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An assessment of the reliability of CFRP composites used in nodes of friction after impact of UV-A impacts and thermal shocks

Krzyzak Aneta, Racinowski Damian, Szczepaniak Robert, Kosicka Ewelina

Eksploatacja i Niezawodność

2023

Vol. 25, no. 4

art. no. 174221

This article describes the results of tribological research into epoxy-based composites reinforced with carbon fiber. The composites were subjected to accelerated tests simulating asemi-annual influence of environmental conditions of an elevated temperature, precipitation in combination with an influence of UV-A radiation of 0.83 W/m2 as well as cyclic thermal shocks causing a leap temperature difference of 116.5°C. The process of friction was conducted in conditions of dry friction and wet friction in the presence of water. The authors found apositive influence of a two-month impact of environmental conditions upon increasing wear resistance. They found a reduction in weight in conditions of friction with water. At the same time, a reliability analysis for the same boundary conditions showed an increased risk of critical composite damage. The article indicates areas of safe exploitation of composites and areas of the necessity of withdrawing composites from further exploitation under the assumed environmental and tribological loads.

Selected Construction Properties of Hybrid Epoxy Composites Reinforced with Carbon Fiber and Alumina

Krzyżak Aneta, Relich Szymon, Kosicka Ewelina, Szczepaniak Robert, Mucha Mateusz

Advances in Science and Technology. Research Journal

2022

Vol. 16, no 2

240--248

The purpose of this study is to investigate the impact of the introduction of powder modifier into composite reinforced with carbon fabric on selected mechanical properties. The tests were performed on 16 groups of hybrid epoxy composites, including one reference group and 15 groups containing alumina with the grain size of F220, F240, F280, F320 and F360, added in the weight percent of 5%, 10% and 15%. This composite was made of certified components designed for application in the aviation industry. Test results indicated that an increase of alumina content by weight caused a decrease of strength of polymer composites in most tests. In addition, the value of the force transferred by the composite in the tensile test increased disproportionately to the cross section, which resulted in decreased strength, while the addition of alumina impeded the super-saturation of the carbon fabric, which caused discontinuities in the matrix material.