## 1 Introduction  
Glass Fiber-Reinforced Plastic (GFRP) pipes are widely used in various industries due to their exceptional mechanical properties, corrosion resistance, and durability [1]. These materials are particularly favored in environments where conventional materials like steel may suffer from rapid degradation due to aggressive environmental factors [2; 3; 4]. GFRP pipes support sustainable development by reducing maintenance needs and extending service life, particularly in challenging conditions, which conserves resources and minimizes environmental impact. However, to ensure the long-term reliability of GFRP pipes, it is very important to accurately characterize their mechanical properties, particularly under the influence of environmental factors such as temperature, humidity, and chemical exposure. The mechanical properties of GFRP pipes, particularly their circumferential (hoop) strength, are essential for their application in various industries, including water supply, chemical processing, and oil and gas transportation. Several methods exist for evaluating the circumferential tensile properties of composite products, including the hydrostatic pressure test, flat crush test, segment-type ring burst test, ring burst test, and split-disk test [5]. Unlike the hydrostatic burst test, which requires testing the entire product, the split-disk test offers distinct advantages, such as simplicity, cost-effectiveness, and higher efficiency [5]. The split-disk method has emerged as a standard technique for evaluating these properties. This method involves subjecting a ring or disk cut from the pipe to a diametrical compression, providing valuable insights into the material's hoop strength and failure characteristics. Numerous studies [5; 6; 7; 8; 9; 10; 11; 12; 13] have explored different aspects of this testing method, each contributing to a more nuanced understanding of composite materials' behavior under various conditions, including the influence of aggressive environments [2; 14; 15; 16; 17; 18]. The exploration of mechanical testing methods is a central theme in the study of composite materials. [PERSON] et al. [5] used the split-disk test for measuring filament-wound composites' mechanical properties using 3D Digital Image Correlation and finite element modeling, finding that friction between the ring and disk significantly affects the strain measurements and identifying a low strain zone at the ring split due to local bending. In a similar work, [PERSON] et al. [6] investigated the split polymer test method, focusing on the behavior of polymer composites under stress, exploring how different processing parameters affect continuous fiber-reinforced epoxy composite tubes produced by filament winding. Their findings revealed that the type of epoxy resin had little effect on the performance, while carbon fibers and winding angles greater than 60\({}^{\circ}\) significantly improved the tubes' strength. Both studies underscore the importance of split-disk techniques in advancing the understanding of material behavior under conditions that mimic real-world scenarios. Furthermore, these findings align with the work of [PERSON] et al. [7] and [PERSON] and [PERSON] [8], who concentrated on the mechanical measurements in polymer and tubular materials, respectively. The study presents [19] a method for characterizing filament-wound composite pipes using glass/vinylester and carbon/epoxy materials. Tubular samples were tested through a split-disk and a newly designed biaxial test, which minimized the stress concentration and ensured alignment. An optical technique assessed the void content, and failure envelopes in the \(\sigma 2-\tau 12\) plane were obtained and compared with common failure theories. The Puck criterion accurately predicted failure, especially under combined torsional and compressive loads. Another study [10] uses finite element analysis to explain why split-disk tests yield lower FRP rupture strains than flat coupon tests.