13th International Conference on Fracture June 16–21, 2013, Beijing, China -5- Figure 4. Three-point test (second set-up) Figure 5. The finite element mesh The fracture resistance in cracked specimens is often described by the values of critical stress intensity factors. The mode-I and mode-II critical stress intensity factors, KIc and KIIc can be written for the SCB specimen in terms of the experimentally obtained fracture load Pcr as: a Rt P K Y cr I I Ic π 2 = (1) a Rt P K Y cr II II IIc π 2 = The fracture load Pcr is obtained for each mode of loading from the maximum load recorded in the fracture tests. YI and YII are mode-I and mode-II geometry factors which were obtained from finite element analyses as 3.73 and 2.25, respectively. The specimen radius and thickness R, t, and the crack
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