Monitoring Composite Fiber Failure Using Acoustic Emission System, Vibration Analyzer, and High-Speed Video Recording

We consider the nature of the phenomenon of acoustic emission (AE) occurring in the process of deformation and destruction of solid bodies. A theoretical analysis of the processes of transformation and dissipation of energy during the destruction of structural bonds of an idealized model of a solid has been carried out. Using A-line32D and PCI-2 AE systems, Onyx vibration analyzer, and Videosprint high-speed camera, as well as numerical simulation in the LS-DYNA software environment, we study wave processes occurring during deformation and rupture of reinforcing fibers of composite materials. The obtained experimental and calculation data indicate that the main energy is emitted within the period of the aftereffect of fiber rupture in the range of sound frequencies less than 2 kHz. In this case, the energy of the peak values recorded in the ultrasonic frequency range does not exceed several percent of the maximum level at the carrier frequency in the audio range.