Матеріали конференцій кафедри конструкції літальних апаратів
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Item Computer aided optical method for aircraft's components fatigue life estimation(2008-09) Ignatovich, S.R.; Karuskevich, M.V.; Maslak, T.P.The results of numerous tests show that quantitative estimation of accumulated fatigue damage may effectively be conducted by computer-aided optical analysis of the surface state. The method may be applied for alclad alluminium alloys which are used for modern aircraft skin manufacturing. The developed optical system and its software allow to determine the density of the areas with slip bands (damage parameter D), and a set of surface pattern fractal dimensions. These parameters allow to indicate more dangerous points of aircraft structures, predict fatigue crack under full scale test of aircraft structures as well as estimate residual service life.Item A novel algorithm for damage analysis of fatigue sensor by surface deformation relief parameters(2013-05) Konovalenko, I.; Maruschak, P.; Menou, A.; Karuskevich, M.; Ignatovich, S.Fatigue damage of metal structures may be estimated by the application of sensors with the surface relief pattern indicating the accumulated fatigue damage. The nature of the deformation relief has been investigated. Digital analysis of the surface patterns based algorithm for the integral evaluation method has proved the efficiency of integral parameters (the general area of damage, mean gradient along the coordinate axes, and the mean amplitude of the histogram function spectrum) application for additional quantitative description of such surface structures. The evolution of deformation relief parameters on the sensors surface is determined by the process of the sensor and construction fatigue damage accumulation.Item The evaluation of the crack-like damage parameter of blades at the vibroacoustical diagnosis of the gas-turbine engines(2012-05) Ignatovich, S.R.; Bouraou, N.This work is devoted to vibroacoustical condition monitoring of the gas-turbine engines (GTE) blades and diagnosis of the crack-like damages at the steady-state and non-steady-state modes of GTE. For detection of the mentioned damages we proposed the application and further development of the low-frequency vibroacoustical diagnostic methods which use vibrating and acoustical noise as diagnostic information. The following amplitude dimensionless characteristics are used as fault features: probability factor, peak factor and factor of background. The evaluation of the crack-like damage of the blades is carried out at the steady-state and non-steady-state modes by using the generalized likelihood method. The statistical quality of the received estimations is investigated.Item Fatigue cracks growth features in aluminum alloy D16AT(2016) Ignatovich, S.R.; Krasnopolskii, V.S.This paper investigates the description of the fatigue cracks growth in sheet aluminum alloy D16AT by exponential dependence. The results show that the propagation of all investigated fatigue cracks can be satisfactorily described by this dependence with grate values of the determination coefficient.Item Синергетическая дискретно-вероятностная модель усталости металлов и сплавов(Институт проблем прочности им. Г.С. Писаренко НАН Украины, 2010-09-28) Юцкевич, Святослав Сергеевич; Пантелеев, В.М.; Радченко, Александр ИвановичРассмотрены результаты исследований процесса усталости ряда металлов и сплавов, которые использовали для обоснования синергетической дискретно-вероятностной модели усталости. Показано, что низкочастотный процесс эволюции диссипативных структур на стадиях усталости при действии циклических нагрузок сопровождается высокочастотными (дискретными) процессами пластического деформирования на наноуровне по кристаллографическим плоскостям скольжения.