Abstract
A low-frequency multimode ultrasonic Lamb wave method for characterizing the thickness, density and elastic constant of ultrathin uni-direction fiber-reinforced composite layer was presented. The thickness of the plate is only a fraction of ultrasound wavelength. The dispersion properties of the Lamb wave propagating along and parallel to the fiber direction were derived, which is the basis of such characterization. In conjunction with the method of least squares, the secant algorithm was used to estimate the parameters of the composite layer. The reasons for evaluating errors of parameters and the sensitivity of all methods for different parameters were analyzed. Using the ultrasound coupler and a pair of broadband longitudinal wave transducers with 2 MHz center frequency can estimate the parameters of the ultrathin GF/PSF composite layer by combination with employing the leaky guided wave frequency-domain analytical method.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 20-24 |
| Number of pages | 5 |
| Journal | Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica |
| Volume | 18 |
| Issue number | 1 |
| State | Published - Feb 2001 |
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- General Chemistry
- Condensed Matter Physics
- Mechanics of Materials