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Fractional derivatives model for viscoelastic material in COMSOL
Posted 16.02.2023, 19:26 GMT-5 Materials, Equation-Based Modeling 1 Reply
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Hello
I want to model a viscoelastic material in COMSOL, so I drew a block and selected a material from the software library (polyisobutylene). Then, after choosing "solid mechanics", I added a hyperelastic material so that I could select the "viscoelasticity" option.
In the "viscoelasticity" tab there's a section called "material model", which allows the following options: Maxwell generalization, standard linear solid, Kelvin-Voigt.
The thing is that I don't want to use any of those models but the fractional derivatives model, which you can see in the attached figures. What should I do?
Thank you
https://ibb.co/sqW6m3T https://ibb.co/9vMtPpJ https://ibb.co/B30wCWw https://ibb.co/RpcLRRW https://ibb.co/mGnx789
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Fractional derivatives in COMSOL are so far only supported for frequency domain analysis, that is a linear type of study. That is why they only exist for Viscoelasticity under the Linear Elastic Material node. For infinitesimal strains, there is no need to use an hyperelastic material.
-------------------Henrik Sönnerlind
COMSOL