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Post Processing Tutorial (with LS-Prepost)
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- Опубліковано 14 лис 2020
- In this video, I discuss few things that I am being asked frequently. Things that I cover here might be covered in a previous video, so here is the list of things that I mention in this video:
- How to control the states when animating the results
- How to display the Fringe components, and control their range
- How to extract the data using History option, and ASCII option
- What is the difference in the results from History and ASCII?
- How to use Cross Option to plot Force vs Displacement/Stress vs Strain curves
- How to show the velocity vectors?
- How to plot a the results (stress, strain, displacement) along a path, with the help of excel
Thanks, this is real professional work and very informative. I am so impressed. Wish you the best.
Thank you. Please share my video to your friends at school so more people can benefit.
thanks so much! the method about How to plot a the results along a path is just what i'm seeking for!
You are welcome. Please share my videos so more people can learn!
The easiest way to show the nodal displacements along the line you are showing is to select all the nodes along the line and put them into *HISTORY_NODE before the computation.
Yes, that's another way. Thanks for the input.
Appreciable job. Keep educating us.
Thanks! Please share my videos so it can reach and benefit more people!
Great Video. Thanks!
Please share my videos so it can reach and help more people 😁
Good job. Excellent details expressing
Thank you! If you learned something new, please share the video so more people can benefit! :)
Yet another great video - thank you!
It would be great if you could do modelling of composite elements, especially with T-Shell and show us how to post-process laminate composites (i.e., how to view stress variation in each layer of a laminate). Much appreciated again!
For the basics on composite simulations, you can check my tutorial:
LS-DYNA Tutorial 21: Concrete Column Wrapped with Composite Laminates
@@AmeenTopa Thank you for the quick response. I am passed the basics and have watched the video you mentioned. I was hoping for a tutorial that shows how to comprehensively post-process laminated composites. For instance, in your video, it is not mentioned how layers’ stresses can be viewed. As far as I am concerned, there exists no such video on UA-cam. Besides, modelling composites with 3D and T-Shell elements will be very instructive to all - just a suggestion!
Thanks again!
@@zackvizeman5329 Dear Zack,
Thank you for your suggestion. I am aware of that. In fact, you are not the first personal that requested such a video. Many have already asked me for a more detailed composite video.
However, unfortunately I had to stop making requests due to my tight schedule. Since last year, videos that I am uploading are old videos which I have pre-recorded them for my collaboration work.
I am only available now for consultancies and paid work. I hope you understand.
Lastly, for your question, you can check the result on the integration points. This will give you the stresses at different layers.
@@AmeenTopa I understand.
As for teh resiults, after 7 hrs of search, I figured out how to get theresults stored on tyeh integration point. It is not as easy as you stated! :)
@@zackvizeman5329 Well, for me it is very obvious. I've been doing this for more than 10 years already :)
It's help me a lot. Thanks you sir!!
Most welcome! Please share my videos so more people can learn. :D
I want to extract the Shear force-Height along the pier data for my collision model. please can you till me what is the correct way to extract the data for a Shear force curve?
How to extract the nodal displacement in local cordinate system.
Can you please explain I am new to LS Dyna. I want to extract the displacement of node as my model is moving, the global value is recorded and how do I create a cordinate system as model is not aligned to the global axes
Is there convenient method to display the Z-displacement of the top surface?
Click on F8 for the blank tool, blank (hide) or the elements of the top surface, then click on Reverse blank option and everything will be hidden except the top surface. Then go to Fringe contours.
@@AmeenTopa Thanks a lot.
Perfect! Thank you Sir
You are welcome! Please share my videos so it can reach more people! :D
@@AmeenTopa Yes sure, Sir
Brother, iam getting this warning, one element failed due to negative volume.
Is this warning bad for our simulation?
This is because you are using eroding surface. If the material input are correct, then no problems. Just make sure you have fine mesh.
@@AmeenTopa thanks brother .
You are really doing a great job.
Keep doing , as it helps a lot to a needy people.God bless you.
@@sashanknegi4867 You are welcome. Please share my videos so it can reach more people! :)
ty sir!
