Determination of lamb wave dispersion data in lossy anisotropic plates using time domain finite element analysis. Part II: application to 2-2 and 1-3 piezoelectric composite transducer arrays.
The use of finite element modeling, combined with optical generation and detection of Lamb waves in plate structures, was extended to encompass periodic ceramic-polymer materials typical of those encountered in 1-3 and 2-2 piezoelectric composite array transducers. The resultant dispersion data was employed to predict the occurrence of Lamb wave-induced cross talk in composite monolithic arrays. The finite element modeling method was then used to simulate the dispersion behavior of two array structures that were subsequently manufactured: a 1-D 45% volume fraction linear array coupon and a 2-D 35% volume fraction array coupon. Excellent agreement between theory and experiment was obtained using impedance measurements and laser scans of the surface displacement profile at selected frequencies. Regions of strong inter-element cross-coupling were identified and these are shown to correlate very well with the dispersion data obtained for the dual-phase plate material. This work is considered to provide a useful basis for the design of wideband monolithic composite arrays and minimization of guided wave propagation along the array substrate.
Hayward
Gordon
G
The Center for Ultrasonic Engineering, The University of Strathclyde Glasgow G1 1XW, Scotland. g.hayward@eee.strath.ac.uk
Hyslop
Jamie
J
D016880:Anisotropy; D003198:Computer Simulation; D004548:Elasticity; D004563:Electrochemistry / Q000295:instrumentation* / Q000379:methods; D004735:Energy Transfer; D020342:Finite Element Analysis; D008956:Models, Chemical; D011108:Polymers / Q000032:analysis / Q000737:chemistry*; D013314:Stress, Mechanical; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods; D014732:Vibration
D011108:Polymers