How to know cohesive debond or not ?

[Bigtree]

Hi, I used cohesive element to modle sepatation.And, how could we know it debonded or not?

 

[xerf]

By ckecking the displacements of the nodes of the cohesive elements ???

Technically the cohesive elements do not separate, they just deform according to a traction-displacement law (a.k.a. traction-separation law, a.k.a cohesive law).

In general, the separation of the cohesive elements is a continuous process, and it is implemented through a reduction of their stiffness, mimicking damage and failure.

 

[xerf]

Some output variables that can be requested in context of
cohesive elements can be found here:

ABAQUS Analysis User's Manual ->

18.5.6 Defining the constitutive response of cohesive elements using a traction-separation description