ACOUSTIC EMISSION CONTROL OF THE PROCESS OF DESTRUCTION OF SAMPLES FROM CARBON PLASTIC DURING STATIC LOAD, POSITIVE AND NEGATIVE TEMPERATURES

Abstract

Strength tests of T800 carbon-fiber specimens with geometrical dimensions 100×600×0.9 mm were performed. The CFRP material used a stacking of nine mono-layers [±45/90/03/90/±45]. In the central part of the samples, a stress concentrator was placed in the form of a hole with a diameter of 12 mm. The loading with a static tensile load was carried out by the loading machine MTS-100 with hydraulic grips. Simultaneously with static loading, the sample was affected by positive (+20; +100 °С) or negative (–20; –40; –60 °С) temperatures. Registration information was carried out using the method of acoustic emission (AE). In the process of loading the samples, the effect of static load and temperature on the main informative parameters (amplitude, dominant frequency, structural coefficient) of AE signals recorded during the loading of samples was studied. The structure coefficient, reflecting the energy at one frequency, and the coefficient, calculated as a partial energy, were compare.