Thank you! Please share my work if you find them useful!
Hello ,i want to ask how can i make a quarter ball.The solid Mesher can only make full balls,and in Solid Option only have shell apartment. Thank you
Watch my tutorial: sphere drop on water. You will find the answer there
Hello to the author of the channel. I am very interested in this topic. I want to implement the process of compacting the ground with a road roller. Is it possible to get this model for research ? or maybe there are specialists who did soil compaction in LS-Dyna? - I would like to learn
Thank you for contacting us.
Unfortunately, the model is not available because it is part of unpublished work. Secondly, in this model, we used the Aluminum model, not soil.
With that being said, we offer online consultation services, if you are interested. Please contact us from the website below:
sites.google.com/view/topacademyofficial/about-topacademy
Hello Ameen, is it possible to apply a multiplier to the fringe component? Let's say, I have stresses in GPa, but it could be more readable if I can plot it in MPa.
As far as I know, that's not possible with LS-PREPOST.
Hi Ameen,
I want to extract the load-displacement data for my tensile specimen model. In the D3_plot file, I extract the displacement by History-> Element-> Select 1 element in the middle of the specimen and plot, while the force I use ASCII_BNOUT. Is it the correct way to extract the data for a load-displacement curve?
History, Element, you will be plotting the true stress. If you want the load, then you can use ASCII BNOUT or ACSII SECFOR
Check out this tutorial.
ua-cam.com/video/llNL8Kb1pQg/v-deo.html
That is nice video. If you have four fixed buondary constraints. How do you plot a reaction force on the each BC individually?
Thanks!
DATABASE ASCII SPCOUT or BNDOUT
@@AmeenTopa thank you so much.
SPC works fine not BNDOUT I don'tknow why. The main problem I am facing is I have four screws that supports the load unequalily and I want to know which one of the screw has the maximum reaction forces. However, in your case we have to select all the nodes which doesn't show me individual reaction forces. Is there any way to group these nodes and display on post- processing?
By the way when I use MPC as BC, both SPCOUT and BNDOUT options doesnt load the result.
Thank you so much for your help as I am learning a lot with your videos.
Hi sir how to plot velocity vs time
You know how to plot displacement vs time, then you should be able to plot velocity vs time.
Excellent tutorial. Is it possible to display a localized area within a prescribed range of displacement or stess?
Do you mean to display the Fringe component (colors) within a range and the rest are grey?
Yes, possible. Through the Fringe Range option.
It is also possible to display the ELEMENTS within a stress range (or any other results) while the other elements that are outside this range are hidden. This is also from the fame Fringe Range option.
In the Fringe Range, you have Upper and Lower with boxes next to them. You tick on those both boxes and define the range. Now, the elements outside these range will be grey (by default). You can change that color, or make it transparent by sliding the button next to it.
@@AmeenTopaYeah. Thank you for your detailed explanations.
You are welcome
How to use axis of symmetry to reduce run time? Please reply asap
Axis of symmetry: means from 2D simulation to 3D simulation. You need to use the proper ELFORM in SECTION SHELL for axisymmetric simulation.
If you mean plane of symmetry, then you can check my TNT blast tutorial where I created quarter model.
I hope it helps.
@@AmeenTopa Thankyou
Can you make a video how to install and use LS-Dyna student version recently given by ansys
Sorry, I use the official version provided by my university. So I cannot have another version of LS-DYNA in my PCs
Sir, for it to display von mises colors , u need ASCII files ? for my car crash simulation per example
No, no need. The Von Mises is already written in the d3plots.
@@AmeenTopa ok thanks a lot , because i still cant find a solution for my crash problem , the colours in von mises/tresca still wont change during the simulation , it stays all blue , i searched every google file , every tutorial , tried runing several simulations , colors never change
Salam. Sir, do you have the tutorial of the indentation of the spherical tip shows in the beginning of the video?
WaAlaikumussalm. No. You can make the file yourself. All the keywords and basics are covered in my previous tutorials.
I cannot share any details regarding this simulation because it is part of unpublished work.
