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Active Wave Modulation for Bond Evaluation

[+] Author Affiliations
Hwai-Chung Wu

Wayne State University, Detroit, MI

Paper No. IMECE2002-33487, pp. 91-96; 6 pages
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Nondestructive Evaluation
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Nondestructive Evaluation Division
  • ISBN: 0-7918-3649-5 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME


Many recent studies have indicated that externally bonded Fiber Reinforced Plastic (FRP) composite sheets can be used effectively to strengthen concrete structures. Composite action suggests that the individual parts of a composite work together as one. Stresses must be transferred from one constituent to the other through some interface. If there is little or no bond at the interface then there is little or no transfer of stress and therefore poor composite action. In this study, we intend to develop a NDE tool for evaluating such interfacial bond conditions. Attention is placed on an innovative active modulation approach, Nonlinear Wave Modulation Spectroscopy. In this procedure, a probe wave will be passed through the system. Simultaneously, a second, modulating wave will be applied to the system to agitate the state of damage in the materials. The resulting frequency modulations will be analyzed, and will be correlated to the presence of the interfacial flaws between a FRP thin sheet and concrete substrate.

Copyright © 2002 by ASME
Topics: Waves



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