13th International Conference on Fracture June 16–21, 2013, Beijing, China -7- Figure 4. SIF KI calculated for crack approaching interface and SIF KI calculated for crack propagating straight in the second material. Laminate body was subjected to the thermal load ΔT=-1230°C. SIF KI evaluated using ANSYS function KCALC. Figure 5. ERR GI calculated for crack approaching interface and ERR GI calculated for crack propagating straight in the second material. Laminate body was subjected to the thermal load ΔT=-1230°C. ERR Gr evaluated using the ANSYS function CINT (J-integral). The values of the GSIFs characterizing the stress state at the crack tip for crack terminating at the interface of ATZ and AMZ layer are listed in Table 3. The GSIF for mechanical loading is calculated for a loading force of 10N. For higher forces it can be easily recalculated (due to its linear dependence on the applied load). GC(AMZ)= 23J/m2 GC(ATZ)=25J/m2 l0 l0 ATZ AMZ VATZ/VAMZ=2 VATZ/VAMZ=5 VATZ/VAMZ=8 Interface Crack extension length in front of (behind) interface [μm] ERR GI [J/m2] ATZ AMZ ap ap ATZ AMZ ERR GI – FEM (J-integral) GC(ATZ) GC(AMZ) KIC(AMZ)=2.6 MPa.m1/2 KIC(ATZ)=3.2 MPa.m1/2 l0 l0 ATZ AMZ VATZ/VAMZ=2 VATZ/VAMZ=5 VATZ/VAMZ=8 Interface Hr Crack extension length in front of (behind) interface [μm] SIF KI [MPa.m0.5] ATZ AMZ Hr SIF KI r – FEM (KCALC) KIC(ATZ) KIC(AMZ) ap ap ATZ AMZ Hr
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