Multiscale fatigue crack initiation and propagation in engineering materials: Structural integrity and microstructural worthiness. Fatigue crack growth behaviour of small and large bodies
type: Item
instance of: scholarly article
title: Multiscale fatigue crack initiation and propagation in engineering materials: Structural integrity and microstructural worthiness. Fatigue crack growth behaviour of small and large bodies
zbMATH Open document ID: 1149.74005
published in: Solid Mechanics and Its Applications
publication date: 2008-06-24T00:00:00Z
review text: Earlier fatigue crack growth models assumed functional dependence on the maximum stress and on the size of the pre-existing crack or defect. Various possibilities were examined in the hope that the data could be grouped such that linear interpolation would apply. The idea of associating fatigue test data with design was made when the data led to the straight line relationship with the range of mode I stress intensity factor on a log-log plot. The \(y\)-intercept and slope of this line were found by curve fitting and considered to be material specific even though they also depend on the specimen size. Wide acceptance of this approach was soon adopted due to the simplicity of integrating the two-parameter relation for determining the critical crack length for different specimen configuration. Moreover, the stage of slow and stable crack growth was able to be delineated from the onset of the unstable and rapid crack propagation. Even at this date efforts are being made to better understood the physical meaning of the crack growth rate data outside the range of the two-parameter straight line zone referred to as region II. Region I and region III are associated, respectively, with fatigue crack initiation and fast crack propagation, not to mention the two transitional zones where region II connects with region I and III. Despite the exhaustive undertakings to examine microphotographs, the phenomenon of multiscale fatigue crack growth remains elusive. One of the main objectives of this book is to examine size-scale dependent microstructure evolution of fatigue damage affiliated with small specimens ranging from micrometer to nanometer. These details enhance the understanding of small scale fatigue damage mechanisms. The scale of investigation is also expanded by several orders of magnitude to include slip mismatch due to differences in grain size, orientation, micro-texture, etc. which arise because of the irregular propagation of short cracks. The fatigue damage map met…
reviewed by: Răzvan Răducanu
Mathematics Subject Classification ID: 74-06
Mathematics Subject Classification ID: 74Rxx
Mathematics Subject Classification ID: 00B15
zbMATH DE Number: 5292462
MaRDI profile type: Publication
description: scientific article; zbMATH DE number 5292462