cahtНаучный вестник МГТУ ГАCivil Aviation High Technologies2079-06192542-0119Moscow State Technical University of Civil Aviation (MSTU CA)caht-317Research ArticleСтатьиМоделирование роста трещин в элементах авиаконструкций при случайных режимах нагруженияSimulation of crack growth life in the skin elements of aviation constructions under variable-amplitude loadingНиконовВ. В.NikonovV. V.noemail@neicon.ruШапкинВ. С.ShapkinV. S.noemail@neicon.ruMSTU CARussian FederationSSRI CARussian Federation2014071120160208512Copyright © Никонов В.В., Шапкин В.С., 20162016Никонов В.В., Шапкин В.С.Nikonov V.V., Shapkin V.S.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/317

В статье приводится обоснование возможности и области применения уравнения Пэриса-Эрдогана для моделирования развития трещин усталости при случайных процессах нагружения. Приводится методика расчетов, основанная на использовании понятия «базового» случайного процесса и введении эквивалентного коэффициента интенсивности напряжений. Исследуется степень влияния перегрузок на скорость развития трещин. Теоретические положения сопоставляются с результатами экспериментальных исследований трещиностойкости плоских образцов-пластин из сплавов Д16АТ (аналог 2024-Т3) и В95АТВ (аналог 7075-Т6). Нагружение в эксперименте представляло собой стационарные гауссовские процессы.

The paper shows possibility to use Paris-Erdogan equation for simulation of fatigue crack growth under random loading. In the considered equation effective stress intensity factor range was introduced. The introduced methodology for crack growth simulation is based on the concept of a “basic” random loading. The discussed methodology included consideration of overloads influence on the fatigue crack growth. The theoretical models are based on the experimental researches of fatigue crack growth under random loading that have realized during specimens fatigue tests of two Al-based alloys (D16АТ - the same as 2024-T3, and В95АТВ - 7075-T6). In all cases the random loading has been considered as Gaussian processes of cyclic loading with introduced and discussed parameters of the investigated processes.

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