Dear Samaaneh,

I have been studying this subject for a wile and I hope to contribute positively for your study. However, please note that I am not an ABAQUS user but I also think that this is only a question of how to introduce the data into the FE code.

Generally, what we usually do is to assume a cohesive model to represent the FRP-to-parent material interface and for that we use local and nonlinear bond-slip (fracture mode II) curves that agree with the experiments. Moreover, the local nonlinear bond-slip curve can be obtained from your experimental load-slip curve and for that my advice is to seek for the proposal made by Dai and his advisor professor Ueda from Japan. So, before you try to introduce the data in ABAQUS you should know if you may assume such local curves in your model.

There are other FE codes that simulates interface according to e.g. the Mohr-Coulomb rupture criterion. For that, you should define the interface cohesion that you may set equal to the maximum bond stress of the interface, the dry friction angle of the interface and finally you also have to set the softening curves for fracture modes I and II. The latter may represent an additional task that is more difficult to solve. However, for a first approximation you may see some work that I have been developed recently and try my values for GFRP and concrete. I tried those values with CFRP and concrete and the results were accurate with my experiments. I have other results with CFRP and concrete but they are not yet available in literature but I may help you on that by advising for the values that you should use in your formulations.

In the final your experimental load-slip curve should be well simulated when you assume all the right values for the complete definition of the interface elements. Hope to be useful.

Greetings,

HB

Thank Dr.  Biscaia

amazing ,,, I'll check those references that you mentioned, and looking to get right way

and sure I'll tell you with my results to have feedback

Thank you