Scientifically substantiated approach to choosing the parameters for forming polymer composites for shell structures

Abstract

678.046.76 G. V. Lunkina, and V. V. SokolovThis article how the strength properties of polymer composites made by ring winding are affected by the parameters of the production process. Relations are found to connect the contact pressure generated during the formation of the composite with the volumetric content of fibers in its structure. It is shown that the tension on the reinforcing material affects the variation of filament length in the roving. The thickness of the composite is found to influence the uniformity of its structure. Scientifically substantiated recommendations are made for choosing the parameters used to make polymer composites employed in shell structures.The final characteristics of polymeric composite materials (PCMs) are formed simultaneously with the completion of the process of manufacturing the product that is being made. Accordingly, in addition to the properties of the initial materials, the choice made for the parameters of the production process also has a significant effect on the mechanical characteristics of the finished PCM. Thus, in the fabrication of shell-like structures with organic-fiber-reinforced composites having superior mechanical characteristics, it is important to determine how the structure and properties of a PCM are related to the parameters of the production process. The goal of our investigation was to determine the parameters for forming PCMs for shell structures operating with high internal pressures.The main characteristic of a PCM -the characteristic that determines whether or not the material meets the requirements specified for use in shell structures -is its strength. In modern practice, the mechanical characteristics of PCMs are determined in mechanical tests involving the brief tension of annular unidirectional 150-mm-diam. specimens by half-disks in accordance with the standard GOST 25.603-82. The shape of the annular specimens, made of an organic-fiber-reinforced plastic, replicates the shape of solids of revolution. The parameters used in making the specimens correspond to the parameters used in the manufacture of actual products.The initial materials used to obtain unidirectional annular specimens of PCMs for our tests were reinforcing materials SVM, Armos, and Rusar-S in the form of roving and epoxy binder EDT-10.The reinforcing material takes up the main load during the loading of PCMs. Thus, the volumetric content of fibers in the composite is the main characteristic that determines the mechanical properties of organic-fiber-reinforced (OFR) plastics. Study of the effect that the volumetric fiber content of a PCM has on its strength has shown that this relation is of an extreme nature (Fig. 1).An increase in the fiber content of an OFR plastic from 55 to 75% (vol.) is accompanied by a monotonic 40% increase in its strength. A further increase in fiber content leads to a sharp reduction in strength. The extreme character "Soyuz" Federal Center for Parallel Technologies (Dzerzhinskii, Moscow Oblast).

Process modeling and parameter optimization based on assumed inherent sensor inversion for composite automated placement

“…4,5 Stokes-Griffin and Compston 6 studied the effect of processing temperature and placement rate on the short beam strength of carbon fibre-PEEK manufactured using a laser tape placement process, and greater rates of cooling were observed at higher placement rates. Yusufov et al 7 discussed the influence of compaction force on the volumetric content, and it was found that the choice made for process parameters had a significant effect on the mechanical characteristics of the finished PCM. Subsequently, some compaction force controllers based on UMAC and fuzzy algorithm were developed to control and monitor the compaction force.…”

“…Yusufov et al. 7 discussed the influence of compaction force on the volumetric content, and it was found that the choice made for process parameters had a significant effect on the mechanical characteristics of the finished PCM. Subsequently, some compaction force controllers based on UMAC and fuzzy algorithm were developed to control and monitor the compaction force.…”