Performing Curve Fitting for Hyperelastic Models Using Ansys Mechanical - Lesson 1

[@AnsysLearning]

This video is part of the free Ansys Innovation Course, “Topics in Hyperelasticity”. Access all of the course contents, including additional lessons, handouts, simulation examples with starting files, homework problems, and quizzes: courses.ansys.com/index.php/courses/topics-in-hyperelasticity-using-ansys-mechanical/

[@dirkb.7307]

Awesome explaination!

[@muhammadhizbullah1008]

Thank you for the informative video.

[@asifraj321]

Thanks for such a nice explanation. Definitely it helps us.

[@alejandroruizmartin-bt5md]

Hello, I have done the same procedure for a compression test and the results are not as expected. Could you give me instructions to enter the compression data in ANSYS and the boundary conditions? Thanks..

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@mohsenhatami3499]

very nice explanation.

[@alejandroruizmartin-bt5md]

Thanks for the video, congratulations on your work. A question: Could you also convert the engineering stresses to real ones at first and compare the simulation with the Von Mises results provided by ANSYS? Thanks!!😃

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@mohsenhatami3499]

Thanks alot for this helpful video.

[@MrOmi90]

can someone explain what the residual value describes that i recieve when performing curve fitting? i want to describe the quality of the fitting. is there any option for that?

[@СергейМММ-ь5д]

Thank you for the video. But I can’t figure out where to take into account the compressibility of the material? At what stage and where? Thank you

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@ameypatil2199]

NICE EXPLAINATION, CAN YOU PLS TELL ME FOR WHICH ELASTOMER THIS DATA IS ?

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@hongjiangliu7434]

Thanks for your video. My question is how to measure the biaxiable data for curve fitting?

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@sunalijaish8869]

Thanks for this insightful video! can you let us know how to export the curve fitted data from ansys?

[@AnsysLearning]

Glad you liked the video! Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@sunalijaish8869]

@@AnsysLearning Thanks for your reply. its been so long now, but I am not able to find any option for exporting data after performing curve fitting. Please help.

[@ruizxzx]

im a sixteen year old computer science student out physics teacher gave this project for our finals in practical and this is so complicated

[@AnsysLearning]

Thanks for watching!

[@juanibiris2]

Thanks for the video! It has been really useful for me to define and calibrate polymer materials. The only thing i think it's wrong is that in the last comparison between experiment data and simulated data, you are comparing forces with stresses and as expected cross section is changing throughout the experiment, then it may not be comparable, right? thanks anyway, very nice job.

[@AnsysLearning]

Thank you for your comment, we're glad that you liked it. Regarding your note, in the video we only compare the numerical values of the force-displacement curve with the engineering stress and engineering strain. The engineering stress is calculated with respect to the undeformed configuration (change in the area of cross section is not taken into account) which is why we compare against it. Also, they have same numerical values due to the unit dimensions of the cube. Please refer to the video from time stamp 12:32, we provide an explanation in more detail. I hope this helps!

[@vmmramos]

How to setup based on load from an outside force?

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@Time-Lapseyp4mo]

Thanks for the video it really helps me understand how to preform the curve fitting ! I have question to ask, I am trying to simulate Dielectric Elastomer Actuator, and I already defined my material using the curve fitting tool in ANSYS. But, now I want to apply cyclic loading in terms of (voltages and frequencies) to my Dielectric Elastomer Actuator and find the deformation of the Elastomer. Frankly, I really do not know how I can do this simulation I can not find any references or tutorials. If you can help me with anything will be much appreciated. Thank you again!

[@AnsysLearning]

Thanks for watching! The Ansys Learning Forum is a great place to get guidance and answers to questions just like these. Visit today at www.ansys.com/forum.

[@Time-Lapseyp4mo]

@@AnsysLearning Thank you for your reply! I am actually a member in Ansys Forum and I searched for anything that is related to simulation of dielectric elastomer but I could not find any. Because, as I know that simulation of dielectric elastomer is complicated and it requires iterations between two physics fields for convergence. And I really can’t find any thing that can help me what to do and if it is really possible to preform such a simulation in Ansys. Your help is highly appreciated!

[@AnsysLearning]

@@Time-Lapseyp4mo You have a great question regarding modeling dielectric elastomer! Please post these questions on the Ansys Learning Forum and our engineers will guide you on these convergence issues related to your simulation.

[@Time-Lapseyp4mo]

Ansys Learning Thank you! sure I will post and hope I can get an answer to my issue

[@sharifshabani6616]

thanks, it was very helpful for me

[@msreeabeyvignesh8254]

can anybody tell me how lamas first and second parameter can be calculated from stress strain data

[@AnsysLearning]

Thanks for watching! Please visit our Ansys Learning Forum where one of our technical experts can answer your question. Visit at www.ansys.com/forum.

[@msreeabeyvignesh8254]

@@AnsysLearning sir can you tell me one thing that is only uniaxial data is sufficient for finding C1 C2 and c3

[@mohamedenn2096]

Can you share the dataset with me please?

[@AnsysLearning]

Thanks for watching! Please post your query on the Ansys Learning Forum for a detailed answer from the wider Ansys Community: ansys.com/forum.

[@DennisZIyanChen]

Isn't it just sad that a really well organized video like this one only has 341 views but stupid garbage out there with people acting like idiots have hundreds of millions of views. The only thing I would add to this one is use frictionless support to lock the three faces during the single element study. That's something that your very own folks at CAEI pointed out to me. Secondly, one should talk about the potential of adding a little bit incompressibility or talk about how to modify element formulation to U-P. These are all necessary things to learn to be able to run this realistically.