Hypermesh Nonlinear Analysis [Optistruct Tutorial]

[@Aeroswap]

Thanks to Emmanuel Vassilakis for all the help in making this video!

[@emmanuelvassilakis5630]

You're welcome! That was a very nice presentation.

[@rahulcr7224]

Hi bro, Your video is spectacular and informative. Generally the CAE videos are not fully covered with it's simulation part but you have covered everything that people like. Please don't stop posting these videos as its very helpful for beginners like me

[@Aeroswap]

Thank you Rahul ! I'm glad you like my videos and and that they are helping you to learn something new! I am always working on new videos so make sure to subscribe :)

[@rahulcr7224]

@@Aeroswap I already subscribed...it's my request you that please don't stop posting your videos 😊

[@Aeroswap]

Sure thing! 👍🏻

[@Thierry080]

Great video, as usual. You're very concise, to the point and efficient. Please keep it up!

[@Aeroswap]

Thank you! I'm glad you liked the video.

[@kenkim2687]

Thanks for uploading the 3D nonlinear swap! I like how you used hexmesh for this because tetmesh often causes numerical errors in nonlinear environment.

[@Aeroswap]

Thanks Ken!

[@s.s.divakar7911]

Good job I like all your videos with good explanation. continue good luck

[@Aeroswap]

Thanks a lot! I am glad you like my videos.

[@NSK_24]

It’s informative, thanks for video Can you make simulation videos on NVH !!

[@Aeroswap]

Glad it was helpful. Yes, I am currently working on some NVH tutorials :)

[@sculptureyou1235]

Super bro and tq for uploading cad model also

[@Aeroswap]

Thanks! I'm glad it was helpful.

[@satwikaaero1886]

Awesome explanation 👍✌

[@Aeroswap]

Thanks for watching!

[@kenkim2687]

I think you uploaded the CAD file from your previous tutorial. Could you upload the CAD for this exercise?

[@Aeroswap]

Oh sorry. I will change the file as soon as I can. Thank you for pointing this out 👍🏻

[@ezeddinekaroui8690]

Hello, Regarding RBE3 use for force what meas this error : *** ERROR # 329 *** RBE3 element 276 cannot support a x-moment - check element data. ??

[@cheerlaganesh7754]

Great video 👌 Good Explanation

[@Aeroswap]

Thank you!

[@vishnur6455]

Bro please upload the 3d modelling and meshing video of this components....then we can get a complete pakage like.. modelling, meshing, analysis and post processing.

[@aak4866]

Hi Sir really nice tutorial, Just one doubt cant we give values such as Yield stress, UTS etc for the materials ehere in optistruct because from the MAT1 type selected only E, Nu were there?

[@Aeroswap]

MAT1 is a linear isotropic material. As this is a linear material, yield stress has no significance here. This material cannot be used to show nonlinear behavior like plastic strain. If you switch the MASTS1 entry in extended options of MAT1, you can include nonlinearity in the behavior. I have demonstrated the process to do this in my Nonlinear analysis tutorial. Please check that for more details!

[@busracaner3646]

How can I defined contacts for multiple parts(assembly) to perform topology optimization in hypermesh optistruct?

[@praveeningavle7274]

please upload the current CAD for practicing. i think you mistakenly uploaded previous tutorial CAD....

[@Aeroswap]

Sorry for the inconvenience. I have updated the link with proper CAD model. Please check.

[@praveeningavle7274]

@@Aeroswap thanks for immediate action...

[@pravinakuwar2956]

While creating contact in between Bracket and lower bush, I m facing the problem. The pop up window is occurred saying that "No contact was detected for specific inputs". Please help.

[@Aeroswap]

Hi Pravina, Please increase the tolerance value sepcified while creating the contact and try again. This will resolve the issue.

[@yagnemanilreddy4298]

hai if possible can you do video on analysis of gasket and how to read results

[@ourterm5758]

Can you also do tutorial on hypergraph? :)

[@Aeroswap]

Thanks for the suggestion. I will work on this topic soon!

[@krazykiran]

nice work sir. Can you make a video related to car seating analysis

[@Aeroswap]

Thanks for the suggestion. I will work on this soon!

