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Modelling and simulation of fatigue crack initiation in metallic joints based on crystal plasticity

: Beckmann, C.; Farajian, M.; Siegele, D.; Hohe, J.

Fulltext ()

Letters in applied nanobioscience. Online journal 5 (2016), No.2, pp.354-357
ISSN: 2284-6808
Bundesministerium für Wirtschaft und Technologie BMWi
17.520N; IBESS
Mikrostrukturbasierte Beschreibung der Entstehung von Rissen an Defekten in Schweißverbindungen
Journal Article, Electronic Publication
Fraunhofer IWM ()
Fatigue Crack; Incipient Crack; Welded Joint; Polycrystalline Microstructure Model; Probabilistic Analysis

In the present study a numerical model to simulate the initiation growth of fatigue cracks in welded joints is shown. The developed model is based on a polycrystalline microstructure with potential slip bands whose directions are dependent on the grain orientations. Considering transgranular crack growth, the crack propagation direction at the grain boundaries is determined by the potential slip directions in the neighboring grain and an energy-based criterion. Subsequently, a statistic analysis of different computed crack path provides a distribution of the number of cycles upto a pre-defined crack length which is as an incipient crack important for many fracture mechanics evaluation concepts.