Single parameter formulations have shown to be insufficient to describe constraint effects in fracture mechanics specimens. This has lead researchers to a two parameter approach like the J-Q theory. In order to investigate constraint effects, the authors have developed a generic finite element model. Prior to drawing conclusions this model must first be validated, which is the topic of this paper. This validation has been done by comparing analytical expressions of the J-integral with those obtained from the performed simulations. The compared geometries were center cracked tension (CCT) and double edge notched tension (DENT) fracture mechanics specimens. The results showed good agreement with the analytical expressions and, as such, the model can now be confidently applied to determine values of the J-integral. This is a first step towards evaluating two parameter J-Q constraint
