Cross-validated detection of crack initiation in aerospace materials

Prashanth A. Vanniamparambil; Jefferson Cuadra; Utku Guclu; Ivan Bartoli; Antonios Kontsos

doi:10.1117/12.2045207

28 March 2014 Cross-validated detection of crack initiation in aerospace materials

Prashanth A. Vanniamparambil, Jefferson Cuadra, Utku Guclu, Ivan Bartoli, Antonios Kontsos

Proceedings Volume 9064, Health Monitoring of Structural and Biological Systems 2014; 906429 (2014) https://doi.org/10.1117/12.2045207
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

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.

Citation Download Citation

Prashanth A. Vanniamparambil, Jefferson Cuadra, Utku Guclu, Ivan Bartoli, and Antonios Kontsos "Cross-validated detection of crack initiation in aerospace materials", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 906429 (28 March 2014); https://doi.org/10.1117/12.2045207

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