13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- (a) constant 2 = t condition (b) constant 2 = l condition Figure 2 Experimental adhesive strength Pa f 10) Figure 3 Average shear stress at fracture of specimens with t2 = 0.15 mm 10) 3. Analysis 3.1. Analysis model and method Figure 4 shows the schematic illustration of the analysis model. Dundurs’ parameters at point O are α = -0.8699 and β = -0.06642. The order of stress singularity is two different real values λ1 = 0.6062 and λ2 = 0.9989. When the eigenvalue equation has two different real roots, the stresses at a distance r on the interface from the corner edge O can be expressed as follows. 2 1 1 2 1 1 λ σ λ σ σ − − = + r K r K y , 2 1 1 2 1 1 λ τ λ τ τ − − = + r K r K x y (1) Here, σy is the stress in the y direction, τxy is the shear stress. In this analysis, the method proposed by Noda et al [13] is used. In this analysis, the elements near the edge corners of all models were set so as to be same size and shape. And then, minimum size of the element at the edge corner, emin, is changed, the influence of the mesh pattern on the stress distribution is investigated. The emin value is set to 3 -8, 3-9, 3-10 and 3-11.
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