Hello everyone,
I am trying to model a DCB (mode-1) test for a carbon-fiber composite sample. However, I am a bit confused since I am very new to modelling and ABAQUS so I am looking for some help.
For composite structures, it is said that cohesive zone method is one of the best choice to model the initial crack area but in our experiments, we used a teflon film as crack initiator. That's why I am a bit confused. How could I model this teflon film in ABAQUS? Should I model it as a cohesive element with some values that I found on literature ? Does the element/material of the crack area has an effect on results ?
Any help would be appreciated. Thank you very much.
Dear Göktuğ Kılıç
The literature may be useful to you
https://www.researchgate.net/post/DCB_Double_Cantilever_Beam_test_in_ABAQUS_for_Mode_1_fracture_using_cohesive_element-can_anyone_help
https://www.youtube.com/watch?v=nMH7ETl4ptk
Hi Göktuğ Kılıç
The Teflon film is used to prevent two surfaces from sticking together during the manufacturing of the composite, creating a 'slit' like crack. In the model, you do not need to model the teflon strip. I am sure you can assume that the 'slit' have no radius for simplicity purposes, and if the composite is polymer based it will be more than sufficient.
Hope it helps. You can always model both cases to compare the output.
Regards,
W
Weeliam Khor Thank you so much. So how could I determine the cohesive zone properties to input to Abaqus? Do you haber any idea on that?
Göktuğ Kılıç
Check out this paper, you will get some idea about what is CZM elements.
The Cohesive Zone Model for Fatigue Crack Growth - Jinxiang Liu, Jun Li, Bo Wu, 2013 (sagepub.com)
https://doi.org/10.1155%2F2013%2F737392
Regards,
W
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