[@krazykiran]

@@Aeroswap Can you share your mail id ?

[@Aeroswap]

My email id is given in the 'About' section of this channel. Feel free to write an email regarding doubts or suggestions!

[@sachinms868]

Hi, Even after increasing the MAXITER value also..same error is coming.(max.no.of time increment cutbacks reached and also sever element distortion detected). Any suggestions?.

[@Aeroswap]

Severe element distortion is usually caused by incorrect material data or very high force values. Make sure that you have used consistent units for the analysis. Also check the applied force values and material density.

[@stefaniamagnettigisolo5775]

hello, can I another question please? Do you if it is possibile to define a force that keeps tangential to a surface or a profile? I ask because I have a surface whose profile changes, so i cannot define a tangential force with x,y,z directions. Thanks

[@Aeroswap]

So you want a shearing force on the surface?

[@stefaniamagnettigisolo5775]

@@Aeroswap yes, I think

[@Aeroswap]

If you want perpendicular force, you can opt for pressure load which will always be perpendicular to the surface at all locations. However, if tangential force is needed, you have to create separate loadcollector for each surface and assign the vector direction manually. Then these loads can be combined using LOADADD as I previously explained.

[@stefaniamagnettigisolo5775]

@@Aeroswap ok, thank you very much...

[@asoregaonkar9161]

Could you please show us rubber grommet compression analysis with collar after bolt pretension.

[@Aeroswap]

Thanks for the suggestion! I will see what I can do.

[@asoregaonkar9161]

@@Aeroswap Thanks

[@sanketyewale3477]

Bro, Your videos are nice but try to explain more about the cards and why we are selecting something under particular card, I hope you will take this as suggestion TY

[@Aeroswap]

Thanks for the suggestion Sanket. I will try to make the tutorials more informative!

[@mandarpitale9810]

Hii, can we get static , transient thermal and fatigue analysis on engine block, it will would really helpful and concept clearing as well.

[@Aeroswap]

I will work on it. Thanks for the suggestion.

[@puneetkukreja2818]

Hello, When creating Hexa mesh. first I generated Hex Mesh for the bracket. later when I was trying for other components. It was going on the same component in which Bracket Hex Mesh was there. I tried changing the current component but facing the same issue.

[@Aeroswap]

Hi Puneet, You can right click on the desired component and set it as current. You can also use the current collector selection box present at the right bottom corner of Hypermesh window to do the same. If this does not work, I would suggest creating a new component every time before creating the mesh. A newly created component will always be set as the current component. I hope this information helps.

[@puneetkukreja2818]

@@Aeroswap Thanks

[@pali_palitrinhvan9919]

hi you, i have a question related in the single surface Patten1 Card image: contact Type:slide Ssid : part a and part B Msid: part a and part B Morient: norm Discret:S2S Trach:Consli Patten2 Card image: contact Type:slide Ssid : part a and part B Msid: part a and part Morient: norm Discret:S2S Trach:Finite so the rusult is penetration please help me how to right setup?

[@stefaniamagnettigisolo5775]

Hello, thank for the video. It is possible to run a static analysis by applying 2 loads contemporarely?

[@Aeroswap]

I'm sorry but I didn't quite understand your question. Can you please elaborate?

[@stefaniamagnettigisolo5775]

@@Aeroswap yes. i have subassembly to analysis, which is loaded with 2 distinct forces. Yet, when I define the LoadStep, in the window "load" i can select only one force, as only one constraint. So, I was asking if it is possible to run the analysis by applying both the loads... thanks

[@Aeroswap]

Yes, that can be done. Create a third loadcollector and set its card image to 'LOADADD'. Then specify num value as 2 and select the first two loadcollector in the table. Make sure to use scale factor values as 1. Now you can apply this LOADADD collector in the LOAD field of the analysis. This will combine the two forces and apply them simultaneously. I hope this helps!

[@stefaniamagnettigisolo5775]

@@Aeroswap Yeah it worked! Thank you very much! i was really screaming mad...ahaha. Thank you!!

