November 12, 2022 at 7:04 pmLovisa SvanborgSubscriber
November 16, 2022 at 4:53 pmMike RifeAnsys Employee
Hi Lovisa Svanborg
I think you answered your own question. The material model is not stable as the uniaxial response turns negative at strain ~0.125 and would likely have solution difficulty before that. But, do you expect uniaxial strains larger than say 0.05? If not then you could probably use this fit. Otherwise I'd redo the fit changing the options...maybe use a different hyperelastic material model.
November 17, 2022 at 12:43 pmSaiDAnsys Employee
You may find this video helpful: How to Perform Curve-fitting for Hyperelastic Material Models — Lesson 1 - ANSYS Innovation Courses
Watch the video at around 3:10. If you only have Biaxial data, then material response in only that mode of deformation may be considered reliable. Material response in other modes may not be as reliable. So if your model deforms only in the biaxial load, this data set might be sufficient. But if it deforms in other modes, you need more data to caliberate your hyperelastic material model and to get sufficiently reliable results in your simulation.
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