Quantitative enhancement of fatigue crack monitoring by imaging surface acoustic wave reflection in a space-cycle-load domain

Journal Article · Thu Jun 23 00:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3592108· OSTI ID:21511621

Connolly, G D; Rokhlin, S I ^[1]

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1. Ohio State University, Edison Joining Technology Center, 1248 Arthur E Adams Drive, Columbus, OH 43221 (United States)

The surface wave acoustic method is applied to the in-situ monitoring of fatigue crack initiation and evolution on tension specimens. A small low-frequency periodic loading is also applied, resulting in a nonlinear modulation of reflected pulses. The acoustic wave reflections are collected for: each experimental cycle; a range of applied tension and modulation load levels; and a range of spatial propagation positions, and are presented in image form to aid pattern identification. Salient features of the image are then extracted and processed to evaluate the initiation time of the crack and its subsequent size evolution until sample failure. Additionally, a method for enhancing signal to noise ratio in Ti-6242 alloy samples is demonstrated.

• OSTI ID: 21511621
• Journal Information: AIP Conference Proceedings, Vol. 1335, Issue 1; Conference: Review of progress in quantitative nondestructive evaluation, San Diego, CA (United States), 18-23 Jul 2010; Other Information: DOI: 10.1063/1.3592108; (c) 2011 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACOUSTIC TESTING
CRACK PROPAGATION
CRACKS
EVOLUTION
FAILURES
FATIGUE
IMAGES
LOADING
MODULATION
MONITORING
NONDESTRUCTIVE TESTING
NONLINEAR PROBLEMS
PERIODICITY
PULSES
REFLECTION
SIGNAL-TO-NOISE RATIO
SOUND WAVES
SURFACES
TITANIUM ALLOYS
WAVE PROPAGATION
ALLOYS
DIMENSIONLESS NUMBERS
MATERIALS HANDLING
MATERIALS TESTING
MECHANICAL PROPERTIES
TESTING
TRANSITION ELEMENT ALLOYS
VARIATIONS