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Proceedings Paper

Cross-validated detection of crack initiation in aerospace materials
Author(s): Prashanth A. Vanniamparambil; Jefferson Cuadra; Utku Guclu; Ivan Bartoli; Antonios Kontsos
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Paper Abstract

A cross-validated nondestructive evaluation approach was employed to in situ detect the onset of damage in an Aluminum alloy compact tension specimen. The approach consisted of the coordinated use primarily the acoustic emission, combined with the infrared thermography and digital image correlation methods. Both tensile loads were applied and the specimen was continuously monitored using the nondestructive approach. Crack initiation was witnessed visually and was confirmed by the characteristic load drop accompanying the ductile fracture process. The full field deformation map provided by the nondestructive approach validated the formation of a pronounced plasticity zone near the crack tip. At the time of crack initiation, a burst in the temperature field ahead of the crack tip as well as a sudden increase of the acoustic recordings were observed. Although such experiments have been attempted and reported before in the literature, the presented approach provides for the first time a cross-validated nondestructive dataset that can be used for quantitative analyses of the crack initiation information content. It further allows future development of automated procedures for real-time identification of damage precursors including the rarely explored crack incubation stage in fatigue conditions.

Paper Details

Date Published: 28 March 2014
PDF: 11 pages
Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 906429 (28 March 2014); doi: 10.1117/12.2045207
Show Author Affiliations
Prashanth A. Vanniamparambil, Drexel Univ. (United States)
Jefferson Cuadra, Drexel Univ. (United States)
Utku Guclu, Drexel Univ. (United States)
Ivan Bartoli, Drexel Univ. (United States)
Antonios Kontsos, Drexel Univ. (United States)

Published in SPIE Proceedings Vol. 9064:
Health Monitoring of Structural and Biological Systems 2014
Tribikram Kundu, Editor(s)

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