symposium 12 - Crack Paths 2021

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Meso-scale modelling of short-crack propagation in fretting fatigue: theoretical analysis and experimental validation
Farshad Abbasi, Mondragon University, Spain
Ewald A. Werner, Technical University of Munich, Germany
Greg Wheatley, James Cook University, Australia
José Alexander Araújo, Universidade de Brasília, Brazil
Keywords: fretting fatigue, short-crack growth, crystal plasticity, microstructure-sensitive models, in-situ techniques
Fretting fatigue is a combined action of fretting and fatigue failures, which occurs when two contacting surfaces are subjected to a lateral contact and an axial cyclic loading at the same time. It has been the subject of numerous investigations over the past few decades and various techniques have been proposed to improve fretting fatigue life. Numerous fracture criteria and multi-axial fatigue models have been suggested to estimate fretting fatigue life and most of the aspects of fretting fatigue mechanisms such as crack initiation location, crack propagation direction and fatigue life have been explored. At present, significantly more attention is being paid to the meso-scale modelling of fretting fatigue short-crack propagation in which the growth of crack depends strongly on local microstructure, and size and crystallographic orientation of individual grains. In the context of experimental studies, various non-destructive testing techniques and in-situ monitoring equipments have been proposed to track grain boundaries, microstructure changes and crack growth within polycrystalline materials.  
The main objective of the proposed symposium is to gather researchers to present current research efforts, exchange recent data and new ideas related to meso-scale modelling of early-stage crack propagation and experimental in-situ techniques (3D X-ray tomography, ultrasound imaging techniques, laser ultrasound, eddy-current and DIC, etc.) to determine crack growth rates and crack paths at the meso-scale.

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