I am attempting to define a suitable material property for FRP laminates as to use them for my FE modeling of reinforced concrete structures.
I have used solid65 element for the concrete and I have achieved a nice agreement based on the experimental data. I use solid46 element for FRP composites as different layers with different material properties are available in each direction.
my problem is to define a material model in which the tensile stress-strain curve is different for each direction as well as compression and tension. the software offers a material model named "Generalized Anisotropic Hill Potential" in which everything I want is provided but the problem is that when I define different tensile and compression yield stress/strain, it generates some consistency problems.
I think this happens because of my linear material basis. in this case I need to define a linear material with different Elastic modulus and poisson's ratio for tension and compression first which i don't know how to deal with it!
please discuss your experience with me