This paper addresses the problem of constructing a subsystem of informational decision-making support for choosing the optimal method and algorithm for calculating the thermophysical properties of polymer composites, which allows minimizing the error in determining properties under given experimental conditions. The subsystem is based on a modified hierarchy analysis method. It is built on the alternative use of four algorithms for the calculation of thermophysical properties and is included as a module in the application software of an intelligent data-measuring device for studying the curing process of polymer composites. Using simulation modeling, an assessment of the possibility of using algorithms for calculating thermophysical properties under various combinations of experimental conditions was made. The structure, composition, principles of construction, purpose, capabilities and parameters of the main modules of the applied software of the data-measuring device are described.
This study contributes to the understanding of the thermo-chemical processes occurring in the cure of polymer composites, especially in thick structures.During the manufacturing process, thermo-chemical properties of the material undergo considerable changes and are affected by a high number of factors.Therefore, the main part of this analysis is the improvement of the strategy and the experimental study of the material properties behavior during the manufacturing process of the polymer composite.The thermo-chemical properties, simulation of the cure process and the calculation of the optimal production cycle of thick polymer composite structures are executed by a specialized computer-measuring system.The results of the study of the thermo-chemical properties during the curing of polymer composites and optimal cure cycles for industrial applications of thick structures manufacturing are presented.
Considered computer-measuring system includes in the structure a subsystem of the research and calculation of the optimum curing cycles of the glutinous prepreg products. Subsystem of research allows to determine the thermophysical, kinetic, rheological and dielectric characteristics directly in the process of curing prepregs, which are used by a subsystem of calculation for search of curing cycles of the polymer composite materials. The system in an automatic mode operates experiment, carries out acquisition, processing and ordering of the experimental data, allows to solve the optimization problem of finding the temperaturetime cycles of the curing of composites products, including thick-walled products.
The paper studies computer aided measurement including subsystems of research and designing. The subsystem of research enables to determine thermophysical, kinetic, dielectric and rheological characteristics of composite materials during curing cycle. Calculation of optimum curing cycle of thick-wall polymer composite products is made by subsystem of designing. Integrated computer aided measurement has a united database; for calculation of cycles it uses characteristics produced by subsystem of research. In automated mode the system controls the experiment, acquires, processes and systemizes experimental data, it enables to solve inverse problems of heat transfer and kinetics as well as optimization problems of detection of temperature-time curing cycles of polymer composite products.
Es ist die Methode der Experimentellfeststellung von Parametern des Bindemittelfliesens im Prozess der Hartung von Erzeugnissen aus den auf Grund der warmhartbaren Bindemittel durch die Methode der luftleeren Autoklavformierung und des heisen Pressens erzeugenden Polymerkompositionsstoffen vorgeschlagen. Die Methode grundet sich auf die Messung der Verkleinerung der Probedicke durch das Bindemittelfliesen unter dem technologischen Druck.Est proposee la methode de la definission experimentale des parametres decoulement du liant lors du durcissement des materiaux composites de polymere fabriques a la base du formage autoclave et du pressage a chaud. La methode est fondee sur la mesure de la diminution de lepaisseur de lechantillon pour le compte de lecoulement du liant sous la pression technologique.The method of experimental determination of binder flow parameters in the cure of items made of polymer composite materials is proposed. The technique of vacuum autoclave moulding and hot pressing of thermo-reactive binders is used. The method is based on measuring the reduction of sample thickness due to binder outflow under working pressure.
The task of control for the process of curing of polymer composite materials, including carbon plastics is discussed on the basis of dielectric measurements and determining the curing degree in real time using the calculated functions of interdependence. The method of obtaining functions of interdependence of dielectric penetrability and the curing degree of polymer composites is proposed. The results of experimental research and automated system of scientific research is represented.