Journal
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
Volume 121, Issue 4, Pages EL125-EL130Publisher
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.2710745
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Nonlinear resonant ultrasound spectroscopy (NRUS) consists of evaluating one or more resonant frequency peak shifts while increasing excitation amplitude. NRUS exhibits high sensitivity to global damage in a large group of materials. Most studies conducted to date are aimed at interrogating the mechanical damage influence on the nonlinear response, applying bending, or longitudinal modes. The sensitivity of NRUS using longitudinal modes and the comparison of the results with a classical linear method to monitor progressive thermal damage (isotropic) of concrete are studied in this paper. In addition, feasibility and sensitivity of applying shear modes for the NRUS method are explored. (c) 2007 Acoustical Society of America
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