Hi , I saw your post on Linkedin. there are some corrections I would like to point out in your analysis nevertheless a good approach really appreciate it. Dont mind me correcting you , the model used by you is not a chassis its looks like an A surface of a hypercar usually called as Body side outer, and unless you have a proper material curve you cannot calculate Heat dissipated during the crash by using MAT18 As Mat 18 uses elasto plastic behaviour of the material which obeys Cowper symonds law and looks into isotropic hardening . You need to use Jhonson cook material model which has temperature factor if you want to calculate the heat dissipation during high speed impacts.
Hello Anoop, I really appreciate you pointing out this flaw. I will consider this correction from next time. Thank you for taking the time to convey this useful information. PS : If possible, can you share your email id or contact me through the 'About' page of this channel ? I would like to discuss more about this with you.
It is an awesome type of explanation about the frontal crash, with all the necessity boundary conditions and control cards.it helped me a lot . Can you please let me know the Zero millisecond run procedure with all control cards for the same modal, which is the previous step of this crash simulation. Plzzzz
Can anyone tell how come the value of K (strength coefficient) (3:10) is 0.097 ? Wherever I have searched the value of K for aluminium lies between 180 - 400 MPa..
Thanks for this great video. I have a quick question. In contact creation, don't we need to create a self-contact for the chassis itself to avoid any penetration during the impact occurring? In your other video of this chassis, you did self-contacting by selecting chassis as master and slave at the same time, but here you did not do so.!
very good video, pls give us this question tutorials video. all setting of dynamic tube crush test - d=50mm t=3mm l=180mm v=10.7m/s impactor mass 91kg in ls-prepost.
Thank you so much for this , Keep up the good work . Can you please upload a video for analysis of an assembly for eg. a balsa wing with carbon fibre reinforcement or something that involves more than one part. Im not really confident doing analysis for assemblies
Hello, I have explained the basics of viewing crash results in Hyperview at the end of this video. I will also be posting a video focused on postprocessing using Hyperview.
One thing I need to get cleared is, Can we give SPC boundary connection for a MAT20 component. Wouldn't it will through over constrained error? its like rigidizing an already rigid componenet
Hello, Good question. I think that applying SPC to a component with MAT20 will not result in any error. SPC is essentially a location constraint, it does not make a component rigid (just holds the selected nodes in place). On the other hand, a rigid material will actually make the component rigid. This is necessary for the contact stiffness formulation. If you are still doubtful about this, you can always use a regular material (other than MAT20) and provide s very high value for Youngs modulus (eg. 10^12). This will also make the component rigid. I hope this answers your doubt.
Ideally you should. But turns out that the solving procedure for every software is different and there is a slight variation in the results. Good thing is, this variation is negligible and the results can be considered as equivalent.
sir i appreciate the efforts u are putting in your videos and it is really helpful for me. can you perform crash test of a composite car. i am making a project in this area. so it would be helpful for me.
Hi ,first of all it is a very good demonstration, please provide path of LS Dyna Program manager want to run my file ,if there is alternative please let me know
Hello Sudhakar, LS Dyna student version is now freely available from Ansys website. We must strongly condemn the usage of cracked versions of any commercial software.
Hi Niranjan, this channel was created to help in developing tool skills. The main focus of every tutorial posted here is to demonstrate how to create FE models using a software tool. I believe that there are several resources out there which teach fundamental concepts, but very limited resources that teach how to apply these concepts using relevant tools. Hence, this initiative! However, I will take a note of your suggestion and try to include some important concepts in detail in the upcoming tutorials. Thanks!
![Hypermesh LS Dyna Tutorial [Dynamic Analysis]](http://i.ytimg.com/vi/6rANJ7IAh7Q/mqdefault.jpg)
Very nice explanation I am your regular viewer eager to know new contents of yours
Good to know Divakar! I'm glad you like my videos :)
Great video
Thank you!
Thank you so much bro.... U are explained point to point please make more video on ls dyna simulation...
Thanks for the suggestion. I will work on more LS Dyna tutorials soon!
Very good.Nice way to put things straight and clear. Please make videos on post processing.
Thanks! I will work on it.
Excellent video 👍
Thanks! I'm glad it was helpful.
thank you for this video
Glad it was helpful :)
Gud content.
Keep it up n thanks for posting.
Glad it helped!
Nice video... Thanks👍
Thank you :)
while explaning please explain the meaning of the command. Use and explain the theory behind in short
Hi , I saw your post on Linkedin. there are some corrections I would like to point out in your analysis nevertheless a good approach really appreciate it. Dont mind me correcting you , the model used by you is not a chassis its looks like an A surface of a hypercar usually called as Body side outer, and unless you have a proper material curve you cannot calculate Heat dissipated during the crash by using MAT18 As Mat 18 uses elasto plastic behaviour of the material which obeys Cowper symonds law and looks into isotropic hardening . You need to use Jhonson cook material model which has temperature factor if you want to calculate the heat dissipation during high speed impacts.
Hello Anoop, I really appreciate you pointing out this flaw. I will consider this correction from next time.
Thank you for taking the time to convey this useful information.
PS : If possible, can you share your email id or contact me through the 'About' page of this channel ? I would like to discuss more about this with you.
