13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- Figs. 3a and 3b show the normalized TSIFs at the tips of the long and short cracks, respectively, versus nondimensional time τ for a different crack length ratio a2/a1 of 0.6. All other parameters are the same as those in Fig. 2. It is seen that the trend of the TSIF versus time is similar to the case of a2/a1 = 0.2 shown in Figs. 2a and 2b. The peak TSIFs for the long cracks now are lower than those for a2/a1 = 0.2. However, the peak TSIFs for the short cracks are higher than those for a2/a1 = 0.2. The decreased peak TISF for the long cracks and the increased peak TSIFs for the short cracks are the results of enhanced interaction between the long and short cracks as the difference in the crack lengths is now smaller. 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 Nondimensional time Normailized TSIF τa = 0.0 τa = 0.02 τa = 0.05 Figure 3a: Normalized TSIF versus nondimensional time at the tips of the long cracks (a1/b = 0.1, a2/a1 = 0.6, h/b = 1.0, p = 0.5) 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 0.11 Nondimensional time Normailized TSIF τa = 0.0 τa = 0.02 τa = 0.05 Figure 3b: Normalized TSIF versus nondimensional time at the tips of the short cracks (a1/b = 0.1, a2/a1 = 0.6, h/b = 1.0, p = 0.5)
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