Greetings.
I am modelling a steel beam (using shell elements) retrofitted with an adhesively bonded FRP plate subjected to web crippling. The adhesive material has been modelled using cohesive elements following traction-separation law. The damage in the material has been defined using QUADS criterion and discretization has been carried out using COH3D8. The cohesive layer is tied to both the steel as well as FRP members. The analysis is performed quasi-statically. Upon analysis, it is expected that the FRP layer will debond from the steel substrate (probably due to the deletion of cohesive elements, element deletion was ON). However, the cohesive elements are found to elongate extensively, even though some element is also observed. How can I achieve a proper debonding phenomenon. I have attached a photo for perusal. Any help will be greatly appreciated.
Prashob P S I have used cohesive material properties based on a hit and trail approach, ranging from 0.1 MPa all the way up to 1000 MPa. But I am still facing the same issue. Can you suggest something based on your expertise?
Mir Basar Suhaib have you provided a slip value (at peak stress) at which damage initiates? Have you provided damage data (based on bond stress vs slip curve)
have u checked with the contact technology? bonding, bonding always, separation... do look into these..
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