Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

The scattering of ultrasonic waves by multiphase polycrystals.

Ultraschallstreuung in mehrphasigen Polykristallen
: Hirsekorn, S.

Journal of the Acoustical Society of America : JASA 83 (1988), Nr.4, S.1231-1242
ISSN: 0001-4966
ISSN: 1520-8524
Fraunhofer IZFP ()
dispersion; Gefüge; Geschwindigkeit; Streukoeffizient; Streuung; Theorie; Ultraschall

The theory of ultrasonic propagation in single-phase polycrystals presented in previous articles (J.Acoust.Soc.Am 72,1021-1031 (1982); 73, 1160-1163 (1983)) is generalized to calculate the scattering coefficients and phase and group velocities of plane compressional and shear waves in multiphase polycrystals. The analytical calculation was done for macroscopically isotropic materials with phases of cubic, hexagonal, or orthorhomic single-crystal symmetry in second-order perturbation theory using the assumption that the relative mean quadratic deviation of the wavenumbers in the polycrystal considered from its homogeneous isotropic approximation is small. Numerical evaluation is carried out for a two-phase material of alpha- und gamma-Fe. (IZFP)