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Nonlinear Composite Analysis using Hypermesh [Optistruct Tutorial]
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- čas přidán 18. 02. 2021
- In this video, we will perform a nonlinear composite analysis using Hypermesh. The Optistruct tutorial will cover all topics like geometry creation, geometry editing, analysis setup and postprocessing of results.
This Hypermesh Optistruct Tutorial will focus on evaluating composite stresses developed in a ply-laminate composite.
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In older versions of Hypermesh, the Composite Browser may not be available. In that case, the ply/laminate can be created using the Model Browser as shown in this video -
czcams.com/video/ww7hUAYJpSU/video.html
You have got a new subscriber Sir. These high quality videos with such crystal clear explanation are not available on CZcams. You are doing a great work. Thank you.
Glad to know the content is helpful :)
Wonderful video as usual!
Thank you!
Hi Swapnil, nice to see you :) Your presentation of a composite plate impact was very good, however I would like to point out that in cases involving impact on composite structures we are usually interested in calculating the failure/damage of the structure, thus an appropriate (or more than one) failure material law (Hashin, Puck etc.) should be defined. In optistruct, this is done through the MATF card. As you know, it is possible for a composite structure to have failure in certain elements without failure of the entire structure.
Hello Emmanuel,
Thank you for the information! The MAT8 card can only define a 'linear orthotropic' material. According to my knowledge, it is not suitable for applications where stress crosses the elastic limit. Keeping this in mind, I designed this load case such that the maximum stress in all plies remains below yield at all times. So essentially, there in no material nonlinearity in this analysis (only boundary nonlinearity due to contact).
As you mentioned, failure may be assigned using MATF to make this analysis more accurate. I will try to create a follow up tutorial to this where failure can be observed. Thanks a lot for your insights on composite modeling. This will be of great help :)
Dear Sir,
Thank you for these great videos. If you may have some related paper, I request you to also share the validation of these results from literature.
Great video 👍
Thank you!
Excuse me Prof, do yuo know if it is possible to perform a non linear composite analysis with optistruct 2017?
HI! Could you do a video on one and two layers of FRP retrofitting on beam or column specimens using Hypermesh.
Hello,
It is not possible to model reinforced composites directly in Optistruct. It only supports ply-laminates (orthotropics).
To accurately define FRP, separate applications like Altair Multiscale Designer have to be used.
I will still consider your suggestion and see what I can do about it. Thanks :)
How do you handle components with different laminates in the new composite tab? Do you asign the different plies (in a secound laminate) to a different set then? Also how do you handle a composites with different materials? (Asking because you asign the property with the material to the component directly) Thank you :)
Good question! I dont think I will be able to explain this in a comment. Maybe I will make a separate tutorial about multiple composite components with different orthotropic materials assigned. I will focus more on using the composite browser in that video.
Thanks for pointing this out!
Have you done any linear static analysis of frame structure made of Bamboo/Wood!?
The setup process is similar for every linear static analysis. The only difference is material properties and boundary conditions.
@@Aeroswap I do understand that. I have worked with Hypermesh and LS Dyna as part of my PhD ....I just want to know whether you have carried out or not so that I can learn from you.
Alright! Good to know you have worked with Hypermesh. I do not have any samples ready for wood material. However, if you face any difficulties with your project, feel free to contact me via email.
Sir comoposite analysis in radioss will be a great help to me.
I am working on a composite tutorial in Radioss. It will be released soon.
hi, can we do honey comb modeling in hypermesh to solve in optistruct
Yes, that can be done however you need to link Hypermesh with Altair Multiscale Design Modeler to accurately define the honeycomb material.
@@Aeroswap thank you very much, but how to lose link it
Sorry, how to link it
Sir here you assigned material property (like E value, G value) manually to composite. But suppose i want to make a composite of E-glass+carbon fibre+powdered aluminum oxide using epoxy resin. I don't know the property of composite beforehand.How to make the geometry for the above composite? I am facing difficulties in making the exact composite. Could you help please.
Hello Siddharth, in its standalone state, Hypermesh is not capable of modelling fiber reinforced composites. Only ply-laminate composites are supported. To do this, you have to link Altair 'Multiscale Design Modeller' with Hypermesh.
Did you got any way to solve this problem of yours. I am facing the same difficulty now. How to get the property beforehand for carrying out the analysis
Please help me
I am using HyperWorks 2020 version,
How do I switch to 2D Detailed Representation, and Turn on Composite layers
these options are not available.
From the View panel, go to Hypermesh tools option. Make sure that all tools are enabled. Then the option will show up somewhere in the interface.
@@Aeroswap not able to create ply under laminates
Instead Plies are created in unstacked plies
Right click on the Laminate and create the ply. Then only the created ply will be stored in the laminate. If you click anywhere else in the Composite browser, unstacked ply will be created.
@@Aeroswap under laminate if I right click ...there is no option of create ply
There is duplicate, rename,..... But no option of create ply ....
Is it because I am using students version?
Try using the Model browser of create plies and laminates. Maybe that will work.
Hi can you do video on complex 2d plastic meshing with mid surface also.
Thanks for the suggestion. I will work on this soon!
Hello I am a beginner in Hypermesh, how did you select the base node in graphic view (1:18)? . I am not able to select it kindly help
Hello, can you make a tutorial about wing analysis ? Like how to mesh the spar and ribs, link them with rivet and try to optimize the stucture thanks
Thanks for the suggestion. I will try to work on this idea!
@@Aeroswap thanks, and just one question for you what is the best way to define our 2D elements size in order to have good mesh quality and acceptable simulation time
Hello Harry,
The average mesh size is usually decided as 1/10th of the smallest dimension in the component. This is for straight edges. For curved edges, smaller mesh size must be used to capture the curvature accurately.
@@Aeroswap Thanks, and we can adapt the size if we have different components by geometry. FoR instance one component has the smallest dimension of 1o mm, so we use element size of 1 in 2D mesh.
Moreover if we have an other component which minimun size is 20 mm we can use element size of 2 ?
Best,
Harry
Yes, definitely. That can be done. Just a quick reminder that this is only applicable for nonlinear/linear static analysis and optimization.
For dynamic/transient analysis, it is always preferrable to use a coarse mesh. The time stepping is based on the smallest element length. Using a fine mesh will result in very long solving times. Hence, it is better to use a coarse mesh with simplified geometry when performing dynamic analysis.
Hi Swapnil, I am also using 2021 version of hypermesh, even after following each and every step of this video, i am getting an error "case Control data DLOAD missing in bulk data". what could be the possible mistakes that i might be making ?
Please check the type of loadstep you are using. It has to be 'Nonlinear static' as shown in the video. DLOAD entry is only found in 'Transient' analyis loadsteps and should not cause a problem in static analysis.
If you have other loadsteps in the same model, try to delete them and rerun the analysis.
Let me know if it works!
As of now there is only one load step with type as nonlinear static
So the issue still persists? This should not happen as there is no entry 'DLOAD' in the static loadstep. I never faced this problem. Please make sure that the force load collector is not empty. Sometimes, we forget to change the current collector and the forces do not get stored properly.
Thank you for your response and support, i will set up solver again from start to eliminate any errors. btw Great videos and work , keep it up !
Thanks! Do let me know if you still face the same problem after setting up the analysis again. Feel free to write a mail to discuss in more detail. My contact details are provided in the 'About' section of this channel.