Eventos Anais de eventos
MECSOL 2019
7th International Symposium on Solid Mechanics
Scattering of ultrasonic waves in unidirectional composites
Submission Author:
Daniel Marcus Giglioli de Oliveira , SP
Co-Authors:
Daniel Marcus Giglioli de Oliveira, Vanessa Vieira Gonçalves, Auteliano Antunes dos Santos Junior
Presenter: Vanessa Vieira Gonçalves
doi://10.26678/ABCM.MECSOL2019.MSL19-0003
Abstract
The stress distribution and the elastic constants can be determined using the velocity of ultrasonic waves travelling inside the material. The relationship between these parameters is found from the acoustoelasticity theory. However, the waves propagating in heterogeneous and anisotropic materials, as in composite materials, undergo considerable dispersion. Knowing this effect is particularly important for stress measurement, since the dispersion could lead to an erroneous safety estimative. The purpose of this study is to evaluate the dispersion of longitudinal ultrasonic waves in unidirectional carbon-fiber composites, aiming to model its effect on the wave propagation velocity. A special developed sample with 24 faces was built and measurements were taken in angles from 0° up to 90° from the fiber direction using through transmission technique. The results show that there are significative differences in the propagation velocity depending on the angle and call for a very strict control of the transducers positions during stress measurements.
Keywords
Composite Materials, non-destructive tests, Ultrasound, stress measurement, Wave Scattering
