Producing Steel Fiber Reinforced Polymer Composite Pipes
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This study has introduced a novel non-annealed stainless steel fiber with 8 $\mu m$ diameter to make a steel fiber reinforced polymer composite pipe. The primary objective was to make the pipes by the filament winding method. The aim was to report on the mechanical properties, and failure modes of these stainless steel fiber reinforced polymer composite pipes with a ductile epoxy resin system and to evaluate their performance for potential applications in the offshore industry. The mechanical behavior under quasi-static compression was evaluated experimentally in both axial and radially to the hoop directions, along with the in-plane shear properties. The in-plane mechanical properties were determined by use of resistance strain gauge measurements bonded to the axial and hoop directions of the test samples. Also, their buckling behavior under external pressure was evaluated experimentally to understand their buckling behavior. Microscopy, burn-off test, and thickness measurements were performed on the produced test samples to determine the volume fraction of fiber, void content, and thickness. Stainless steel fiber reinforced polymer composite cylindrical pipes with $\pm 55\degree$ layup, and different thickness (three and six layers) were successfully made by the filament winding method. Test results indicate that the steel fiber reinforced polymer composites exhibit a much higher strain-to-failure than a typical UD carbon fiber composite (almost three times) combined with a high stiffness (about 80 $GPa$). Also, the SFRP composites exhibit similar ductile deformation behavior to that of the dry UD continuous steel fiber, i.e., an initial elastic response, a definite yield point and consecutive plastic and strain hardening behavior.