Экспериментальное и теоретическое исследование механизмов повреждений металлов и композиционных материалов с покрытиями в условиях многократного высокоскоростного каплеударного воздействия
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-Новые подходы к формулировке условий внешнего нагружения с учетом параметров внешней дисперсной среды и скорости полета,используемые в рамках разрабатываемых расчетных методов.
-Результаты доработки экспериментальной установки(Китай),с реализацией контроля формы и размера отверстия форсунки,а также проведение анализа взаимосвязи между формой капли и конструкции форсунки для достижения контроля качества капли.
-Формулировка требований к экспериментальным образцам,изготовление и подготовка образцов,передача образцов на испытания(будут использованы имеющиеся в наличие материалы).
-Участие в двухсторонних семинарах.Командировки в Китай и в Россию участников проекта,обмен опытом в области проводимых исследований.Публикация не менее 3 совместных публикаций в рейтинговых журналах.
Droplet erosion is a process of damage formation on aircraft surfaces during high-speed flight through rain zones.Despite the small size of the droplets and their small mass,multiple impacts on the material surface lead to material spalling and wear,which can,as a result,lead to complete destruction of nose fairings,heat shield elements,turbine blades,changes in the geometry of aerodynamic surfaces,reduction of flight safety,etc.
The solution to the problem of drop-impact erosion is related to the choice of sufficiently strong materials and rationing of flight conditions.Building theoretical models and developing methods of experimental investigation of the processes of drop-impact erosion is an important component in solving the problem of providing surface protection for high-speed aircraft.
In modern practical design,when objects(such as aircraft,wind turbine blades,engine fan,compressor blades,etc.)operate at high speed,damage caused by drop-impact on the surface is called rain drop erosion.Damage due to rain erosion may not be obvious at the initial stage of exposure,but then it will lead to a decrease in strength,degradation of physical and mechanical properties of the material,as well as the appearance of local flaking,which significantly affects the functional properties of structural materials and,consequently,leads to a decrease in structural strength.
In high-speed aircraft,heterogeneous composite materials such as C/C,C/SiC,etc.,used in the leading edge of the nose,rudder,nose fairing,are significantly subject to surface damage caused by drop-impact during flight at high speeds.In this case,oxidative coating and structural damage on the surface pose a serious threat to flight safety.The extremely high relative velocity between the raindrops and the aircraft can cause deformation and failure of components such as windows and radar fairing,which in turn leads to instrument failure and can put flight safety into question.Therefore,it is very important to study the mechanism of dynamic behavior of fluids and materials during the action of rain erosion.
The scientific novelty of the research project is determined by the following:
1)In theoretical terms,it is proposed to use a new numerical-analytical method based on the use of surface functions of influence and allowing to reduce resource-intensive calculations.It is proposed to investigate for the first time not only single,but periodic and stochastic modes of drop impact.
2)It is proposed to develop the apparatus of surface functions of influence within the framework of the dynamic gradient theory of elasticity,allowing to take into account the scale parameters(in space and in time)and to connect them with the characteristic size and duration of the droplet impact on the material surface.This should make it possible to further reduce the computational resource intensity and determine the dynamic response of the material by a superposition of solutions,instead of integrating and convolving the fundamental solutions with the external load functions.
3)In the experimental research,it is planned to optimize the experimental setup(China),to implement control of the shape and size of the nozzle orifice,and to analyze the relationship between the drop shape and nozzle design to achieve control of the drop quality.Provide a new experimental approach to investigate the fracture mechanism of high velocity drop impact on metals and strong plastic materials.Perform drop impact testing at various velocities and angles on specimens.Use laser speedometers and other instruments to measure the velocity of a high velocity drop-impact jet.Apply optical non-contact methods such as digital image processing to measure and analyze surface stress distribution,deflections and velocities from the plane and other material and structural conditions during drop-impact deformation.
Expected results:-New models of dynamic theory of elasticity and methods for predicting the onset of damage formation in structural materials with protective coatings as a result of dynamic drop-impact(based on the method of surface functions of influence).
-New approaches to the formulation of external loading conditions,taking into account the parameters of the external dispersed medium and the velocity of flight,used in the framework of the developed calculation methods.
-The results of refinement of the experimental setup(China),with the implementation of control of the shape and size of the nozzle orifice,as well as an analysis of the relationship between drop shape and nozzle design to achieve quality control of the drop.
-Formulation of requirements for experimental samples,fabrication and preparation of samples,submission of samples for testing(available materials will be used).
-Participation in bilateral seminars.Project participants'trips to China and Russia,exchange of experience in the field of ongoing research.Publication of at least 3 joint publications in rating journals.