Preliminary Report on Super Composite Beam and Split Cylinder Experiments

摘要: Abstract : These experiments had two main objectives: (1) explore and demonstrate whether the bending- extension (b-e) coupling effect of graphite/epoxy two-layered cross-ply laminate has potential to substantially improve (e.g., reduce fundamental natural frequencies of) low-frequency, wall-driven composite projectors (such as slotted cylinder projector), (2) provide experimental data confirm theoretical predictions (made with previously derived analytical solutions) on b-e coupled beams simple supports. Vibration tests were conducted flat curved shapes bare-beam actuator-beam specimens, near-symmetric laminated composites. All specimens tested free vibration, whereas all forced vibration. Additionally, in both simply-supported free-free boundary conditions, only conditions (due setup current testing fixtures for supports).