Abstract
The paper considers the problem of elastic wave reflection from a free surface moving with a constant velocity. Analytical expressions in the approximation of geometrical acoustics are derived for the frequency shifts, angles of reflection, and reflection coefficients of P, SV, and SH waves to estimate the strain state at the free surface. Based on respective calculations, the reflection coefficients and strain amplitudes at the free surface are analyzed as against each other and against the wave incidence angle, surface velocity, and elastic material parameters. The strain variation due to the motion of a free boundary is compared with frequency shifts.
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