13th International Conference on Fracture June 16–21, 2013, Beijing, China -3- grows whilst the un-cracked block remains unchanged. X Y Z CRACKED BLOCK UNCRACKED BLOCK Figure 2. Type mesh configuration for stress intensity factor estimation Local fatigue crack growth increments were calculated using the equation mentioned above, and a new crack front was established by fitting a cubic spline curve to the positions of the advanced corner nodes. Along the spline curve new corner and midside nodes were then relocated with them distanced properly. This method has been verified to be effective [6]. Automatic re-meshing of the FE model is part of the simulation technique, which makes the step-by-step simulation possible. More details can be found in [4, 6]. 3. Analysis examples Six different stress distributions varying along the plate thickness direction, as shown in Fig. 3, are considered in the present investigation. They are applied to the surface crack face in the plate as the maximum fatigue load. The minimum fatigue load is assumed to be zero. Figure 3. Crack face stresses considered in the investigation CASE I CASE V CASE II CASE IV CASE III CASE VI crack
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