Ultrasonic goniometric immersion tests for the characterization of fatigue post-LVI-damage induced anisotropy superimposed to the constitutive anisotropy of polymer composites

摘要

We study an ultrasonic experimental approach for the damage characterization of polymer composites. Our approach is based on the key concept that damage of polymer composites involves a damage induced anisotropy superimposed to, the constitutive anisotropy of the material. Thus, we correlate the damage to the analysis of the change in the anisotropy of the acoustic response of the material, by using an innovative goniometric ultrasonic immersion device designed and built at our laboratory. The experiments are performed on a glass fiber reinforced composite material (GFRP), damaged first by a low velocity impact (LVI), and then by fatigue load cycles.