Dear Ameen Sir, thank you very much for uploading very informative LS Dyna related videos on your channel. I even wish to thank you for teaching us blast based simulation problem using CONWEP method. I was one of the viewers to request you to teach us such simulations. Now there is one more request. Can you please teach us how to use Initial_Volume_Fraction_Geomety card in LS DYNA?
Excellent thank you so much, one doubt, can i give initial temperature like 200 deg to specimen, in operations like deep drawing or stretch forming, drilling etc..before the process starts,,
Hallo Herr Topa. Ich stelle meine Frage: With the IGES file I made I get a mesh of more than 31000 nodes for the drill bit. The program runs but it will take almost 11 days according to the LS-RUN. I have installed the LS-PrePost V4.7.17. My computer has 18 GB in RAM and the processor is i7 up to 4GHz 4-core. Is it possible to resize the mesh without having to restart from the beginning? Or should I delete the current mesh of the tool and import again the IGES file to make again a coarser mesh but keeping the Tool name in order not to lose the relationships? Thanks in advance.
Unfortunately, you need to remesh from the start using the iges file again. There is no other way to do it. For the drill bit, it is common to model it as RIGID part. This will save the computational time..
Hello may I ask you how to show an actuation for Sma wire from heating. I am new to this software i really hope you could help by showing a little demo. Appreciate it very much
SMA is shape memory alloy, right? You can check the following reference: www.dynalook.com/conferences/12th-european-ls-dyna-conference-2019/metallic-materials/karlsson_dynamore_nordic.pdf
Hello ameen bhai Please make a tutorial on friction analysis in LS dyna it is not available on TH-cam and i required same. So please make tutorial for friction and vibration analysis. And inform me for the same if you will proceed and up to when you will post that video. Please do soon, please
Error 30186 (INI+186)the inertia tensor of rigid body #1is too small for the accuracy of the computer to handle.Please add mass or increase inertia.The LS-DYNA time step size should not exceed 2.714E-87 to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface.жError 30006 (INI+6)initialization completed with 1 or more fatal errors please check messag file I'm getting this error. Pls help
Dear Ajay, thanks for your kinds words. Currently due my time constraints, I will do only videos for those projects for which I provide consultancy services. I just record while I give training to my clients. As much as I love to do requests of my followers, only if I have free time I will do them.
Dear Ameen Topa From the reply message, i could understand that you are giving training to your clients. may i become your client to take training class? Please tell me the details... my mail_id selvamraj1@gmail.com I am waiting for your reply to learn LSDYNA
Thank you bro! I get a problem that Error 40359 the minimum time step has been reached and the maximum temperature change is greater than specified temperature change 4.7690E+07 max allowed temperature change 1.0000E+04 Please give me some help!
The LS-DYNA time step size should not exceed 2.606E-06 to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface. Thermal dynamically allocated memory: 26M Memory required to begin solution: 4707K Additional dynamically allocated memory: 45M Total: 75M have this messages, Im running with an amd processor how long would it take me to generate the 3d plot? initalization completed 1 t 0.0000E+00 dt 5.00E-06 begin thermal step 09/28/21 17:32:36 1 t 0.0000E+00 dt 2.50E-06 begin thermal step 09/28/21 17:40:22 1 t 0.0000E+00 dt 1.25E-06 begin thermal step 09/28/21 17:48:10 1 t 0.0000E+00 dt 6.25E-07 begin thermal step 09/28/21 17:56:38 these are the only values I get.... TY so much for ur contribution
***Error 20368 (STR+368) mat/set id used in prescribed v.c. must be defined as rigid see card no.= 1 mat= 1 in the velocity b.c. input section *** Error 20368 (STR+368) mat/set id used in prescribed v.c. must be defined as rigid see card no.= 2 mat= 1 in the velocity b.c. input section I'm getting this error. Pls help
The drilling part should be Rigid because you are applying Prescribed RIGID motion. If you want your drilling bit to be deformable, then you need to use Prescribed motion SET
@@AmeenTopa Thankyou for replying. After making that change I got a new error. I am using an elastic material *** Error 10144 (KEY+144) CHECKING PRESCRIBED MOTION INPUT [*BOUNDARY_PRESCRIBED] vector set for imposed boundary # 1 *** Error 10144 (KEY+144) CHECKING PRESCRIBED MOTION INPUT [*BOUNDARY_PRESCRIBED] vector set for imposed boundary # 2 *** Error 10133 (KEY+133) input data failed with: 2 errors
Thanks Ameen for the video. Very informative.
