Energy release rate of central cracked plate of non-linear elastic material under tension is presented by two terms, describing a crack caused change of energy along edge and central axis of a plate. The first term is a drop of energy along central normal to crack axis of plate caused by crack. The second term is an increased of energy, due to crack, along edge of plate. Relation between these components depending on crack size rate and strain hardening exponent is found, J-estimation scheme for elasto-plastic crack in term of these components was found to be more convenient. An analytical estimation of J-integral for any value of strain hardening exponent, which being in good agreement with finite element results, is carried out.
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