@@AmeenTopa for indentation, can we use prescribe motion? and may i know, let say i want to make a scratch test model. The indenter have normal force acting downward, while the indenter moving horizontally, velocity is horizontal. what is the keywords to make the normal force of the indenter acting downwards.
@@wnfresourcessdn.bhd.hafizu5928 Yes. You can. Please check my Tensile Test Tutorial, and Three point bending tutorial.
Hello Dear, can we plot the damage (Compressive and Tensile) contour fringe ranging from 0 to 1 where 0 indicate no failure and 1 indicate deleted element?
What material model you use? If composite, you can check my tutorial on Concrete Column wrapped with Composite Laminates.
@@AmeenTopa Thanks for the response dear...I saw that tutorial but the thing is I am using HJC(111) concrete model with MAT EROSION as 0.13 which lead to effective plastic strain range from 0 to 0.17 only.
@@mohitbisht8503 If you are using MAT ADD EROSION then it is not possible to have plot contours for damage. With MAT ADD EROSION, we don't have damage, we have only element erosion. Damage means the material properties degrade while erosion means the element will be deleted.
@@AmeenTopa Thanks for the response dear and good news is i got the damage contour by using Extent Binary which i saw in one of your tutorial. So thanks to you again for that tutorial.
I am new to LS-DYNA and I want to know why I can't animate my simulation. I followed one of your tutorials about the ball impacting a plate and I want to know how I can animate.
I think you have missed something. Did you define DATABASE D3PLOT?
@@AmeenTopa yes
Make sure that you didn't assign RIGID to both parts. Only the ball should be rigid.
@@AmeenTopa I follow all the instructions you did in that ball impact tutorial and I don't know why the animation isn't working.
@@redsabre_ if you are doing the ball Impact on a plate, it shouldn't be a problem. The video has been there for years and hundreds of people were able to do it. Please watch carefully one last time, in slow motion.
Hello Sir
Thanks for this video! I have a small question. Can we change the max value of the Y axis? Eg:- my Force plot shows 28-29N and my y-axis ends at 30N. Can I make my y-axis go to 40-50N with the plot remaining same at 28-29 level?
Yes, in the plot window, under the Scale tab, you have the options Xmin, Ymin, Xmax and Ymax.
@@AmeenTopa Ohh found it, Thanks!
@@AmeenTopa Sir, I have done 3 impact analysis with 3 different materials (3 different d3plots). I wanted to know if I can plot their resultant force graphs into a single graph for showing comparable analysis?
You need to save the result first from the three different simulations. Then you can use the LOAD option to import them into a single Post Processing session.
@@AmeenTopa First to open any of the d3plot and load using 'Load' in Plot Window and then load the csv file?
Hi Ameen!! Without your tutorial my work will be slow. I am doing vehicle impact on concrete column.How to keep the original color of vehicle after impact when I go to Fricomp all part change color? Thank in advance
Hi Met mey,
Firstly, display all the parts with their colour. Then, hide all the vehicle part. Now you have only the column. Next, go to the Fcomp and display what you want to see (stress, strain, etc). Once you got this the column, you can unhide the vehicle.
To hide or unhide the parts, you can use the Assembly and Part tool. Just click on F2 for a shortcut to this tool.
@@AmeenTopa Thanks for fast reply. Sorry because my question above is not accurately. I mean if I want to display all these two parts (column and vehicle ) in the same interface and when I go to Fcomp I just want to see the color change in column and the car still in original color but shows deformation.
Hey,
Yes, I understood your question correctly (I guess). That's why I said after you show the Fcomp of the column, and unhide = display again the car parts. Now, all parts will be there but the column will have the Fcomp colours.
@@AmeenTopa Thanks so much. It works now
You are welcome. By the way, you know Keoagile? Your comment on my other video was removed automatically by UA-cam.
Nice video! Keep it up Ameen!
Thanks! Please share my videos so it can reach and help more people!
Software download:
www.getintopcfree.com/simulators/ls-dyna-free-download/
Hello sir ,
is it possible to have your e mail
regards
Put your email address here and I will follow up in my free time.