ICF13B

13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- Figure 3. Image analysis measurement method for crack opening contour To investigate delamination behavior, etch the specimen when am reaches nearly 12mm, 17mm and 22mm. Through image analysis measurement method, acquired delamination shape and size finally, as shown in Fig. 4. Figure 4. Image analysis measurement method for delamination shape and size after etching 2. Results and Analysis 2.1. Crack opening contour Experimental data and fit curves are shown in Fig. 5. The direction of axis x represents the direction of crack propagation and the zero point in axis x is the location of the saw-cut tip. 0 4 8 1216202428 0.00 0.05 0.10 0.15 0.20 am: about 17mm COD/mm x/mm am: about 22mm Fit Curves 2as=10mm R=0.1 σmax=60MPa am: about 12mm 0 2 4 6 8 101214161820 0.00 0.05 0.10 0.15 0.20 a m: about 12mm COD/mm x/mm 2as=10mm R=0.1 σmax=85MPa am: about 17mm Fit Curves (a) (b)

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