You are welcome. I hope you learn something from it.
Yet another absolutely fantastic tutorial! MUCH MUCH APPRECIATED :)
You're very welcome! Please like and subscribe. It really help! :D
Thanks very much. Very informative and interesting tutorial.
Glad it was helpful!
Thank you very much
Great efforts
Please give some basic tutorials for reinforced concrete modeling
th-cam.com/video/Kzc5VFetBdE/w-d-xo.html
Sir Ameen, thank you very much for your work. Great videos.
Tell me, please, if EPS and ES are mixed up on 24:10-24:50?
Thank you for pointing this out!! Yes, I have mixed up between the stress and strain.
The drill also rotates in the wrong direction), but this is nonsense.
Thanks for sharing your experience, please don't stop.@@AmeenTopa
Dear Ameen Sir, thank you very much for uploading very informative LS Dyna related videos on your channel. I even wish to thank you for teaching us blast based simulation problem using CONWEP method. I was one of the viewers to request you to teach us such simulations. Now there is one more request. Can you please teach us how to use Initial_Volume_Fraction_Geomety card in LS DYNA?
There are two videos on blast load with CONWEP method.
thank you so much Ameen Topa you are the best !!!
thanks!!
Excellent thank you so much, one doubt, can i give initial temperature like 200 deg to specimen, in operations like deep drawing or stretch forming, drilling etc..before the process starts,,
Yes. Use boundary heat flux if you have a temperature flowing in to your specimen or use initial temperature set to assign an initial temperature.
Thank you very much. Learnt a lot of new things 👋🥂
You are most welcome.
Hallo Herr Topa. Ich stelle meine Frage: With the IGES file I made I get a mesh of more than 31000 nodes for the drill bit. The program runs but it will take almost 11 days according to the LS-RUN. I have installed the LS-PrePost V4.7.17. My computer has 18 GB in RAM and the processor is i7 up to 4GHz 4-core. Is it possible to resize the mesh without having to restart from the beginning? Or should I delete the current mesh of the tool and import again the IGES file to make again a coarser mesh but keeping the Tool name in order not to lose the relationships? Thanks in advance.
Unfortunately, you need to remesh from the start using the iges file again. There is no other way to do it.
For the drill bit, it is common to model it as RIGID part. This will save the computational time..
@@AmeenTopa Thank you
Hello may I ask you how to show an actuation for Sma wire from heating. I am new to this software i really hope you could help by showing a little demo. Appreciate it very much
SMA is shape memory alloy, right? You can check the following reference:
www.dynalook.com/conferences/12th-european-ls-dyna-conference-2019/metallic-materials/karlsson_dynamore_nordic.pdf
@@AmeenTopa yes shape memory alloy. Ohh thanksss i will check it outt hehe
Hello ameen bhai
Please make a tutorial on friction analysis in LS dyna it is not available on TH-cam and i required same. So please make tutorial for friction and vibration analysis.
And inform me for the same if you will proceed and up to when you will post that video.
