Investigation of low speed impact behavior of basalt fiber reinforced filament winding composite tubes under low internal pressure

In this study , ±55o filament winding basalt fibre-reinforced composite tubes were examined under low internal pressure at low speed impact behavior. Low-speed impact tests of composite tubes were performed according to ASTM D 7136 / 7136M standard at 15J, 20J and 25J impact energy levels. The maximum impact force, displacement and absorbed energy values of oil unfilled (hollow), oil filled and non-pressurized (0 bar) and internal pressurized (5 bar) three different composite tubes were determined. When the test results are examined, maximum contact force, contact time, displacement values and maximum absorbed energy values are increased in all BFR / Epoxy composite tube samples with increasing impact energy levels. While the highest maksimum force and the lowest displacement were found in the oil pressurized (5 Bar BTP) samples at same impact energy level, the lowest maximum force and the highest displacement were observed on oil unfilled (hollow) composite tube samples. It was commented that oil internal pressurization of composite tube samples have provided to bending resistance of laminated composite tube internal wall. It was observed that the amount of absorbed energies increased by increasing impact energy levels. Similar absorbed energies have been observed for internal pressurized (5 bar) and oil filled and non-pressurized (0 bar). It was determined that the increasing impact energy levels cause the raised the impact failures of all composites. However, internal pressurization decreased the amount of failures.