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how to plot traction vs separation for CZM in Abaqus

Dear All,

Can anyone tell me that how I can plot the traction-separation for cohesive surface in Abaqus? In XY data, I defined reaction force and displacement and then combine them but the plot was not like the one we have in manual. 

Do I specify RF and U for interaction surface? Do I select just one node or the whole model for RF and U?

Thank you,

 

I could be completely wrong here and I invite anyone to correct me if I'm wrong but I see a flaw in what you're expecting and what you're trying to do.

My assumption is that you're looking for the traction-separation 'law' that you apply to your cohesive zone. But what you're measuring is the reaction forces used to detach the geometric surface. The traction separation 'law' is defined by your cohesive zone simulation and that's an input to your CZ model. If you're using ABAQUS's inbuilt CZM, then you're by default using a bilinear traction separation law. If you want to change this behaviour you would likely have to write a UMAT for it (for example creating more complicated traction separation curves such as  Dr. Ghosh's works at John Hopkins and Dr. Roy's at University of Alabama ). Now what you're measuring is reaction forces at constrained nodal points applied for your geometry to separate GIVEN this particular traction separation law. Completely different measurements. My guess is if you defined a two element system, a very simplistic system, these two cases might coincide but I am not very sure. A hand calculation of a simple model would actually give you a better result to tell you the truth.

Hopefully that made sense,

Ashwin 

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