13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Figure 7. (a) Boundary conditions for thermal load, (b) Distribution of the stress component yy in the polycrystal of zirconia with G = 0.8m after a thermal cooling T = -1500 K. Figure 8. Influence of thermal initial stresses on the prediction of the V-KI curves and K0 for Polycrystals of Zirconia with G = 0.8 m, (a) n 0 = 400 MPa, (b) n 0 =900 MPa and (c) n 0 =1150 MPa. Figure 9. Cracks paths for stopped cracks, (a) n 0 = 400 MPa , K0 = 0.063 MPa.m1/2, (b) n 0 =900 MPa, K0 = 1.1 MPa.m1/2 and (c) n 0 =1150 MPa, K0 = 1.42 MPa.m1/2.
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