Improved techniques for the ultrasonic characterization of graphite

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Near-conventional pulse-echo flaw detection techniques can be successfully applied to graphite material. If the specimen configuration (i.e., length-to-diameter ratio) is conducive to the choice of ultrasonic test parameters dictated by the material screening tests, then only the test sensitivity needs to be established. Conventional test block approaches to calibration work well; however, uniform homogeneity of the specimens to be tested must be assumed (depending on the graphite, this may be an invalid assumption). Sensitivities that we have demonstrated typically detect 0.5- to 0.75-mm (0.020 to 0.030-in.) reflectors at depths up to 102 mm (4 in.) for GRAPHNOL (drilled holes, not ... continued below

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Pages: 6

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Cook, K.V. & Simpson, W.A. January 1, 1981.

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Description

Near-conventional pulse-echo flaw detection techniques can be successfully applied to graphite material. If the specimen configuration (i.e., length-to-diameter ratio) is conducive to the choice of ultrasonic test parameters dictated by the material screening tests, then only the test sensitivity needs to be established. Conventional test block approaches to calibration work well; however, uniform homogeneity of the specimens to be tested must be assumed (depending on the graphite, this may be an invalid assumption). Sensitivities that we have demonstrated typically detect 0.5- to 0.75-mm (0.020 to 0.030-in.) reflectors at depths up to 102 mm (4 in.) for GRAPHNOL (drilled holes, not flat bottom). Other materials may dictate inspection for much larger discontinuities. The least sensitive tests performed to date (using the storage oscilloscope approach) required flat-bottom holes of 6.35 mm (0.250 in.) in diameter for calibration. This relatively insensitive test was necessary because of the billet length and material characteristics.

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Pages: 6

Notes

NTIS, PC A02/MF A01.

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  • ASNT fall conference, Atlanta, GA, USA, 12 Oct 1981

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  • Other: DE82001463
  • Report No.: CONF-811003-5
  • Grant Number: W-7405-3NG-26
  • Office of Scientific & Technical Information Report Number: 5907596
  • Archival Resource Key: ark:/67531/metadc1102427

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1981

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 16, 2018, 2:40 p.m.

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Cook, K.V. & Simpson, W.A. Improved techniques for the ultrasonic characterization of graphite, article, January 1, 1981; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1102427/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.