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Interface Crack Propagation in Abaqus, using Cohesive Interaction

Hi

 

I am trying to model interface crack propagation in Abaqus using Cohesive Interaction (default module in Abaqus). My model consists of two rectangular domains attached to each other by the longer edge. I am defining two surfaces on each of these domains and defining traction separation laws for these surfaces. There is a small portion in the middle for which I am not defining any traction separation law (thereby making it my notch). I am then applying displacement controlled loading on the remaining two longer edges. I am having two set of problems:

 

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