cahtНаучный вестник МГТУ ГАCivil Aviation High Technologies2079-06192542-0119Moscow State Technical University of Civil Aviation (MSTU CA)10.26467/2079-0619-2021-24-6-66-81caht-1902Research ArticleАВИАЦИОННАЯ И РАКЕТНО-КОСМИЧЕСКАЯ ТЕХНИКАAVIATION, ROCKET AND SPACE TECHNOLOGYРасчетная оценка усталостной долговечности углепластика в образцах двухсрезного болтового соединенияFatigue life predictions of carbon fiber reinforced plastic in specimens of double-shear bolted jointСтрижиусВ. Е.StrizhiusV. E.

Стрижиус Виталий Ефимович, доктор технических наук, профессор кафедры проектирования и сертификации авиационной техники

г. Москва

Vitaly E. Strizhius, Doctor of Technical Sciences, Professor of Aircraft Engineering and Certification of Aeronautical Equipment Chair

Moscow

vitaly.strizhius@gmail.comМосковский авиационный институт (национальный исследовательский университет)РоссияMoscow Aviation Institute (National Research University)Russian Federation2021271220212466681Copyright © Стрижиус В.Е., 20212021Стрижиус В.Е.Strizhius V.E.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://avia.mstuca.ru/jour/article/view/1902

Отмечено, что в современных композитных авиаконструкциях присутствует значительное количество композитных и металлокомпозитных срезных болтовых соединений, усталостная долговечность которых является важным фактором обеспечения безопасности эксплуатации таких конструкций. Ввиду этого особое внимание при испытаниях и расчетных оценках элементов таких конструкций уделяется оценке усталостной долговечности слоистых композитов в подобных соединениях. Несмотря на значительное число публикаций и исследований по этой теме, можно отметить, что многие важные методические проблемы в этой области еще не решены. К таким проблемам можно отнести следующие: выбор основной моды усталостного повреждения слоистых композитов в срезных болтовых соединениях; неопределенность базовой кривой усталости; практическое отсутствие каких-либо моделей, представляющих диаграммы постоянной усталостной долговечности слоистых композитов в рассматриваемых соединениях; неопределенность правила суммирования усталостных повреждений в слоистых композитах в рассматриваемых соединениях. По результатам обзора и анализа данных ряда отечественных и зарубежных публикаций, а также по результатам специально проведенных исследований предложены решения отмеченных проблем. Проведена верификация предложенных решений на примере анализа расчетных и экспериментальных данных по усталостной долговечности ламинатов из углепластика НТА7/6376 [45/-45/0/90]3S в образцах двухсрезного болтового соединения.

It is noted that in modern aircraft composite structures there is a significant number of composite and metal-composite shear bolted joints, the fatigue life of which is an important factor to ensure the operating safety of such constructions. Thus, special attention is given to the evaluation of the layered composites fatigue life in such joints during tests and calculations of the similar structures components. Despite a considerable number of publications and studies on this subject, it can be observed that many important methodological issues have not been solved yet in this field. These problems can deal with the choice of the main mode of layered composites fatigue damage in shear bolted joints; the uncertainty of the basic fatigue curve; the practical absence of some models, representing diagrams of constant life fatigue for the layered composites in the joints under consideration; the uncertainty of fatigue damage summation rule in the layered composites in the investigated joints. Based on the review results and the data analysis of domestic and foreign publications including the results of specially conducted studies, the solutions to these problems are proposed. The proposed solutions were verified by analyzing the calculated and experimental data on the fatigue life of carbon fiber reinforced plastic laminates НТА7/6376 [45/-45/0/90]3S in the double-shear bolted joints specimens.

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The authors declare that there are no conflicts of interest present.