Multiscale characterization of pitting corrosion and application to an aluminum alloy
Φόρτωση...
Ημερομηνία
Συγγραφείς
Frantziskonis, G. N.
Simon, L. B.
Woo, J.
Matikas, T. E.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
European Journal of Mechanics a-Solids
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
This paper documents a novel method for characterizing pitting corrosion damage in structural materials such as Al 2024-T3. Specimens of such alloys are corroded in a controlled environment and the pits' geometry is captured digitally using white light interference microscopy. The digital data are then processed with wavelet-based analysis, thus making possible a multi-resolution description of the geometrical features. The analysis reveals several interesting features of the pits that are similar for all the experimental data analyzed herein, and independent of the process followed for creating them (time the material is exposed to corroding environment, concentration of the corroding agent, surface area exposed to the agent, etc.). The first property identified as common to all pits is their geometrical scaling with a (Hurst) exponent of 0.63 +/- 0.12. Furthermore, the ratio omega of the surface area of the pit as represented at coarse scales through the wavelet representation, over the area of its intersection with the plane at zero depth is found to be 1.17 +/- 0.07 consistently. The ratio of the total surface area over its intersection is found to be 1.6 +/- 0.2. Either one of these ratios together with the Hurst exponent provide sufficient information for obtaining a pit's geometry from images capturing its two-dimensional shape only, a capability important for efficient characterization. Additionally, such a characterization is paramount for rigorously addressing fatigue crack initiation and propagation. (C) 2000 Editions scientifiques et medicales Elsevier SAS.
Περιγραφή
Λέξεις-κλειδιά
multiscaling, pitting corrosion, wavelets, wavelet analysis, growth, fatigue, surfaces
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000086381400006
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών