Abstract
ObjectivesThe analysis of the features of application of fiber-reinforced polymer composite materials (PCM) of different nature in the structural elements of aviation technology and methods of increasing the strength of their products.MethodIt is indicated on the positive effect on the strength of the bending stress and interlayer shear finish treatment of cured PCM in the microwave electromagnetic field. It is noted that the peculiarity of the elements of the skin of PCM is the presence in the surface layer of the built-in metal mesh, or lightning-proof coating (MFP), necessary to ensure the stability of structural elements to the effects of atmospheric electricity discharges.Result. The tests of the control and processed in the microwave electromagnetic field samples from PCM with MSP on low-cycle fatigue at the number of loading cycles-60 and strain amplitudes-10 mm. it was Found that in the control samples with the grid MEU primary crack appears after 6 cycles. After microwave processing, the samples retain their integrity, but the load causing the set deformation is reduced by 14% already on the 35th cycle.ConclusionDurability of samples with the heat-treated grid "Тekstilmash" and with a grid without heat treatment after influence of microwave electromagnetic field increases respectively by 59,5% and 71%. At the same time, the samples retain their integrity after 60 loading cycles, and the maximum stresses are reduced by 13.7% and 5.8%, respectively, compared to static tests. The limit of low-cycle fatigue increases after microwave treatment from 37 to 210%.
Highlights
Objectives The analysis of the features of application of fiber-reinforced polymer composite materials (PCM) of different nature in the structural elements of aviation technology and methods of increasing the strength of their products. It is indicated on the positive effect on the strength of the bending stress and interlayer shear finish treatment of cured PCM in the microwave electromagnetic field
It is noted that the peculiarity of the elements of the skin of PCM is the presence in the surface layer of the built-in metal mesh, or lightning-proof coating (MFP), necessary to ensure the stability of structural elements to the effects of atmospheric electricity discharges
The tests of the control and processed in the microwave electromagnetic field samples from PCM with MSP on low-cycle fatigue at the number of loading cycles-60 and strain amplitudes-10 mm. it was Found that in the control samples with the grid MEU primary crack appears after 6 cycles
Summary
Durability of samples with the heat-treated grid "Тekstilmash" and with a grid without heat treatment after influence of microwave electromagnetic field increases respectively by 59,5% and 71%. Возникающие при воздействии СВЧ электромагнитного поля на сформированные и отвержденные изделия из армированных углеродными волокнами ПКМ, изучены недостаточно, а механизмы их вызывающие не выявлены. Нами выполнены исследования возможности повышения эксплуатационных характеристик заготовок и деталей из композиционных угле- и стеклопластиков воздействием на окончательно отвержденные ПКМ СВЧ электромагнитным полем частотой 2450 МГц в течение 2-3 минут. Целью исследований явилось изучение влияния СВЧ электромагнитного поля на циклическую изгибную прочность образцов из армированного углеродными волокнами ПКМ с МЗП, в виде встроенной в поверхностный слой металлической сетки при малом числе высокоамплитудных циклов нагружения. 1. Проведение экспериментальных исследований: образцы на трехкоординатном столе под излучающим рупором установки «Жук-2-02» (а); экспериментальная установка для проведения испытаний (б); начальная (в) и конечная (г) стадии циклического нагружения образца. Рис. 3 Графики циклического нагружения контрольного (а, б) и обработанного (в, г) образцов из пластика ВКУ с сеткой МЭУ
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