抄録
This paper describes the analysis of J-integrals and increment of J. The J and ⊿J for the plate with a central crack is analyzed by using path integration based on the numerical results of FEM analysis. The J-integrals are calculated by both elastic analysis and plastic analysis. The results are compared between elastic analysis and plastic analysis, and ⊿J under the cyclic loading is investigated and compared with the simplified analysis method.