[@Aeroswap]

Good to know it worked :)

[@sudarshan945]

Bhai how do u do calculation for analysis

[@dhruvpatel9035]

Hello. Thank you for this video. You explained the procedure very aptly. However, i get the Fatal error in HyperWorks solver view screen. I am assigning the number of CPU cores as 4. Let me know what can be done. A fatal error has occurred during computations: *** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted.

[@Aeroswap]

Hello Dhruv, this is not an error regarding number of CPU cores assigned. This error message points to incorrect nonlinear parameters. I suggest you to increase the number of iteration (MAXITER) from the nonlinear cards and see how it goes. Sometimes, a bit of trial and error needs to be done with the nonlinear settings as per the analysis under considertaion. Hope it helps!

[@seankang771]

How to know permanent deformation? Is it possible in this case?

[@prabhsharansingh9112]

i was trying the same analysis on a self generated cad model, when i try to create contacts, it shows no contact was detected for specified inputs. Can anyone help ??

[@Aeroswap]

Try using a higher value for tolerance when using the contact creation option. The proximity between surfaces may be different for each CAD.

[@JavedAhmed-p9w]

*** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted. Please help me to resolve this.

[@neerajkumar-rd1yy]

Sir,how can we solve the problem of severe element distortion causing no convergence?

[@Aeroswap]

Hi Neeraj, this error is usually the result of incorrect boundary conditions or material definitions. Please check consistency of units in the model. This will resolve the error.

[@neerajkumar-rd1yy]

@@Aeroswap okay Sir

[@santoshghimire2668]

Hey brother. I followed your tutorial and used your cad file. But when i am trying to create contact points. It says that no contact was detected for input.

[@Aeroswap]

Hi Santosh, Try increasing the tolerance value used during contact creation process. This will resolve the issue.

[@sreddy5500]

I tried the same simulation without considering plasticity in material, but the simulation stop after some time ( error: needs more iterations to solve). Please give suggestions to overcome the problem. Thank you

[@Aeroswap]

Increase the MAXITER value from NLPARM card. This will do the job 👍🏻

[@lokeshbiradar8415]

why your carrying out bolt prension load analysis?

[@Aeroswap]

Hello Lokesh, Although it might seem that there is no use of performing this type of analysis, it is important to understand that this is seldom a standalone case. Bolted jointed are a part of countless mechanical structures. If you can model a bolt as shown in this video, you can model a bolted joint in any other analysis. This video demonstrates this important topic as a base for other complex analyses. I hope this answers your query!

[@vishnurockstar143]

i am not getting solution as followed your steps . getting this error @*** ERROR # 4965 *** Maximum number of time increment cutbacks reached, analysis aborted.@. can you any solution for this error.why it is getting this error it will helpfull for us

[@Aeroswap]

Hi Vishnu, Try creating a new loadcollector with card image 'NLADAPT'. Set the max cutback option to 50 and assign this loadcollector to the NLADAPT field in nonlinear loadstep. This should resolve the error.

[@MechShanG]

please share the fem file for this analysis.. It will help us alot.

[@sejong4672]

Thank you so much for your lecture. I think I’ve followed your instruction perfectly. But, there occurs an error when solving the second load step. According to the output file, it seems that there occurs excessive displacement (or contact force), leading to so-called overclosure error. Could you tell me how to solve it? The below is the hm file I generated (I added an additional SPC on the bolt to avoid the error but I failed). drive.google.com/file/d/1eWlifPIm8Vg6x0P_kj92EtNy5OoA44VB/view?usp=sharing drive.google.com/file/d/1WkW77UfOEYu01yANxYGUUAkcun87s2WV/view?usp=sharing

[@Aeroswap]

Hi Sinwoo, Have you checked the animation files for the analysis. It will give an idea about how this excessive displacement is happening. Then we can make changes to the setup accordingly.

[@sejong4672]

@@Aeroswap Hi. The animation for the load step#2 is not available because even a single iteration could not be converged. I think the parts are penetrating each other even with the contact pairs. I was really happy to find your video because the example demonstrated is almost similar to what I’ve tried to solve. I really want to solve this problem. Could you help me?

[@Aeroswap]

Alright, well. Can you please connect with me via email. It would be better for communication. My email address is provided in the 'About' section of this channel.