Statistical Simulation of Biaxial Fatigue Behaviour Affected by Microstructure

Abstract eng:
In this work, a modelling procedure was developed so that it should be applicable to the analysis of crack growth in materials with various microstructures under biaxial fatigue. Microstructures of two different polycrystalline materials were modelled by using Voronoi-polygons as grains. Then, the crack initiation was analysed as the slip plane separation in an individual grain, and the number of cycles required for the separation was calculated by using a dislocation pile-up model. In the crack propagation stage, the crack growth was analysed as a competition between the grth by crack coalescence during crack initiation and propagation stages and the propagation of a dominant crack as a single crack. Cracking morphologies and failure lives simulated by using the proposed model were compared with experimental results, and it was found that good correspondences were seen between them.

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