An error index for the stress intensity factor (SIF) obtained from the finite element analysis (FEA) results using singular elementsis proposed. The index was developed by considering the facts that the analytical function shape of the crack tip displacement isknown and that the SIF can be evaluated from the displacements only. The advantage of the error index is that it has thedimension of the SIF and converges to zero when the actual error of the SIF by displacement correlation technique converges tozero. Numerical examples for some typical crack problems, including a mixed mode crack, whose analytical solutions are known,indicated the validity of the index. The degree of actual SIF error seems to be approximated by the value of the proposed index.
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