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TsAGI Science Journal

ISSN 印刷: 1948-2590
ISSN オンライン: 1948-2604

TsAGI Science Journal

DOI: 10.1615/TsAGISciJ.2017020273
pages 899-911

METHOD FOR DETERMINATION OF ENERGIES FROM ACCIDENTAL IMPACTS ON THE AIRCRAFT STRUCTURE

Stanislav Vyacheslavovich Dubinsky
Central Aerohydrodynamic Institute (TsAGI), 1, Zhukovsky str., Zhukovsky, 140180, Moscow region
Ivan Aleksandrovich Zharenov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, Moscow Region, 140180, Russia
Vyacheslav Mikhailovich Ordyntsev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, Moscow Region, 140180, Russia
Mikhail Valerievich Pavlov
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky Str., Zhukovsky, Moscow Region, 140180, Russia

要約

A method to identify the energy levels of accidental impacts that aircraft experience in operation has been developed. This allows impact data collected from the fleet of metal airplanes to be extended to the fleet of composite structures. The method is based on the functional dependence between the depth of the dent on the metal skin and the impact energy. The main assumptions made while deriving the dependence are tested on structurally similar samples: the mechanisms of elastic and plastic dissipation occurring during the collision are examined and a correlation with the energy of the main parameters influencing the dent formation process is checked. It is shown that for a comprehensive description of the dent it is sufficient to have the data on its depth and the thickness of the skin that accepts the impact. The dependence of the impact energy on the dent depth and the skin thickness for flat plates is obtained. The dependence is approximated with allowance for the elastic interaction determined from the experiment. A corresponding three-dimensional function for a duralumin alloy is derived. The use of this function to determine the laws that characterize the impact energy is demonstrated by an example of dents on the high-lift elements of the Yak-42 and Tu-154 aircrafts. The distribution function and probability density of the energy impacts are found. It is shown that the developed method does not change the physical character of the data during the transition from the depths to the impact energies. The use of the developed method as applied to dents on metal panels of transport category airplanes allows us to characterize, in terms of energies, the regular features of impacts experienced in operation of composite aircraft, which is necessary to analyze its strength and durability.