The paper considers the effect of various stress concentrators on processes of damage accumulation, initiation and propagation of crack in steel (steel 3) samples during uniaxial tensile. In the middle of the samples there was a transverse welded joint or a hole with a diameter of 5 mm. The acoustic-emission testing results showed that weight content of location impulses (Wi) in the clusters of low, middle and high energy level and criteria parameters value Wi at the stages of the samples destruction have similar pattern of change despite the various types of concentrators, stress-strain material diagrams, pattern of damage accumulation, number of registered acoustic emission (AE) events and its registration activity.
The initial cause of the acoustic emission (AE) in the process of deformation and destruction of solids is considered. A theoretical analysis of the processes of transformation and energy dissipation during the destruction of structural bonds of an idealized solid model is carried out. The research of wave process arising in the deformation and rupture of fiber reinforced composites is conducted using AE system A-line32D and PCI-2, vibration analyzer Onix, high speed camera Videosprint and numerical simulation in the software LS-DYNA. The obtained experimental and calculated data showed that the main energy in the time interval after the fiber rupture is released in the range of audio frequencies less than 2 kHz. The peak values energy recorded in the ultrasonic frequency range does not exceed a few percent relative to the maximum level at the carrier frequency in the audio range.
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