Modern needs when forming key technologies for the creation of high-speed mainline aircraft can be divided into following seven groups covering the basic technical aspects: ensuring an acceptable level of acoustic impact while simultaneously ensuring the required aerodynamic efficiency by creating an integrated construction arrangement of the aircraft; ensuring the target fuel efficiency of the power plant and permissible harmful emissions at supersonic airspeeds while meeting the requirements by noise level at take-off and landing modes; ensuring the target values of the weight and resource efficiency of the aircraft structure while ensuring the required rigidity and aeroelasticity; ensuring reliable stability and controllability in all flight modes; increasing the reliability and functionality of the onboard equipment and systems under kinetic heating conditions; improving the efficiency of onboard systems based on more effective electric aircraft technologies; participating in the creation of international requirements and standards for certification and the operation of new generation aircraft.
In this work, the object of study is an epoxy nanocomposite based on TiO2 nanoparticles and epoxy resin, and the subject is the preparation and physical and mechanical properties of TiO2/epoxy nanocomposites. The characteristics of the properties and methods of synthesis of the initial components for the synthesis of epoxy nanocomposites - epoxy resins and nanoparticles of titanium dioxide are given, and data on epoxy nanocomposites based on nanoparticles of titanium dioxide are presented. It was found that the addition of TiO2 to the epoxy matrix reduces the coefficient of friction and significantly increases the wear resistance of such nanocomposites.
It is known that the mechanical properties of fiber-reinforced composites are controlled by the conditions of contact between the fiber and the matrix. In this regard, great efforts of mechanics are directed to developing various techniques to improve the quality of the interface. The most common are: modification of the fiber surface, improvement of chemical interactions, or the addition of a third phase (interfacial layer) between the fiber and the matrix. The most common are: modification of the fiber surface, improvement of chemical interactions, or a third phase (interfacial layer) between the fiber and the matrix. In this study, the authors aim to examine the effective dynamic properties of a whiskered layer of fibers in modified composites, taking into account the structural characteristics of the interfacial layer – its thickness – length of whiskers, volumetric content of whiskers, and their mechanical properties. The dynamic performance of the whiskered layer surrounding the base fiber in modified composites was estimated. The whiskered layer is considered a fibrous composite formed by nanoscale whiskers grown on the surface and a matrix. An epoxy binder or a viscoelastic polymer is considered as a matrix. An approximate model was used. The effective characteristics of the whiskered layer were modeled and determined as the properties of a transversally isotropic fibrous system with the isotropy axis coinciding with nanowhiskers in the whiskered layer. A feature of the whiskered layer is that the density of whiskers varies with distance from the fiber surface. Therefore, it depends on the length of the nanowhiskers (the thickness of the interfacial layer). In this case, it turns out that the bulk for the matrix in the whiskered layer, even at the maximum density of nanowhiskers grown on the fiber surface and for sufficiently thin interfacial layers, is very significant. Fuzzy fiber composite, nanofibers, epoxy binder, damping properties.
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