Polyurethane Modelling in Samcef

[vinaymadhavan]

I am currently working on a project where I have to model a sheet of al2024 being stretched over a profile made of a polyurethane. I am using Samtech's Samcef Mecano module. The only material properties of the polyurethane that I have are the young's modulus (27 mpa) and the poisson's ratio (0.4). I only need to consider the results related to the aluminuim sheet for my analysis as the only function that the polyurethane serves is as a damper. The thickness of the polyurethane is 20 mm. From what I have read on your website I understand that the best way to model this behaviour is using a viscoelastic or hyperelastic material model but as I am new to these techniques, I was hoping that you could advise me on how to go about doing it. Hope to hear from you.
Rgds
Vinay

[Jorgen]

I think your approach sounds right. I am not familiar with Samcef, but I would start with simple neo-hookean material model for the polyurethane. If the strains are small and you have experimental data for your PU, then you can switch over to a linear viscoelastic model.