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Adhesion Model – Numerical Methodology

- October 15, 2020 at 4:55 pm
  
  JoanaAzevedo
  Subscriber
  
  Hello!
  I am studying an adhesion model between galvanized steel and concrete. The model consists of a galvanized steel tube (internally filled with concrete) and a concrete cube.
- October 29, 2020 at 4:11 pm
  
  Bhargava Sista
  Ansys Employee
  
  Based on the description, CZM seems to be the best option. In Engineering Data, you can create a debonding based CZM model and in Ansys Mechanical you can use a Bonded contact between the two surfaces. Then insert Fracture and under fracture you can define CZM based debonding.
  Frictional or rough contact wouldn't work as you need a lot of contact pressure generated between the two parts for friction to support the pushout force.
- November 2, 2020 at 5:52 pm
  
  JoanaAzevedo
  Subscriber
  
  .
  Hello!
  I started by using the CZM method, with the option of Fracture-Energies based debonding (attached image). The image values are my experimental values.
  Then in the Model I added the fracture and then the Contact debonding (which only works with Bonded and separation contacts).
  When in the contact between the galvanized steel tube and the concrete cube I place “Bonded” the software runs and gives results (not the intended one) and when I place “No separation” the software doesn't even run, an error appears (next image).
  I was only able to resolve the error by using a very high value for the Critical Fracture Energy (1e + 14 j / m2) and the strength results are much lower than the experimental ones (around 55KN).Next image.
  I don't know if any of the steps described are wrong.
  Thanks.
  .
- June 29, 2021 at 7:42 pm
  
  JoanaGoncalves
  Subscriber
  
  .
  Hello!
  Initially only with the CZM, the model ran to the peak and then an error appeared saying that the model did not converge.
  
  Then I tried to implement the commands (https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v194/ans_ctec/ctec_czmhealing.html?q=czm) ) in the adhesion contact zone simultaneously with the CZM).
  What happens next is that there is a post-peak response, but as you can see from the chart, it's still far from what I want. Can you help me please? Thanks!
  Best regards
  Joana Gonçalves
  .

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