The influence of service solutions on the longitudinal and circumferential tensile properties of glass-polyester composi
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THE INFLUENCE OF SERVICE SOLUTIONS ON THE LONGITUDINAL AND CIRCUMFERENTIAL TENSILE PROPERTIES OF GLASS-POLYESTER COMPOSITE PIPES M. Stamenović,1 S. Putić,2 S. Drmanić,2 M. Rakin,2, 3 and B. Medjo2 In numerous cases, metals and alloys traditionally used as structural materials in the process equipment can now be successfully replaced by nonmetallic composite materials. We study the influence of service solutions on the state of stress and tensile properties of glass-polyester pipes in the longitudinal and circumferential directions. These analyses are of great importance for the use of examined pipes in chemical industry. The pipes were produced by “Poliester” Corporation (Priboj). The influence of two solutions, methanol and ammonia, was studied. The samples were treated in solutions for three, seven and ten days. After this, the samples were subjected to tensile testing by the standard procedure. The stresses and strengths were determined both in the longitudinal direction (testing on flat test specimens) and in the circumferential direction (ring tests). The analysis of test results, according to the type of solution and the period of holding, was realized in comparison with the results obtained by testing intact pipes (not subjected to the influence of the solution). The micromechanical analysis of broken samples helped to determine the influence of the solution on the structure of composite pipes and determine the models and mechanisms responsible for the decrease in strength. Keywords: glass-polyester composite pipe, tensile test, ring test, influence of solution, micromechanical analysis.
The extensive development of polymer engineering, as well as the capabilities of polymers in combination with other materials to form new synthetic structures with improved mechanical properties, lead to a real expansion in the use of composite materials followed by continuous improvement of the technology of their manufacturing and application. Composite materials have a wide range of usage, thanks to their good properties under external loading, specific mechanisms of cracking and capability of accumulation of energy. Moreover, they are now highly competitive with the classical structural materials. Among their advantages, we can mention relatively small mass, good strength/mass and stiffness/ mass ratios, good static and dynamic properties, good corrosion resistance, simplified fabrication, and the time of assembling. All stated advantages explain the fact that composite pipes are now extensively used in chemical, building, infrastructure, and military industry. An important use of the pipes made of glass-fibers–polyester-resin composites is in the chemical industry. Pipes made for this usage are subjected to the influence of static and dynamic loads during their operation. In view of the conditions of possible operation in the chemical industry, the aim of the present work is to determine the influence of solutions (e.g., fluids transported through the glass-polyester composite pipes) on their tensile properties in the lo
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