stress in concrete01 at high strain

[aslam]

I started my work by modelling a cantilever column with monotonic loading. I developed global response and local response of a system when i developed the stress strain curve for each and every fiber which i model in my system i found at lower value of strain for example 0.002 or less than that stress in concrete is ok but when the strain in concrete is increase let say 0.0025 or 0.003 then the stress which i got were surprised me its 40MPa, i used in my analysis 21MPa concrete and model concrete01. I already check the fiber which i picked its a concrete fiber. Can you explain why its happening.

[vesna]

It can happen only if there is a bug in Concrete01. Are you sure that you are looking at the right fiber?