Dear Esteemed Eng-tippers
I'm trying to model a device made of stiff, nonlinear elastic filaments wound around a mandrel, then potted in epoxy. I blithely assumed that this would be a doddle, using one of the dozens of Ansys material models, but I'm actually struggling to find an appropriate one. 'ANISO' seemed to be the nearest, but is restricted to a bilinear material model, whereas my material is better described by a stress-strain curve that continuously bends, getting less and less stiff the more it is strained. I would also like to include the effect that the material has very low strength in the tensile radial direction - ie, layer to layer strength is very low.
Does anyone have any suggestions? I'm seriously thinking of modelling each fibre at the moment, which is embarrassing.
Thanks in advance,
Tony
I'm trying to model a device made of stiff, nonlinear elastic filaments wound around a mandrel, then potted in epoxy. I blithely assumed that this would be a doddle, using one of the dozens of Ansys material models, but I'm actually struggling to find an appropriate one. 'ANISO' seemed to be the nearest, but is restricted to a bilinear material model, whereas my material is better described by a stress-strain curve that continuously bends, getting less and less stiff the more it is strained. I would also like to include the effect that the material has very low strength in the tensile radial direction - ie, layer to layer strength is very low.
Does anyone have any suggestions? I'm seriously thinking of modelling each fibre at the moment, which is embarrassing.
Thanks in advance,
Tony
