13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- a) b) c) Figure 3. Aluminum alloy specimens with special rolling direction: a) in crack direction, b) diagonal, c) perpendicular to the crack direction These results lead to the knowledge that the presented concepts are able to predict the crack growth behavior very well as long as the structure is a homogeneous and isotropic one. For the description of materials with a graded property, for example in form of the shown predominant direction, other concepts have to be used considering the influence of the material gradation. Therefore hypotheses describing Mixed Mode crack growth in graded materials are presented in the following contribution. Figure 4. Kinking angle from criteria in comparison to experimental data of a rolled aluminium alloy specimens for 2D Mixed Mode cracks 3. Crack growth in functional graded materials In technical practice innovative manufacturing and application-oriented products, considering lightweight construction, gain increasingly in importance. In this context functional graded materials and structures take a special position. Due to the fact that these materials possess an application matched functional gradation they are able to meet different local demands such as
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