dear all

the research of my topic is bond between CFRP bars and concrete, i do the experimental part and i am trying to modelling the bond using beam pull-out test as the picture shows.When I read some article i found that the concrete and the epoxy is defined as damaged but i can't understand how defined the proprety or which tests must be carried out in order to obtain these parameters, and how i can modelling stille hinge.

Can anyone help me please?

thanks