Abstract
Objectives. The aim of the research is to study the influence of the microwave electromagnetic field on the thermophysical characteristics of PCM reinforced with carbon fibers as one of the factors indicating a certain restructuring of the material, leading to a change in its operational properties.Method. The use of modifying hardening effects that do not lead to excessive destructuring heating of materials.Result. Based on the analysis of scientific and technical literature and trends in the development of technical transport and energy systems, a steady increase in the cons umption of fibrous polymeric composite materials (PCM) in their structures has been revealed. The prospects of applying the effects of microwave radiation (microwave electromagnetic field) on the formation of the required properties of products from PCM and the feasibility of studying the mechanisms of interaction of microwave radiation with the structure of solidified PCM are shown. Experimental studies of the thermophysical interaction of PCM reinforced with carbon fibers with a microwave electromagnetic field with a frequency of 2450 MHz were performed.Conclusion. The fact of more intensive heating of samples of greater thickness and their greater shielding capacity was established. In the study of the thermophysical parameters of PCM subjected to preliminary processing in the microwave electromagnetic field by the modified Parker method, an increase in certain exposure modes of the thermal and thermal conductivities by 20% was observed, which indicates an increase in adhesive bonds in the interfacial zones and an increase in the structure density. This fact can be used in the development of technologies for modifying products from PCM, designed to work in conditions of elevated temperature gradients, which will reduce the magnitude of thermal stresses.Acknowledgment. The research was supported by RFBR grant No. 17-03-00720 «Methodology of optimising microconstruction of composite materials for complex shape objects with increased dynamic strength, formed layer-by-layer by electrotechnological methods».
Highlights
The aim of the research is to study the influence of the microwave electromagnetic field on the thermophysical characteristics of polymeric composite materials (PCM) reinforced with carbon fibers as one of the factors indicating a certain restructuring of the material, leading to a change in its operational properties
Experimental studies of the thermophysical interaction of PCM reinforced with carbon fibers with a microwave electromagnetic field with a frequency of 2450 MHz were performed
In the study of the thermophysical parameters of PCM subjected to preliminary processing in the microwave electromagnetic field by the modified Parker method, an increase in certain exposure modes of the thermal and thermal conductivities by 20% was observed, which indicates an increase in adhesive bonds in the interfacial zones and an increase in the structure density
Summary
Существуют различные подходы к решению указанной проблемы, в частности много внимания уделяется соблюдению технологических процессов при производстве материалов, изучению свойств наполнителя и связующего, используются расчетные методы, исходными данными для применения которых является безусловное знание параметров состава, структуры, схемы армирования композита. Широко известны факты колебаний механических характеристик композиционных материалов, в частности, в 1,5-2 и более раз при формировании заготовок изделий различными способами, например, «мокрой» и «сухой» намоткой, при переработке этих заготовок в готовые изделия различными методами формования, например, вакуумным, автоклавным и прессовым, а также в результате различной подготовки выбранных волокон к переработке в составе композита и отклонений от оптимальных режимов переработки материала. Для локального управляющего воздействия на структуру и прочностные свойства трехмерного или двумерного объекта из неметаллических материалов в качестве наиболее эффективных методов представляются применение микроволнового излучения (СВЧ электромагнитного поля).
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