Richard Brynsvold, U.S. Army, TACOM, Warren, MI 48397, Tele: 810-574-8718, Fax: 810-574-8667,
Abstract:
Acoustic waveguides (AWG) of 10 mil diameter Nichrome for example, can be embedded within composite materials during their manufacture for monitoring curing parameters and for providing sensing signals for process control. Following the manufacture of a composite part the embedded AWG can then be used during the material lifetime for measuring internal strain and for sensing and locating damage. In the work reported here which was performed under a contract with the U.S. Army Tank Automotive Command*, the embedded AWG were used to measure both the compressive and tensile strains within a stressed glass reinforced resin part.
It was found that as the part was subjected to increasing strain up to 2500 us the attenuation of signals transmitted through the embedded AWG correlated with measurements from surface mounted strain gauges. In this paper, simultaneous measurements of AWG attenuation, strain gauge readings and optical strain patterns are reported on and discussed. * Contract: DAAE07-93{:-R121 National Automotive Center/U.S. Army (TACOM)/Westinghouse STC, C.O.T.R.: Capt. Richard Brynsvold
Source: Proceedings of the 'NDE applied to Process Control of Composite Fabrication' - Conference, 4-5 Oct 1994 St. Louis, Missouri. Publisher and Organizer: Nondestructive Testing Information Analysis Center (NTIAC) Texas Research Institute Austin, Inc. Austin, Texas [http://www.ntiac.com] [Buying the Proceedings]
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