I m checking stress-strain curve of the default NL concrete model (Drucker Prager with tensile pressure failure criteria), and got following stress-strain curve for concrete (picture attached). I m using default parameters of the concrete model and got the curve using 50 mm cube. I want to know that why the stress-strain curve is not according to reality?
The conventional stress-strain curve found in the literature is much different than obtained from this model.
anyone, please guide me for possible reasons.