BASELINE UT MEASUREMENTS FOR ARMOR INSPECTION
- Center for Nondestructive Evaluation, Iowa State University, Ames, IA 50011 (United States)
Some prototype armor panels are fabricated from several layers of dissimilar material bonded together. These may include ceramics, graphite composites, fiberglass composites and rubber. The ultrasonic properties of these layers influence inspections for armor defects. In this paper we describe measurements of ultrasonic velocity, attenuation, sound beam distortion and signal fluctuations for the individual layers comprising one armor prototype. We then discuss how knowledge of these properties can be used when choosing an optimum frequency for an ultrasonic pitch/catch immersion inspection. In our case an effective inspection frequency near 1.5 MHz affords: (1) adequate strength of through-transmitted signals in unflawed armor; (2) adequate lateral resolution for detecting small disbonds at interfaces; and (3) low levels of UT signal fluctuations due to the natural inhomogeneity of certain armor layers. The utility of this approach is demonstrated using armor panels containing artificial disbonds at selected interfaces.
- OSTI ID:
- 21371004
- Journal Information:
- AIP Conference Proceedings, Vol. 1211, Issue 1; Conference: Review of progress in quantitative nondestructive evaluation, Kingston, RI (United States), 26-31 Jul 2009; Other Information: DOI: 10.1063/1.3362196; (c) 2010 American Institute of Physics; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ARMOR
CERAMICS
COMPOSITE MATERIALS
EPOXIDES
FIBERGLASS
FLUCTUATIONS
GRAPHITE
INTERFACES
LAYERS
MHZ RANGE
RUBBERS
ULTRASONIC TESTING
ACOUSTIC TESTING
CARBON
ELASTOMERS
ELEMENTS
FREQUENCY RANGE
MATERIALS
MATERIALS TESTING
MINERALS
NONDESTRUCTIVE TESTING
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
ORGANIC POLYMERS
POLYMERS
TESTING
VARIATIONS