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Mechanical and tribological properties under dry sliding friction of polyphenylene sulfide based composites filled with carbon fibers of various dimensions are investigated. The joint analysis of experimental results together with data of computational experiments allows one to make more substantiated conclusions about the influence of structural features of the composites onto their effective properties. For numerical simulation on the effective properties of highly filled composites, the method of gradual matrix filling was employed. The latter allows one to estimate the required optimum degree of filling. Comparison of the obtained results with the experimental data testifies for the correctness of the developed approach when it is applied to determine the properties of highly filled polymer PPS based composites. [ABSTRACT FROM AUTHOR]

The chemical content of polyphenylene sulfide (PPS) based composite with specified physical–mechanical properties is determined in the study with the use of experimental data on the dependence of effective properties (volumetric wear, elastic modulus, elongation at break, etc.) versus the values of control parameters. The latter are degree of filling with (i) Short Carbon Fibers (SCF) of ~70 μm long and (ii) Chopped Carbon Fibers (CCF) ~2 mm long. After the required number of experimental reference points has been determined the technique for data supplementation up to a regular numerical array with the use of linear interpolation is employed. The obtained dependences of the effective properties versus the control parameter values are constructed in the form of surfaces and corresponding isolines. At the contour plots, a region with the required effective properties is then highlighted. Since the regions overlap each other, their intersection determines the allowable control parameters range that impart the required values to the effective properties. The possibility to design filled polymer materials with a complex of predefined strain-strength and tribological properties is demonstrated. The experimental results are used to gain the reference points in contrast to the previously used approach when a set of computational experiment data were employed. On the one hand, the combination of a full-scale laboratory and computational experiments makes the process of modeling and design materials more evident, clear and reasonable from a physical point of view. On the other hand, it allows to interpret the results as more reliable, as well as less time and material consuming. [ABSTRACT FROM AUTHOR]

In contrast with neat polymers, filled polymeric composites of ultrahigh molecular weight polyethylene (UHMWPE) are certainly more efficient in manufacturing industrial products (for instance, when reinforcing fibers are loaded). An experimental-theoretical technique for designing a polymer composite with specified properties is discussed in the paper. An approach to determine control parameters (phase composition, physical and mechanical properties, etc.) in order to design a composite with prescribed effective properties or providing them within a predetermined range is proposed. With the use of the approach based on the experimental data analysis in concern of effective characteristics versus the values of the control parameters, corresponding response surfaces of the physical-mechanical characteristics are constructed in the space of states. This allows one to determine the correct and reachable values of the control parameters. The calculated response surfaces make it possible to reveal the range of values of control parameters for specified characteristics of multicomponent reinforced extrudable UHMWPE polymer composites. [ABSTRACT FROM AUTHOR]