Author :
Wang, Z. ; Jen, C.K. ; Cheeke, J.D.N.
Abstract :
Quantitative material characterization of a two-layer isotropic composite plate having eight parameters (h1, VL1, VS1, ρ1, h2, VL2, VS2, ρ2) are presented; where h is the thickness, VL and VS are longitudinal and shear wave velocities respectively, and ρ is the density. Subscripts 1 and 2 refer to the plate and coating. An improved modal frequency spacing method (MFS) has been realized and three explicit MFS equations related to (h1, VL1, ρ1, h2, V L2, ρ2) are derived. In our numerical simulations we assume the values of h1, ρ1 and h2, and are able to evaluate VL1 VL2 and ρ2 using the above three MFS equations. The results show the high accuracy of our approach and also validate the sensitivity analysis of each parameter. Discussions on the evaluation of all eight material properties through inversion are also given
Keywords :
composite materials; numerical analysis; surface acoustic waves; ultrasonic materials testing; ultrasonic velocity; cutoff frequency equation; density; inversion; leaky Lamb-waves; longitudinal velocity; modal frequency spacing method; numerical simulations; quantitative material characterization; sensitivity analysis; shear wave velocity; thickness; two-layer isotropic composite plate; Acoustic testing; Leaky waves; Nondestructive testing; Nonhomogeneous media; Numerical analysis; Plates; Surface acoustic waves;
