Abstract: In the current stage of technical and technological advancement, the widespread use of composite materials across various fields is driven by their many positive properties, including the stability of their mechanical, physical, and chemical parameters. These properties significantly determine product quality. Given the advantageous characteristics of composite materials, they are suitable for use in interlaboratory qualification tests, where strict requirements are placed on the stability and durability of test samples. Key parameters for testing are determined at the initial stage of control sample preparation. These include the specifics of the studied object, test methods, testing equipment, data analysis methods, the accuracy of obtained results, repeatability, reliability, and reproducibility. Based on multiple trials, the testing laboratory assigns the control parameter value in accordance with certifying organizations’ and/or ISO 13528:2022 requirements. Typically, quality control tests for composite materials are performed at various stages of the product's life cycle, from manufacturer to consumer, under conditions with high variability in operators, environmental factors, equipment, and testing techniques. Therefore, ensuring consistent results across different laboratories is essential. The aim of this study was to assess the compliance of interlaboratory testing by measuring mechanical properties (compression, tension, and bending) using a high-accuracy universal testing machine, the Zwick Roell Z100. The control samples were manufactured from epoxy pre-impregnated fiberglass fabric, recommended as reference material for qualification trials in interlaboratory testing.

Keywords: Fiberglass epoxy prepreg, Composite materials, Interlaboratory testing, Control sample, Compression, Tensile Strength

Pages: 29-33

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