Long Wavelength Approximation for Lamb Wave Characterization of Composite Laminates

Noncontact Determination of Antisymmetric Plate Wave Velocity in Ceramic Matrix Composites

“…It wascoupled to theairthrough abuffer which wasshaped tofocus theultrasound 2 in.beyond itssurface. Wehave shown that, for thecase ofCMCspecimens ofthepresent geometry thefrequency range isverymuch dominated bythelowest antisymmetric plate mode [2,10]. Thismode, inturn, is sensitive toshear andflexure moduli [2],and, in SiC/ Reaction bonded SNcomposite it hasbeen shown sensitive tofiber/matrix interfacial shear strength [9].…”

“…In particular, ceramic matrix composite (CMC) and metal matrix composite (MMC) structures are under active development for these applications [ 1]. The acousto-ultrasonic (AU) method has been shown to be useful for assessing mechanical properties in composite structures [1][2][3][4][5][6][7][8]. In particular, plate wave analysis has been shoWn to be useful [1, 9,10] for characterizing composites in terms of the stiffness moduli.…”

Composite-Concrete Interface Characterization by Lamb Waves

“…Previous efforts of using Lamb waves to inspect defects in composite and metal plates include the works of Chimenti and Nayfeh [4], Nagyet aI. [5], Nayfeh [6], Bar-Cohen and Chimenti [7], Chimenti and Bar-Cohen [8], Martin and Chimenti [9], Mal and Bar-Cohen [10], Tang and Henneke [11], Bridge and Ramli [12], Atalar et.aI. [13,14], Chimenti and Martin [15], Alleyne and Cowley [16], Rose et al [17], Pilarski and Rose [18], Challis and Bork 19], Tung et.al.…”

Noncontact Determination of Antisymmetric Plate Wave Velocity in Ceramic Matrix Composites

“…In particular, ceramic matrix composite (CMC) and metal matrix composite (MMC) structures are under active development for these applications [ 1]. The acousto-ultrasonic (AU) method has been shown to be useful for assessing mechanical properties in composite structures [1][2][3][4][5][6][7][8]. In particular, plate wave analysis has been shoWn to be useful [1,9,10] for characterizing composites in terms of the stiffness moduli.…”