Numerical investigation of innovative nonlinear ultrasonic spectroscopy for detection and sizing interface defects in composites

Authors

  • V. Kniazev Wave Process Simulation System Laboratory Ltd

DOI:

https://doi.org/10.5755/j01.u.66.2.528

Keywords:

composite material, interface defect, nonlinear wave/defect interaction, nonlinear ultrasonic spectroscopy, modeling and simulation, numerical method, opposite phased transducer, subharmonic and superharmonic, period-doubling bifurcation

Abstract

The article is devoted to innovative nonlinear acoustic techniques of non-destructive testing (NDT) of composites. Modern composites have a very complex inhomogeneous structure with a large number of interface bond-lines. Along these bond-lines there are interface defects, such as delaminations, microcracks, debonding and weakening of adhesive bonds. This leads to the necessity of distinguishing from each other a signal from given defects and a signal from interface bond-lines. The task becomes more complicated because interface defects have a very small thickness of micro or even nanoscopic scale. Conventional techniques of ultrasonic testing have a very low sensitivity of these defects detection. The article describes a novel acoustic-mechanical approach to numerical modeling of nonlinear acoustic interaction of ultrasonic wave with interface defect. The results of computer simulation of this nonlinear acoustic interaction are analyzed. A simple technique of nonlinear ultrasonic spectroscopy is suggested for detecting and sizing the interface defects.

http://dx.doi.org/10.5755/j01.u.66.2.528

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Published

2011-07-14

Issue

Section

ONLINE WORKSHOP: NDT&E OF COMPOSITE MATERIALS COMPNDT – MAY 2011