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Regularities of Change in Microhardness in the High Section of Fiberglass, Scratch Resistance by Indenter, and Formation of Texture of Sclerometric Grooves

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Inorganic Materials: Applied Research Aims and scope

Abstract

Specimens made of glass-reinforced plastic with a thickness of 2.2 mm, made on a melt binder EDT-69N, were scratched using a laboratory sclerometer at various loads on the indenter; scratches were applied both to the front surface of the specimens in the fractional and transverse directions and to thin sections made in two mutually perpendicular planes along the thickness of the samples. It was found that, with an increase in the load on the indenter, the force of resistance to scratching also increased, while the width of the formed groove increased. The force of resistance to scratching in the transverse direction relative to the orientation of the fibers was 30–45% higher than the force of resistance to scratching when the indenter moves along the filler fibers, while the groove channel had torn edges due to the destruction of the transverse fibers of the fiberglass. Microscopic studies were carried out on grooves applied to the front surface of the samples and in the plane of transverse sections, where the destruction of filler fibers oriented parallel and perpendicular to the plane of the section was investigated. The microhardness of the matrix of the samples was studied on transverse thin sections in the core and subsurface zones in two mutually perpendicular planes, conventionally called lateral and end surfaces. It was found that the value of the microhardness of the core zone of the matrix exceeded the values of the microhardness of the matrix in the subsurface zones of the samples by 13–14 MPa; no difference in the values of the microhardness of the matrix in mutually perpendicular planes was noted. The roughness of the front and back surfaces of the samples was studied and it was shown that the roughness of the front surface of the sample was two times lower than the roughness of its back side.

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Authors and Affiliations

  1. Ulyanovsk Scientific-Technological Center, Federal State Unitary Enterprise All-Russian Scientific Research Institute of Aviation Materials, 432010, Ulyanovsk, Russia

    E. A. Veshkin, V. V. Semenychev, V. I. Postnov & E. V. Krasheninnikova

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  1. E. A. Veshkin
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  2. V. V. Semenychev
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  3. V. I. Postnov
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  4. E. V. Krasheninnikova
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Correspondence to E. A. Veshkin.

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Translated by M. Drozdova

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Veshkin, E.A., Semenychev, V.V., Postnov, V.I. et al. Regularities of Change in Microhardness in the High Section of Fiberglass, Scratch Resistance by Indenter, and Formation of Texture of Sclerometric Grooves. Inorg. Mater. Appl. Res. 13, 21–28 (2022). https://doi.org/10.1134/S2075113322010403

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