Textural Fractography of Fatigue Fractures

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F09%3A00160395" target="_blank" >RIV/68407700:21340/09:00160395 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Textural Fractography of Fatigue Fractures
Original language description
Within conventional fractography, the reconstitution of the history of a fatigue crack growth is based on striations and/or beach lines. As an alternative, image textural analysis is applied. SEM magnifications from 30 to 500x are used. Six methods havebeen developed: application of 2D Fourier and 2D Wavelet transformations, fractal analysis, Gibbs random field model, idealization of light objects into a fiber structure, and auto-shape decomposition. Images are characterized by image feature vector, from which crack growth rates (CGR) are expressed by means of a multivariate statistical model or a neural network. Under variable cycle loadings, the conventional definition of CGR is fractographicly confusing. A new concept of reference crack growth rate(RCGR) covers all fatigue cracks regardless of the type of loading. RCGR may be estimated directly from images of fracture surfaces, or from a cycle-by-cycle crack growth model. Several applications on real data are presented.
Czech name
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Czech description
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Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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