13th International Conference on Fracture June 16–21, 2013, Beijing, China 3.2 Mixed mode crack propagation on a multi-perforated sample structure This last example highlights the robustness of the method to deal with a very complex crack propagation simulation. The multiperforated sample geometry has been obtained from the Inria geometry database1, the unit length size and the coordinate system used to describe boundary conditions refer to the downloaded geometry. The mechanical behavior is assumed to be isotropic linear elastic (E=210 000MPa as Young modulus and =0.3 as Poisson coefficient) under small deformations. The boundary conditions are: a prescribed null displacement in all directions on the bottom face (z=-50), vertical displacement Uz=1 and sheer displacement Uy=-2 on the top face (z=50). A fatigue loading is imposed with a simple [0 → 1 → 0 ] loading cycle. A Paris law is used with a m=3 exponent on the K equivalent mode I stress intensity factor. The initial crack is a 1. radius disc with a (50.0000 1.79113 -8.14958) center position and a vertical normal direction (0. 0. 1.). Figure 7. Crack propagation on a multiperforated structure under mixed mode fatigue loading. 1 To be downloaded at: http://www-roc.inria.fr/gamma/download/affichage.php?dir=DREXEL\&name=drxl\_cheese2\&last\_page=30 -8-
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