In this study, a technique based on guided ultrasonic waves coupled with an uncertainty analysis is developed to quantify the deviation from the assumed nominal value of the material constants of quasi-isotropic fiber-reinforced composites. It is shown that the measured group velocities vary depending on the location within the laminate, opening the possibility of questioning whether the assumed nominal values of the material properties could accurately represent the entire material system at any region. Furthermore, after the identified material parameters are defuzzyfied, a new set of nominal values for the material properties is determined. These preliminary findings might allow for the development of other efficient, nondestructive material characterization techniques in the future.
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