the explosion have a significant effect along with the shock wave.

@AmeenTopa

3 жыл бұрын

It depends on the scaled distance. Load blast enhanced is derived from empirical data and it is not suitable for very small values of scaled distance. For close distance detonations, you need to model the explosive explicitly. Check out my tutorial on TNT Blast on Composite Beam.

@VGYell

3 жыл бұрын

@@AmeenTopa Thanks! And I'm just trying to figure out the PARTICAL_BLAST method. I understand that it's the most suitable for this.

@AmeenTopa

3 жыл бұрын

It depends on the application and situation. There is no method that is 'best' for everything. If you are interested in blast with SPH, check out this video here (don't forget to read the video description) kzread.info/dash/bejne/ip2Y1JKpZqjWnLQ.html

Dear Sir, thank you for the tutorial. I am trying to simulate a storage tank with 100m diameter and 22.5m height under 1500kg TNT blast load based on a paper, so I followed the steps in this video and replaced the plate with a cylinder shell. However, during the solving process, warning messages of "number of blast segment normals pointing away from blast origin = 2570" showed up, and my initial kinetic energy is zero. Can you kindly guide me on this issue? Thank you very much.

@jiahaolo219

4 жыл бұрын

My email is lojiahao@hotmail.co.uk if sir wished to contact me through email.

@AmeenTopa

4 жыл бұрын

Dear Jia, please check your inbox. I cannot tell if I don't know more details. You can try to reverse the normals of the segments.

Good job, are you consider fragmentation ? Thanks

@AmeenTopa

10 ай бұрын

Failure strain was not defined and thus fragmentation was not considered in this model. This is because the damage was not that severe according to the experimental reference.

Hi Ameen: Is there way to provide cylinder change radius in LS DYNA? I can see you are simulating cylinder as sphere, right?

@AmeenTopa

2 жыл бұрын

You mean cylindrical charge, not change, right? If you want to simulate the shape of the TNT, you must use another method such as ALE or SPH. Check my tutorial TNT Blast on Composite Beam

@EmonKhan-wx1rj

2 жыл бұрын

@@AmeenTopa you are right, Thank you

Dear Ameen, I also ran the same case, acceleration is very high (unexpected), kindly check your resultant or z acceleration for this simulation. Apart from this, I have tried sandwich foam panel using "crushable foam" as a core and "Steel plate" as a face sheets, the resultant acceleration is upto 10^6-10^5 m/s^2 which is unexpected while displacement is showing satisfactory results. Can you explain this error.

@AmeenTopa

4 жыл бұрын

Dear Patil, what do you mean by very high acceleration? This is blast simulation and acceleration is expected to be high. Good agreement is found when comparing the displacement with test data. Thus it is validated. It is very impractical to measure acceleration in experiment. May I know on what basis you say the acceleration is very high?

@vaibhavnmete

4 жыл бұрын

@@AmeenTopa Ya agree, you are correct with the test result. But measured acceleration is very high, have you seen acceleration in powers like 3.06 x 10^6 m/s^2 ??? My purpose is to measure resultant acceleration on the panel.

@AmeenTopa

4 жыл бұрын

Dear Patil, we are talking about explosives here, right? I don't think it is fair to compare this case of high intensity load (which can deflect a 12 mm thick steel plate) to the case when the target is human body. 1 kg of TNT blasted from a distance of 10 cm, that's crazy amount of force which will shatter human flash into pieces.

Its great tutorial sir, i wonder to know how to simulate the slope stability (geotechnical for soil and rock mechanics) under blast load (stability of slope affectef by mining blasting activity)? Realy apreciate your help sir..

@AmeenTopa

2 жыл бұрын

You can check my other tutorials about blast loads.

@ruztdaloccozz

2 жыл бұрын

@@AmeenTopa where can i check sir? I searched in your youtube chanel its nothing about slope stability under blasting load..

Dear Mr. Topa, I followed your steps on this video precisely only changing the TNT mass to 5kg, it runs smoothly however when I try to plot the Z-displacement graph it showed me just the graph but not any numbers. Can you tell me what's wrong? Thank you

@AmeenTopa

2 жыл бұрын

This is just a visualization matter. You need to change the colour of the font or colour or background. You can do it from the setting tabs on the top left of the Prepost window.

@99geraldy

2 жыл бұрын

@@AmeenTopa The problem is solved, thank you very much. God bless you!

Anyway of obtaining blast reflected pressure from LS-DYNA?

@AmeenTopa

2 жыл бұрын

Yes. You can use DATABASE BINARY BLSTFOR

Super useful video Ameen. Thank you so much. However, as you spent quite some time defining the strain rate of the material at the beginning of the video, you did not clarify the effects of the strain rate on the results. Thanks again for your useful videos.

