Title :
Interface delamination of layered media: acoustic spectroscopy and modal analysis
Author :
Hirao, Masahiko ; Ogi, Hirotsugu ; Sato, Keiji
Author_Institution :
Graduate Sch. of Eng. Sci., Osaka Univ., Japan
fDate :
4/1/2004 12:00:00 AM
Abstract :
We have developed a method of resonance ultrasound spectroscopy (RUS) to study the acoustic spectral response to interface delamination in a triple-layered rectangular parallelepiped [Al (aluminum) /polymer/ Al]. Combination of laser-Doppler interferometry and the Rayleigh-Ritz approximation affected mode identification in the measured resonance spectrum. Point-contact RUS is capable of sensing a minute delamination (1.5% of total area). Modal analysis using a number of resonance modes can deduce the delamination area and location in the interface. Not only screening but also defect characterization is possible. At the same time, some resonance modes are totally insensitive to an interface imperfection. These modes are found to have virtually no strain energy arising from the bonding layer.
Keywords :
Rayleigh-Ritz methods; acoustic resonance; acoustic wave interferometry; aluminium; delamination; modal analysis; polymer films; ultrasonic measurement; Al; Rayleigh Ritz approximation; acoustic spectral response; acoustic spectroscopy; bonding layer; defect characterization; interface delamination; interface imperfection; laser Doppler interferometry; layered media; modal analysis; resonance ultrasound spectroscopy; screening; triple layered rectangular parallelepiped; Aluminum; Delamination; Interferometry; Laser modes; Modal analysis; Nonhomogeneous media; Polymers; Resonance; Spectroscopy; Ultrasonic imaging;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
DOI :
10.1109/TUFFC.2004.1295429