Can you make a video for radioss? Thank you so much
It is an awesome type of explanation about the frontal crash, with all the necessity boundary conditions and control cards.it helped me a lot .
Can you please let me know the Zero millisecond run procedure with all control cards for the same modal, which is the previous step of this crash simulation. Plzzzz
Can anyone tell how come the value of K (strength coefficient) (3:10) is 0.097 ? Wherever I have searched the value of K for aluminium lies between 180 - 400 MPa..
Thanks for this great video.
I have a quick question. In contact creation, don't we need to create a self-contact for the chassis itself to avoid any penetration during the impact occurring?
In your other video of this chassis, you did self-contacting by selecting chassis as master and slave at the same time, but here you did not do so.!
very good video, pls give us this question tutorials video. all setting of dynamic tube crush test - d=50mm t=3mm l=180mm v=10.7m/s impactor mass 91kg in ls-prepost.
Hey there, I dont usually work with LS prepost but I can definitely do this in Hypermesh. Thanks for the suggestion, I will work on it 👍🏻
What are K and N values??
And where can i get them for different materials
K is strength coefficient and N is hardening coefficient. You can get these values from any material database on the internet.
Thanka for yor video. Can yolu please compare the results which you read from Hyperview with the Ls prepost
Hello,
If it is the same run, results must be same, right? Correct me if I am wrong.
@@Aeroswap please show this comparison for an Analysis. I experienced many times for the effective plastic strain results are not shown same
Okay got it. Thanks for the suggestion. I will try to work on this soon!
Thank you so much for this , Keep up the good work . Can you please upload a video for analysis of an assembly
for eg. a balsa wing with carbon fibre reinforcement or something that involves more than one part. Im not really confident doing analysis for assemblies
Thanks for the suggestion! I will surely work on some assembly level analysis tutorials.
Can u make video on post processing of crash analysis
Hello, I have explained the basics of viewing crash results in Hyperview at the end of this video. I will also be posting a video focused on postprocessing using Hyperview.
Thanks
One thing I need to get cleared is, Can we give SPC boundary connection for a MAT20 component. Wouldn't it will through over constrained error? its like rigidizing an already rigid componenet
Hello,
Good question. I think that applying SPC to a component with MAT20 will not result in any error. SPC is essentially a location constraint, it does not make a component rigid (just holds the selected nodes in place).
On the other hand, a rigid material will actually make the component rigid. This is necessary for the contact stiffness formulation. If you are still doubtful about this, you can always use a regular material (other than MAT20) and provide s very high value for Youngs modulus (eg. 10^12). This will also make the component rigid.
I hope this answers your doubt.
You can constrain a rigid part ie the direction and rotation using mat 20 card itself.. above that if u give SPC it becomes over constrained.
Thank you for pointing this out Sushil!
This is valuable information and I will make sure to remember this in all upcoming LS Dyna tutorials.
Cheers!
Hi. Can u help me to do simulation of gypsum board subject to impact loading?
do i get the same answers if i import the mesh model into ansys and specify all other stuffs there like material boundary conditions and so on...?
Ideally you should. But turns out that the solving procedure for every software is different and there is a slight variation in the results.
Good thing is, this variation is negligible and the results can be considered as equivalent.
How to analyse using ls dyna prepost
sir i appreciate the efforts u are putting in your videos and it is really helpful for me. can you perform crash test of a composite car. i am making a project in this area. so it would be helpful for me.
Hello Saswat, I am currently working on a video about dynamic analysis of composite structures. It will be released soon 👍🏻
ty sir@@Aeroswap
sir can exactly tell me when it is going to be released or can give some hints. it is kind of urgent @@Aeroswap
Hi ,first of all it is a very good demonstration, please provide path of LS Dyna Program manager want to run my file ,if there is alternative please let me know
Sir from where we can start the ls dyna program manager....is we have to install it seperately or not
One question-Is joining a Lsdyna course worth?
Good video ... Could be Better if u have do some hand calculations
Do you mean hand calculations for deciding runtime and output frequency?
Aeroswap Yes ! Also like idealising it as a 1 D and can do displacement calculations
Thanks for the suggestion. I will see what I can do for similar videos from next time.
sir,would you like to give me the car model and wall model ,I will appreciate it very much
Can you please guide us how to download and crack the software package?
what is the name of this car model
Can I have to download LS DYNA PROGRAM MANAGER SEPARATELY?
Yahhh... actually the same question I had...but no response yet
How to get the K file of the model
@Aeroswap Bro can you share the crack version to download LS Dyna Software
Hello Sudhakar,
LS Dyna student version is now freely available from Ansys website. We must strongly condemn the usage of cracked versions of any commercial software.
you are just explaining the garbage in and garbage out... please try to explain some more deeper. so we will get to know better.
Hi Niranjan, this channel was created to help in developing tool skills. The main focus of every tutorial posted here is to demonstrate how to create FE models using a software tool. I believe that there are several resources out there which teach fundamental concepts, but very limited resources that teach how to apply these concepts using relevant tools. Hence, this initiative!
However, I will take a note of your suggestion and try to include some important concepts in detail in the upcoming tutorials.
Thanks!