ฝัง
- เผยแพร่เมื่อ 23 ก.ค. 2024
- Non-linear analysis provides better results than linear analysis as it simulates a more realistic version of the case under consideration. In this video, the complete process to set up geometric and material non-linearity using Hypermesh is shown in detail. We will use Hypermesh Optistruct user profile to run this non-linear static analysis.
The steps to implement follower loads, large displacement analysis and material yielding are shown in this video.
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![Hypermesh Nonlinear Contact Analysis [Optistruct Tutorial]](http://i.ytimg.com/vi/RbcoISvRasg/mqdefault.jpg)
![Hypermesh Nonlinear Contact Analysis [Optistruct Tutorial]](/img/tr.png)
Thank you for your efforts in making this tutorial!
Always great work! This time you clarified the complexity of non-linear analysis for following force and material nonlinearity. It's important to capture the plastic strain region as they remain a permanent deformation. You could also link your material data with a lab-tested stress/strain curve (material table). Only disadvantage of running nonlinear analysis is the computational cost, and I don't think the solver process has been developed much yet. Too many iterations, unknown errors, mesh dependency...
Thanks Ken!
Yes, we can use the TABLES1 card to define full stress-strain curve for the material. I intend to make a separate video focused on material nonlinearity.
As the objective of this video was only to give a brief introduction to nonlinearity, I used the simpler approach and provided just 1 slope(H) in plastic region.
Will soon be posting about boundary nonlinearity, especially contact nonlinearity!
Had to go for the simplest example as it takes a lot of time to solve bigger models. 😅
thanks a lot
awesome man, loved your video. pls make an video on CFD Tetra mesh with BL. pls if possible make a video on older version, say HM13.
Thanks! I will work on it soon 👍🏻
Hi,
I use LUSAS for my FEM analysis and was struggling to get plastic material properties (Slope / Hardening gradient Vs Total Strain) for Non linear analysis.
Can you please provide some reference for the same ?
Sir, i can not see "non linear static" option in analysis type button. There's only "non linear quasi static" and "non linear transient" options. Could you please help me? Thanks in advance.
Can you please mention the source from where you learnt hypermeah and also from where can we get such problem statements so that we can practice more such questions in hypermesh? ...
Hi, Do you have any Idea Regarding Non linear properties of Mild Steel
You are explaining clearly everything thank you but it will be more helpful for a beginner like me to understand the nonlinear analysis if you explain why you are taking those nparam options and what effect will be there
Hey Venkatesh, the NLPARM card is essential to activate the sub-step based iterative solver for nonlinear analysis. In this, we basically set up the number of increments(NINT) we want to use and the maximum number of load iterations(MAXITER) for convergence. The NLOUT card is to control the output of the analysis. We specified the frequency at which we want the output to be generated.
As this is difficult to understand, I will definitely work on a separate video to explain each of these settings in detail.
Thanks for the suggestion.
Thanks for the video.
Will you please suggest the boundary type non linearity example
Thanks Roshan,
Most common type of boundary nonlinearity is contact interfaces. I have posted a tutorial about nonlinear contact analysis on this channel. Please watch that to learn more about contact modelling.
The video was very useful sir ☺️👍🏻, please provide buckling analysis with example using optistruct solver
Thanks Sagar! I am working on a buckling analysis tutorial. Will be out soon :)
How you have selected value of (H) in material non linear
I got the error of aborted any idea of it
"MATS1 is presently not supported for second order shells (CQUAD8 and CTRIA6)."
Hi bro what can I do about this error? I used a spot welding connection
Hi Musa, the simplest solution would be to use 1st order elements. If that is not a valid option, you might have to search for some other material law.
@@Aeroswap thank you so much
Could you please provide the dimension of the geometry, in order to reproduce it? Thanks in advance.
Hi Diego,
The geometry dimensions will not matter. Just make sure the nonlinear settings are defined correctly as shown in this video. You will get accurate results for any geometry.
Does the stress really cap in yield limit in all case?
Yes! If the case it set up correctly with material nonlinearity settings, the stress should get capped at yield.
Good job bro
I am learning hypermesh past 4 months can you give any tip to get job related to it
Thanks a lot! I dont know of any specific Hypermesh jobs as of now.
@@Aeroswap thanks for your reply
Can you give you your what's app number for clarifying doubts
My email address is provided in the 'About' section of this channel. I check it regularly. Feel free to drop a mail regarding any queries.
Nice explanation as usual , can you tell me how long does it take to complete the analysis . my iteration progress is stuck at 0 % for more than 20 min . I am using core i5 with 8 gb ram
Thank you.
My configuration is i7 16gb ram. It did not take more than 2 minutes.
But it depends on the mesh size . If you have a finer mesh, it might take more time.
But still, 20 mins seems a bit too much. I would suggest aborting it and running again. Maybe that will fix the issue.
@@Aeroswap now i am getting Maximum number of time increment cutbacks reached,
analysis aborted. any ides how to resolve this?
Did you try increasing the MAXITER value in NLPARM card ?
@@Aeroswap yes I increased it to 200 still same
Then I guess something else is wrong. Did you follow all the steps as I showed in the video ?
Try some different settings, its not necessary to keep it just like I did in the video. If it still doesnt work, mail me the file. I will try to figure out the error.
Hi...sir
What material was used???
It is mild steel.
Sir,how can we define the stress-strain curve for orthotropic material in a particular direction only
Hi Neeraj,
Stress-strain curve can be imported directly from a CSV file using the Utility menu. Then this curve can be used while defining the material.
Thank you Sir, in isotropic material we can define the curve by mats1 card,but how can we define the curve in case of orthotropic material and is it possible to give curve in only one direction and constant values in all other direction in orthotropic material?
The MAT8 card image used in Optistruct defines a 'Linear orthotropic material'. As it cannot account for any form of material nonlinearity, we cannot use stress-strain curve in this material card.
If you want to define a detailed orthotropic material with nonlinear characteristics, you have to link Altair Multiscale design modeler to HM and use an externally defined material in the Optistruct analysis.
@@Aeroswap ok sir...thank you
@@Aeroswap Sir, I have found the option of MAT9ORT that provides the option for entering orthotropic material and also option to provide MATX28 and MATX68 cards which takes the input of stress strain function . Can that be used for entering the stress strain curve in different directions in case of orthotropic material
:D
keep shining bro as usual ;)
I tried but it wrote me tis message (The amount of memory allocated for the run is 1000 MB.
This run will use in-core processing in the solver.
MUMPS solver will allocate memory separately and may
run in different core (in/out) mode.
==== End of solver screen output ====
==== OptiStruct Job completed ====)
I can'y visualize the result why if you know ? I increase it untill 3000MB and nothing happened. Lot of thanx
Hello,
You cannot see the results as the solver just didn't run. There is no specific mention of the error but I am assuming it is related to memory allocation for the run.
Try resetting all memory options to default. Do not specify anything and try to run the solver again!
@@Aeroswap Thank you swapnil for the quick response ;)