In this work, the use of ultrasonic velocity analysis for the quantitative nondestructive evaluation of the mechanical properties of composite laminates is discussed. The composite laminate is modeled as a layer or set of layers of transversely isotropic material of known orientation. The method described utilizes velocity measurements for ultrasonic wave propagation at multiple angles of incidence. Since the equations are algebraically cumbersome, a numerical procedure employing a commercially available nonlinear equation solving subroutine is utilized. Applications to composite laminates are presented.

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