Two types of composite fibers were compared, basalt and carbon fibers. At high loads, the composite reinforcement is found to effectively support the metal tube when the steel material approaches plastic yielding.
This phenomenon has been clearly visualized by AE signals, appearing in the frequency range between 280kHz and 450kHz. It was concluded, that cheaper basalt roving can be safely used in the analyzed application.
Tomasz Nowak, Jerzy Schmidt, Ireneusz Baran.