Abstract
Elastic constants of unidirectional carbon fiber reinforced polymer (CFRP) laminates are determined by water immersion ultrasonic sing-around method. The unidirectional CFRP has hexagonal symmetry, and the five independent stiffness constants (C11, C12, C13, C33, C44) are derived from the two series of sing-around periods. In the one series, the fiber direction is set to be always perpendicular to the incidence-refraction plane. From the measurement result, C11, C12 and C66 are obtained explicitly. In the other series, the fiber direction is set to be contained in the incidence-refraction plane. From this result, C13, C33 and C44 are obtained by successive approximation using least square method.
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