13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Figure 7. Relationship between intensity of stress singularity K1φφ and radius of curvature R 3.2. Variation of intensity of stress singularity K1φφ with respect to Young’s modulus of resin Next, in case of computational model, R=3.125μm, relationship between stress distribution and Young’s modulus of resin is investigated. In this section, Young’s modulus of silicon and resin are expressed by E1 and E2. First of all, order of singularity λ is listed in Tab.3. It is seen that order of singularity λ gradually decreases with increasing Young’s modulus of resin E2. Fig.8 shows variation of stress distribution σφφ on silicon surface at angle direction, φ =315°, with respect to Young’s modulus of resin E2. It is found that value of stress σφφ decreases with increasing Young’s modulus of resin E2. In addition, variation of intensity of stress singularity K1φφ with respect to Young’s modulus of resin E2 is shown in Fig.9. It is seen that intensity of stress singularity K1φφ decreases with increasing Young’s modulus of resin E2. Table 3. Order of singularity λ (In case of R=0 model) Young’s modulus of resin E2 (GPa) 0.10 0.50 1.00 5.49 10.00 Order of singularity λ 0.545 0.437 0.429 0.436 0.384
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