neobjavljeni prilog sa skupa
Polymer composites are becoming an almost indispensable material in the automotive industry. Their mechanical properties in combination with low mass are beneficial for reducing the overall vehicle weight and improving energy efficiency. Design variability, simplicity of production and low corrosion are additional advantages for application of
polymer composites in the automotive industry. Composite properties can be further adjusted to specific needs by producing hybrid composites as they contain at least two types of reinforcements in a single or common unique matrix. In this paper hybrid composites were produced by combining epoxy resin matrix reinforced with carbon and basalt
fibres. The main goal was to investigate how different stacking layups of carbon and basalt layers affect mechanical properties of composite. Carbon fibre fabrics used for production of composite are twill woven, while basalt fibre fabric is woven in the form of cross-twill weave. For test specimens for testing of mechanical properties four composite plates were produced with hand lay-up process. As a reference and for later comparison two plates were produced with only one fibre type: first one was produced by laminating only carbon fibres and second by only basalt fibres. Two plates were produced with different hybrid fibre stacking, one with twelve alternating layers of carbon and basalt fibres and one with outer layers made of carbon fibres (three layers on each side of plate) and six inner layers made of basalt fibres. From each plate test specimens were cut out in three different orientations (0°, 45°, 90°). In addition to determining tensile properties, for further testing and FEM simulations Poisson's ratio and tensile modulus were determined. All tests were carried out at the room temperature of 22 ºC. Tensile properties, Poisson's ratio and tensile modulus were determined according to the standard HRN EN ISO 527:2022. After analysing the tensile modulus results, it can be clearly concluded that for samples with 0° orientation, the values for hybrid composites, regardless of the stacking method, are between the values for carbon fibres and basalt fibres only. Tensile modulus for sample orientation 45° and 90° have similar trends, where hybrid composites have lower value than the any of the plates with only one type of fibre. Unlike the modulus, the Poisson's ratio values are mostly affected by the sample orientation,
with the highest values for 45°orientation and practically the same values for 0° and 90° orientation.
automotive industry; hybrid polymer composites; poisson factor
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