13th International Conference on Fracture June 16–21, 2013, Beijing, China -6- A25 c c K Kσ σ and 2t . The A25 c c K Kσ σ values are distributed near the solid line within about 10% error. Figure 13 shows the A25 c c K Kσ σ values. The average of A25 c c K Kσ σ values was about 0.997. The A25 c c K Kσ σ values are distributed near the solid line within about 10% error independent of the l2 and t2. It is concluded that the debonding criterion for all types of SLJs having different adhesive thickness and overlap length can be described by the critical intensity of singular stress field Kσ c = constant. 5. Conclusion In this study, the debonding fracture criterion for the SLJ having various adhesive length and overlap length was examined. It is found that the singular stress field at the edge corner can be expressed with the same formula even if the adhesive length and overlap length are different. Then when the overlap length is short enough, the fracture criterion can be expressed with the average shear stress at the fracture; when the overlap length is longer than a certain length, the criterion can be expressed with the critical intensity of the singular stress field. Figure 9 Relationship between 1 A25 1 = = P P K Kσ σ and 2l when P = 1N Figure 10 Relationship between A25 c c K Kσ σ and 2l Figure 11 Relationship between 1 A25 1 = = P P K Kσ σ and 2t when P = 1N Figure 12 Relationship between A25 c c K Kσ σ and 2t
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