On the Correction by McCiintock and Irwin

In the case of quasi-brittle fracture, at the crack tip there is a small plastic region whose affection cannot be neglected, Therefore the linear elastic asymptotic fields must be corrected, In 1965 F. A. McClintock and G. R. Irwin presented a correction which since then has been adopted extensively, Here in this paper, it must be pointed out that such correction is wrong, A correct result is given.