Please do soon, please
Hi Fareed, if you wait for me, it will take long time. Please check the following:
th-cam.com/video/I3A96om3a20/w-d-xo.html
Error 30186 (INI+186)the inertia tensor of rigid body #1is too small for the accuracy of the computer to handle.Please add mass or increase inertia.The LS-DYNA time step size should not exceed 2.714E-87 to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface.жError 30006 (INI+6)initialization completed with 1 or more fatal errors please check messag file
I'm getting this error. Pls help
This could be due to the meshing or properties of the material. I have insufficient information to give a useful answer.
thank you so much
No problem, please share my videos so more can benefit! :D
hallo sir, can you make a simulation on metal that had been heat with untill melt?
Hmm. It is interesting topic. I am not sure if it can be done or not. Unfortunately, I don't have the time to look into it.
@@AmeenTopa really appreciate if you can do that
@@muhammadbadrulaminbinsalle8740 Sorry I am not a full time TH-camr. I barely got time to do my own research work.
Can you please teach us how to use Initial_Volume_Fraction_Geomety card in LS DYNA?
Dear Ajay, thanks for your kinds words. Currently due my time constraints, I will do only videos for those projects for which I provide consultancy services. I just record while I give training to my clients. As much as I love to do requests of my followers, only if I have free time I will do them.
@@AmeenTopa SIr, I understand your busy schedule. Please take your time.
@Ajay I'm also trying to use this keyword. Let me know if you figure a way out. I'm getting an error constantly
Dear Ameen Topa
From the reply message, i could understand that you are giving training to your clients. may i become your client to take training class? Please tell me the details... my mail_id selvamraj1@gmail.com
I am waiting for your reply to learn LSDYNA
Thank you bro! I get a problem that Error 40359
the minimum time step has been reached and
the maximum temperature change is greater than specified
temperature change 4.7690E+07
max allowed temperature change 1.0000E+04
Please give me some help!
You need to change the parameters in CONTROL TIMESTEP. I don't have the details of your model so I cannot give a more detailed answer.
@@AmeenTopa yeah, however its temperature change is so big, i think something else is wrong. Thank you for replying!
Reduce the thermal timestep and use variable thermal timestep.
@@AmeenTopa OK！ I will have a try, thanks very much!
What software are youusing
LS-DYNA
The LS-DYNA time step size should not exceed 2.606E-06
to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface.
Thermal dynamically allocated memory: 26M
Memory required to begin solution: 4707K
Additional dynamically allocated memory: 45M
Total: 75M
have this messages, Im running with an amd processor how long would it take me to generate the 3d plot?
initalization completed
1 t 0.0000E+00 dt 5.00E-06 begin thermal step 09/28/21 17:32:36
1 t 0.0000E+00 dt 2.50E-06 begin thermal step 09/28/21 17:40:22
1 t 0.0000E+00 dt 1.25E-06 begin thermal step 09/28/21 17:48:10
1 t 0.0000E+00 dt 6.25E-07 begin thermal step 09/28/21 17:56:38
these are the only values I get.... TY so much for ur contribution
I am not sure. I need to know more details about your PC. How many CPU threads are utilized for running this simulation
***Error 20368 (STR+368)
mat/set id used in prescribed v.c.
must be defined as rigid see card no.= 1 mat= 1
in the velocity b.c. input section
*** Error 20368 (STR+368)
mat/set id used in prescribed v.c.
must be defined as rigid see card no.= 2 mat= 1
in the velocity b.c. input section
I'm getting this error. Pls help
The drilling part should be Rigid because you are applying Prescribed RIGID motion.
If you want your drilling bit to be deformable, then you need to use Prescribed motion SET
@@AmeenTopa Thankyou for replying. After making that change I got a new error. I am using an elastic material
*** Error 10144 (KEY+144)
CHECKING PRESCRIBED MOTION INPUT [*BOUNDARY_PRESCRIBED]
vector set for imposed boundary # 1
*** Error 10144 (KEY+144)
CHECKING PRESCRIBED MOTION INPUT [*BOUNDARY_PRESCRIBED]
vector set for imposed boundary # 2
*** Error 10133 (KEY+133)
input data failed with: 2 errors