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Debonding simulation - XFEM fracture criterion - delamination


I am using Abaqus/CAE 6.10 to simulate a Debonding test (cohesive behavior for composite delamination). 

I ran a Abaqus debonding simulation example (from Abaqus online documentation - Abaqus Benchmark Manual - 2.7.1 Delamination analysis of laminated composites).

The Abaqus/Explicit three-dimensional model with surface-based traction-separation behavior used a surface contact interaction property with:

- default Cohesive behavior

- XFEM-based LEFM (using VCCT) fracture criterion.

The following ERROR message appeared after submiting the job:

"The direction parameter is not available for *fracture criterion with surface-based cohesive behavior."

I tried to run the model without the XFEM fracture criterion and it went allright.

Do anyone knows why can't I apply this fracture criterion in this DCB test?

Thank you for your time and attention.

Best regards,

David Melo - PORTUGAL

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