13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- postponed obviously with the increasing of crack length. This may partly due to the dispersion of the stress wave around the impact region edge. Fig. 8 Peak values of normalized strain energy release rate versus crack length Anyway, these results in Fig. 8 indicated that the strain release rate is not altered by the in-plane residual stress in the film. Moreover, the interface stresses are neither influenced by the residual stress, as shown in Figs.9 and 10. However, the film stress will be greatly dependent on the residual stress states, which can be found in Fig. 11. A high degree of similarity of the three curves corresponding to the three initial stress states is also in the nature of things considering the ideal elasticity consumption adopted in this model. Fig. 9 Normal stress acting at the outer node close to the interface crack tip for the three initial states
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