NUMERICAL STRESS STATE EVALUATION OF POWDER NANOFILLED METAL-POLYMER COMPOSITE MATERIALS AT ELECTROCONTACT SINTERING

VADIM KOVTUN, MITKO MIHOVSKI, VLADIMIR PASOVETS, VICTOR BIRYUK, YORDAN MIRCHEV
2019 Journal of Theoretical and Applied Mechanics  
The technique, design schemes and adaptive finite element models for an assessment of the stress states are developed. Processes of contact interaction of components of powder systems of "microdispersed metal-plated polymer-carbon nanostructures" have been researched with application of approaches of computer modeling. The regularities of formation of fields of internal stresses in the zone of contact interaction components at electrocontact sintering on the multicomponent system are
more » ... stem are investigated. 344 Numerical Stress State Evaluation of Powder Nanofilled Metal-Polymer... unattainable for traditionally obtained materials on the basis of mono-and polycrystalline structures [5] [6] [7] . The properties of composite materials with a metal matrix are due to the influence of a number of factors: the properties and the type of the matrix; type and amount of filler; the nature of the filler distribution in the matrix; the structure of the composite and the technology of production [8, 9] . Therefore, knowledge of the properties of composites will allow rational use of existing composite materials. And the ability to predict and control the formation of the structure, as well as the physical processes during the contact interaction of the dispersed components of nanofilled metal-polymer systems will allow the creation of new adaptive composites. Electrocontact sintering is accompanied by the appearance of a number of physical and technological effects: a cumulative effect, pinch effect, skin effects, intensive doping and the appearance of new phases. Thereby, the development of new multicomponent composites and coatings based on a metal matrix with a nanostructured carbon filler poses serious problems [10, 11] . It is very important that depending on such technological parameters of electrocontact sintering as pressure on a dispersed medium, amplitude and duration of electric current pulses, the process of forming composites can proceed in different ways, predetermining the change in their structure and properties. Therefore, from the point of view of materials science, the study of the processes of consolidation of the components of nanofilled metal-polymer powder systems activated by cumulative and pinch-effects during electrocontact sintering is a very complex problem. The research of the mechanism of diffusion processes and the formation of the structure of wear-resistant metal-polymer composites structured by carbon nanoparticles, and the patterns of formation of internal stress fields and microdeformations in zones of contact interaction of components at technological impact is an unconventional task. Progress in the field of physical methods of studying solids has led to more indepth notions of both the structure and properties of composite materials and their components. Nevertheless, for the detailed description of the processes of structure formation, as well as various mechanisms of interphase interaction, the use of only experimental approaches is insufficient. The effectiveness of the obtained experimental results largely depends on the adequacy of their evaluation, that is, in establishing correct relations between the composition, structure, and characteristics of the composites. Therefore, physical methods of research also require the use of consistent theoretical approaches and the development of effective computer models. Compared with known experimental methods, model representations are of independent value, since with sufficient correctness they can provide more complete information about the features of the structure of the material, and also to predict its possible properties and applications. In this connection, the application of adaptive computer
doi:10.7546/jtam.49.19.04.03 fatcat:xsztquvwevgfhaszoc2mde3dcq