PROBLEM TO BE SOLVED: To provide a crack growth analysis method with which it is possible to maintain analysis accuracy while speeding up analysis.;SOLUTION: A crack growth analysis method has an area division step, a stiffness matrix creation step, an elastoplasticity analysis step, and an elasticity analysis step. The area division step divides the area of an analysis model into an elastoplasticity analysis area in which elastoplasticity is analyzed and an elasticity analysis area in which elasticity is analyzed. The stiffness matrix creation step creates an elastoplasticity matrix in the elastoplasticity analysis area, and creates an elasticity matrix in the elasticity analysis area. The elastoplasticity analysis step calculates the elastoplasticity matrix. The elasticity analysis step makes boundary displacement in the elasticity analysis area matched to boundary displacement in the elastoplasticity analysis area, and then repeatedly calculates the elasticity matrix until a boundary reactive force in the elastoplasticity analysis area matches a boundary reactive force in the elasticity analysis area.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT
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