13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- 0 2 4 6 8 10 12 0 0.5 1 1.5 2 tVs/c K θθ (t) θ=0 θ=20 θ=50 -180 -150 -100 -50 0 50 100 150 180 0 0.5 1 1.5 2 θ (degrees) K θθ (max) h1/c=1, h2/c=5 h1/c=5, h2/c=1 h1/c=h2/c=3 h1/c=h2/c=Inf. possible crack kinking direction is oriented toward the thinner side of the strip. This is in agreement with [16] and [8] for the static mixed mode crack problem. It also agrees with the physical phenomenon that surface cracking is more likely to happen, due to the mechanism the crack kinks into the direction toward the surface of the body. The maximum value of the HSIFs appear at the angle 0=θ in the symmetric case when 2 1h h = , which implies that the crack may propagate along the extension of original crack plane. Figure 2. Dynamic hoop stress intensity factors for different angles when 1 0.5, 1 = =+ h c LD and 5 2 = h c Figure 3. Maximum values of the normalized hoop stress intensity factors versus angles when 0.5 =+ DL
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