@AmeenTopa

4 ай бұрын

You may try the simulation without considering the strain rate effects and see the difference in the results yourself. 😁

@haidermraih2559

4 ай бұрын

Completely agree @@AmeenTopa, but I have one question regarding the strain rate effect, did you use the full stress-strain curve from the beginning of the test or did you choose the data beyond the yield stress?

@AmeenTopa

4 ай бұрын

@@haidermraih2559 for MAT024, we only use the stress data after the yield point. Check this video for a comprehensive explanation about this model: kzread.info/dash/bejne/fGmFzMyYabbVpJM.htmlsi=ovFSlVW0ZyWy1zYG

Am getting deflection of plate in same direction of blast load instead of opposite.

@AmeenTopa

3 жыл бұрын

Check the normal location of the detonation point.

can you make the tutorial on blast loading by sph techinique i need it

@AmeenTopa

5 жыл бұрын

have you seen my SPH tutorial? Bird strike simulation.

@Nick-gj9my

5 жыл бұрын

@@AmeenTopa yes...but that was of impact..how to relate that with blast

@AmeenTopa

5 жыл бұрын

@@Nick-gj9my Please check the following paper: www.dynamore.de/de/download/papers/2012-internationale-ls-dyna-users-conference/documents/blast-impact06-a.pdf

Hello, sir. Would you please make a video about the explosion of reinforced concrete? If so, I would be grateful

@AmeenTopa

Жыл бұрын

Sorry, I don't have the time to make any video requests. You can learn how to create blast load from this video. Search on my channel and you will see videos on how to model concrete slab. Combine the steps from both videos and you will get what you want. With that being said, if you are interested in private consultation session, you can contact my team.

@shiqizhang3532

Жыл бұрын

@@AmeenTopa Well, sir, I'm very lucky to meet your video in this world

@AmeenTopa

Жыл бұрын

@@shiqizhang3532 Please share my videos so more people will learn from it!

@shiqizhang3532

Жыл бұрын

@@AmeenTopa i will it's wonderful!

Hello sir, can you do a blast simulation in confined space

@AmeenTopa

Жыл бұрын

For blast in confined space, there will be reflections on the wall. So, you must use ALE method. Check my tutorial on TNT Blast on Composite Beam.

Can you please share the Excel sheet of stress-strain values for steel?

@AmeenTopa

11 ай бұрын

Please check the link in the video description.

Can we have manual proportions of materials on this software? Please help Like 40% and 20%

@AmeenTopa

2 жыл бұрын

Sorry I don't get what you mean.

@jaqenhghar3788

2 жыл бұрын

@@AmeenTopa I mean I have to make a structure of 3 materials in proportion of 40,30 and 30 is it possible to do that? Polypropylene,mica and rubber in diff proportions in 1 structure

@AmeenTopa

2 жыл бұрын

Yes. It is all about the material properties. You need use simple shell or solid elements but you need advanced material model to allow for the anisotropic behavior of the material.

There are errors showing in the file after rechecking the model, they are regarding "load curves are not monotonically increasing, curve 5 is not reaching the same strain value as compared to others", etc. Which result in error termination instead of normal termination. Sir, could you suggest me how to overcome this?

@AmeenTopa

4 жыл бұрын

It might be an mistake in defining the curve or in the solver (your software is very old version) To be honest, I have never faced the error you've mentioned above.

@vaibhavnmete

4 жыл бұрын

@@AmeenTopa Sir, While rechecking my keywords, this message pops up and I have chosen solid brick elements instead of shell. I recommend, please check your model, too.

@AmeenTopa

4 жыл бұрын

@@vaibhavnmete Thank you for your notifiaction

@harshadasharma9632

4 жыл бұрын

@@AmeenTopa can you please provide your email id on sanj_2sure@yahoo.com or sanjeev222175@gmail.com

Please send me the download link of ls-dyna full , thanks

@AmeenTopa

5 жыл бұрын

Contact the provider of your region to get the license of LS DYNA. You can find more info in their website: www.lstc.com

@zurameen

3 жыл бұрын

Link to download LS-DYNA: getintopc.com/softwares/simulators/ls-dyna-free-download/

hi ammen, could you please help me in the explicit analysis of high speed impact? can i get your mail id?

@AmeenTopa

5 жыл бұрын

Write your email here and I will contact you.

bro, the google drive link isn't working

@AmeenTopa

4 жыл бұрын

I will try to fix it. For the time being, try this video. kzread.info/dash/bejne/dGWqqbSOYsSblpM.html

@AmeenTopa

4 жыл бұрын

Yo tough guy, I fixed the link. Here you go, please don't beat me up 😝😝 drive.google.com/drive/mobile/folders/1i8Upn-Sa4K0I9Zjq-qEClwHahP-dFrbl?usp=drive_open

@zurameen

3 жыл бұрын

Link to download LS-DYNA: getintopc.com/softwares/simulators/ls-dyna-free-download/

Link to download LS-DYNA: getintopc.com/softwares/simulators/ls-dyna-free-download/