Investigation of elastic deformations of cured CFRP structures with embedded cellular metallic elements subjected to a microwave electromagnetic field

Abstract

Based on the analysis of trends in the development of aviation equipment for various purposes, the expansion of the use in its bearing structures of polymer composite materials, reinforced with carbon fibres with a combined structure containing distributed in the volume of metal honeycomb fillers is shown. This increases the anisotropy of the physical and mechanical properties of such structures of different chemical composition and properties of materials, which makes it difficult to manoeuvre the aircraft due to the different stability of metals and composites to multidirectional dynamic bending and shear loads. It is stated that the problem of increasing the strength characteristics of PCM can be solved by their quasi-structuring in the microwave electromagnetic field, but the influence of this factor on complex structures containing metal regular elements needs further study. Experimental studies of the effect of short-term exposure to microwave electromagnetic field with a frequency of 2450 MHz on the modulus of material elasticity, which is a structure of two plates of carbon fibre with aluminium cellular elements located between them. It was found that compared with the control samples, the samples exposed to microwave electromagnetic field have an increased modulus of elasticity by 31.8%. Limit shear stresses also increase by 29%. Thus, the treatment of formed and cured polymer composite materials with built-in cellular metal structures in the microwave electromagnetic field is possible and allows to perform hardening quasi-structuring of such products and increase their performance parameters.