13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- boundary condition is defined as Table 3. The disturbance of Table 2- Case 2 is used in this section. All the models of different heights are assigned with the same disturbance. Table 3. Boundary condition of models with different sizes Height of the model (mm) Initial tension displacement (mm) Loading rate (mm/s) 80 0.15 252 160 0.3 504 320 0.6 1008 (a). Model of 80mm height without (upper) and with disturbance (lower) (b). Model of 160mm height without (upper) and with disturbance (lower) (c). Model of 320mm height without (upper) and with disturbance (lower) 0 t s 10 t s 20 t s 40 t s Figure 7. The crack path comparison between models with different model height Fig. 7 shows that the crack path distributions of all the samples without disturbance are anti-symmetric, which are similar to the analytical solution of ideal homogeneous models [14]. Also, these results indicate that the effect of the local heterogeneity generated by these mesh settings can be ignored. As the model size becomes bigger, the difference between models with and without disturbance becomes smaller. For example, the crack path of model of 80mm height with disturbance has one main crack path develop horizontally to the model boundary, the anti-symmetry
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