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Proceedings Paper

Laser scanning technique for fatigue damage evolution detection
Author(s): Vladimir B. Markov; Benjamin D. Buckner; J. C. Earthman
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Paper Abstract

Metal components subjected to cyclic stress develop surface-evident defects (microcracks, slip bands, etc). Monitoring the formation and evolution of these fatigue damage precursors (FDPs) with increasing numbers of cycles can be an effective tool for determining the fatigue state of the component, which can be used in remaining fatigue life prognostics. In this paper a laser scanning technique (LST) for FDP detection is described and experimental results from examination of specimens made of nickel-based superalloy and aluminum are presented. The proposed detection technique is based on scanning a focused laser beam over the specimen surface and detecting variations in spatial characteristics of the scattered light signal. These variations indicate the presence of surface abnormalities and therefore can be associated with incremental fatigue damage formation. The studies performed show that the proposed LST can serve as a basis for design of a portable non-contact instrument for in situ structural health monitoring.

Paper Details

Date Published: 14 February 2005
PDF: 11 pages
Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); doi: 10.1117/12.611746
Show Author Affiliations
Vladimir B. Markov, MetroLaser, Inc. (United States)
Benjamin D. Buckner, MetroLaser, Inc. (United States)
J. C. Earthman, Univ. of California/Irvine (United States)

Published in SPIE Proceedings Vol. 5776:
Eighth International Symposium on Laser Metrology
R. Rodriguez-Vera; F. Mendoza-Santoyo, Editor(s)

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