13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- 3. Numerical analysis 3.1. The model of the numerical simulation The stress strain field around the holes in the test sample is obtained by means of the elastic plastic finite element analysis. In this simulation, the numerical modal is the same as that in the fatigue test in shape and size. The mechanical properties of the material are the same as in the test. The stress strain curve of the material is shown in Figure 9. Different in the fatigue loading in the test, during the numerical simulation, a constant value of load is applied as the boundary condition for the numerical model. Thus the stress strain field obtained from the numerical simulation is the peak value stress strain field of the fatigue loading. Fig.4, the second crack initiates from the inner edge of the hole in one sample Fig.5, the inner edge cracks link each other and induce the two holes connected
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