Effect of inner reinforcement on the torsional load-bearing performance of holed aluminum/composite thin-walled tubes

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This research systematically investigated the effect on the static torsional performance of holed Al-hybrid tubes internally reinforced with thin-walled glass fiber tubes. In this context, specimens were fabricated by the filament winding method for various stacking sequences, including [90/Al/90], [Al/90], [90/Al], [±452/Al], [±452/Al/90], and [90/±452/Al]. Subsequently, experimental studies were conducted. The experimental studies indicated that, in the holed aluminum tube, because of buckling deformation of the wall under torque, the part's geometry loses its circularity and tends to take the shape of an ellipse and then loses its load-bearing capacity following tear damage. It is understood that the reinforcement applied with 90° fibers from internally is more effective than the reinforcement applied externally to delay the buckling behavior of the tube under torque in Al-hybrid structures. It is revealed that the torque carrying capacity of the [±452/Al/90] structure increases by a factor of 2.7 compared to the aluminum tube in terms of specific torque; the value of 3.31Nm/gr for the Al tube is found to be 4.15 Nm/gr for the hybrid structure. Regarding fabrication techniques, it is seen that the removable plaster mold method can be successfully used to obtain internally reinforced Al-hybrid specimens.