Application of nonlinear wave modulation spectroscopy to discern material damage

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Description

Materials containing structural damage have a far greater nonlinear elastic response than materials with no structural damage. This is the basis for nonlinear wave diagnostics of damage, methods which are remarkably sensitive to the detection and progression of damage in materials. Here the authors describe one nonlinear method, the application of harmonics and sum and difference frequency to discern damage in materials. The method is termed Nonlinear Wave Modulation Spectroscopy (NWMS). It consists of exciting a sample with continuous waves of two separate frequencies simultaneously, and inspecting the harmonics of the two waves, and their sum and difference frequencies (sidebands). ... continued below

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9 p.

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Johnson, P.A.; Sutin, A. & Abeele, K.E.A. van den April 1, 1999.

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Description

Materials containing structural damage have a far greater nonlinear elastic response than materials with no structural damage. This is the basis for nonlinear wave diagnostics of damage, methods which are remarkably sensitive to the detection and progression of damage in materials. Here the authors describe one nonlinear method, the application of harmonics and sum and difference frequency to discern damage in materials. The method is termed Nonlinear Wave Modulation Spectroscopy (NWMS). It consists of exciting a sample with continuous waves of two separate frequencies simultaneously, and inspecting the harmonics of the two waves, and their sum and difference frequencies (sidebands). Undamaged materials are essentially linear in their response to the two waves, while the same material, when damaged, becomes highly nonlinear, manifested by harmonics and sideband generation. The authors illustrate the method by experiments on uncracked and cracked plexiglass and sandstone samples, and by applying it to intact and damaged engine components.

Physical Description

9 p.

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OSTI as DE99002411

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  • 2. international conference on emerging technologies in NDT, Athens (Greece), 24-26 May 1999

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  • Other: DE99002411
  • Report No.: LA-UR--99-753
  • Report No.: CONF-990505--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/334312 | External Link
  • Office of Scientific & Technical Information Report Number: 334312
  • Archival Resource Key: ark:/67531/metadc684050

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  • April 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 1:22 p.m.

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Johnson, P.A.; Sutin, A. & Abeele, K.E.A. van den. Application of nonlinear wave modulation spectroscopy to discern material damage, report, April 1, 1999; New Mexico. (digital.library.unt.edu/ark:/67531/metadc684050/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.