Experimental Study on Rainforced Circular Copper Tubes by Carbon/EpoxyComposite Tubes under the Axial Loading

This paper investigates the axial compression process of the multi-layered tubes with the circular crosss-section under the axial loading in the quasi-static condition by the experimental methods. The specimens were prepared in five different groups: empty carbon/epoxy composite tubes, empty copper tubes, silicon sealant filled composite tubes, copper tubes comprised of filled silicon sealantcarbon/epoxy composite tubes with also silicon sealant filler in between and copper tubes filled by empty composite tubes with silicon sealant filler in between. For each test, diagrams of the axial loaddisplacement and absorbed energy-displacement were sketched and also, the specific absorbed energy by each specimen was measured. The experiments show that filling the copper tube by the composite tubes and also, filling the carbon/epoxy composite tubes by the silicon sealant increase the instantaneous axial load and therefore, the energy absorption capability of the structure. Then, by comparing the experimental measurements in veiwpoints of energy absorption capacity and specificabsorbed energy, an optimum sample is introduced. Furthermore, the effects of geometrical characteristics of the composite and copper tubes such as the tube diameter and also, the different filling conditions are investigated, based on the axial compression tests. The experiments show that the absorbed energy of the circular copper tubes that were filled by the carbon/epoxy compsoite tubes is higher than the alone copper tubes. Also, it was found that the copper tubes has the less absorbed energy per unit of mass, comparing with the empty carbon/epoxy composite tubes and also, the filled composite tubes by the silicon sealant.

کلیدواژه ها:

Carbon/epoxy Composite Tubes ، Energy Absorption ، Circular Aopper Tubes ، AxialCompression ، Silicon Sealant