EVALUATION OF THE THERMAL AND MOISTURE AGING INFLUENCE IN AGGRESSIVE ENVIRONMENTS ON THE CHANGE IN THE OF THE MECHANICAL BEHAVIOR OF FIBERGLASS BY A SHORT BEAM BENDING TESTS BASED ON ACOUSTIC EMISSION TECHNIQUE

The work is aimed at experimental research and description of the mechanical behavior degradation fibrous structural composite material strength properties during thermal moisture aging in aggressive (operational) environments different duration temperatures. object study was STEF fiberglass. a laminated fiberglass reinforced plastic obtained by hot pressing glass fabric impregnated with thermosetting binder based on combined epoxy phenol-formaldehyde resins. After preliminary under various temperature-time conditions, samples were tested normal temperature for interlayer shear. To defect initiation propagation deformation after conditions environments, acoustic emission method used this work, which makes it possible to stage structure track processes associated formation defects composite. Influence media, such as industrial water, sea water machine oil, durations (15, 30, 45 days) temperatures (22°, 60° и 90 °С) destruction implementation mechanisms damage accumulation quasi-static interlaminar shear tests analyzed. paper presents test results signals processing. data illustrating stages are presented described, main loading microstructure using stereomicroscope before media described.