Behavior monitoring of flax fiber reinforced composites by guided waves

The mechanical behavior under static and fatigue loading induced by mechanical forces is examined in this article through the utilization of a non-destructive methodology. However, it is worth noting that the dynamics of elastic waves become notably more intricate when dealing with composite materials. In order to provide a comprehensive description of the green flax/epoxy system, a crucial component of this study involves the computation of guided wave dispersion curves within the test samples. By evaluating the longitudinal and shear modulus under varying stress conditions, the propagation of high-frequency ultrasonic waves, which serves as a dynamic mechanical deformation, can be leveraged to facilitate the comparison of both mechanical and ultrasonic data. The significant changes occurring during the aging process are closely associated with variations in velocity throughout the loading period. The wavelet transformation of all acquired ultrasonic echoes yields the experimental transfer function, thereby enhancing our understanding of the subject matter.