Study of the Possibility of Stress Diagnostics of Composite Structures Based on Data From Control of Deformation and Acoustic Emission by Integrated Fiber-Optic Sensors

This article describes the results of theoretical researches and develops a mathematical model for continuous optical non-destructive testing of stresses arising in structures made of polymer composite materials under static loads in tension and compression, using embedded point fiber-optic strain sensors based on fiber Bragg gratings and acoustic emission based on Fabry−Perot interferometer. It is theoretically justified and experimentally confirmed that the proposed model, taking into account the accepted assumptions, establishes a functional connection between the intensity of energy release during loading of a composite structure and the effective values of deformations and stresses. Using the proposed mathematical model, methods have been developed for continuous optical testing of stresses and acoustic emission pulses arising in monolithic structural elements made of carbon fiber reinforced plastic, manufactured by autoclave molding, under static loading in tension and compression.