In general, the prediction the effective properties of fiber reinforced composites is a complicated task due to its heterogeneous properties. Therefore, new approaches can make possible obtaining of the reliable thermal properties of composites with least time and financial costs. This work presents the approach for determination of thermal properties of epoxy-based glass fiber reinforced composites. Firstly, to evaluate the thermal behavior of considered material the numerical modeling was conducted via finite element analysis in commercial software MSC Digimat. To validate the model, two-stage experimental study was carried out. As the result of the experimental research thermal conductivity through-plane was obtained by laser flash method as well as thermal conductivity in-plane – by specialized heat equipment developed in Bauman University with subsequent solution of the inverse heat conduction problem. Summing up, the analytical and experimental data showed good agreement that demonstrates the feasibility of the approach.
The study is dedicated to the solution of a complex problem – development of an optimal thermal design of the tourist class reusable space vehicle (RSV TC) wing structure. The complexity of the problem resides in the necessity to consider critical factors of the suborbital flight and in a number of nesting tasks,that need to be solved. The authors implemented a multiscale modeling approach covering design of hybrid composite material thermal properties (i.e. mesoscale level), determination of thermal loads and thermal state analysis of a composite wing (i.e. macroscale and structural scale levels). Analysis of thermal fields demonstrated the necessity of thermal protection (TP) application for the wing structure. Consequently, optimal from the weight efficiency point of view TP thicknesses were determined. Summing up, the results of a RSV TC wing structure development are presented in the current paper.
In comparison with other types of transmissions currently used, mechanical continuously variable transmissions are capable of providing significant technical and economic advantages, which makes research in this area relevant. This paper presents a mechanical and mathematical method that allows for studying the dynamic processes that take place during operating a controlled mechanical continuously variable transmission with an elastic element and a one-way clutch which provides for transmitting torque to the driven shaft in one direction only.
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