Abstract
In many cases the lifetime of technical structures and components is depending on the behaviour of cracks. Due to the complex geometry and loading situation in real-world structures cracks are often subjected to a superposition of normal, in-plane and out-of-plane loading. Therefore, in order to construct reliable structures, it is necessary to have criteria for predicting the beginning of stable and unstable crack growth as well as the crack growth direction. In this paper, different criteria for 3D crack growth under multiaxial loading, that means superposition of the fracture modes Mode I, II and III, are described and the results are compared. New approximation functions for the description of the three-dimensional crack deflection are proposed.
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