Abstract:
In accordance with the present invention an aircraft floor panel (14) is provided comprising a honeycomb core element (16) having an upper core surface (20), a lower core surface (22), and a core thickness (18). An upper face sheet assembly (36) is mounted to and seals the upper core surface and includes at least one upper material sheet (38) impregnated with an upper epoxy resin (40). A lower damping face sheet assembly (24) is mounted to and seals the lower core surface and includes at least one lower material sheet (26) infused with a highly damped lower epoxy resin (28). The lower damping face sheet assembly dampens vibrational noise.
Abstract:
Composite laminates used in structural applications include an interlayer of soft material that provides damping action to reduce noise and vibration. The interlayer may comprise a viscoelastic material which deforms under stress caused by shock, noise or vibration. A reinforcement may be embedded in the viscoelastic material to maintain the mechanical strength and stiffness of the laminate. The reinforcement may include individual or woven fibers or ridged tubes that provide the interlayer with stiffness.
Abstract:
A damped composite structure is formed from a matrix material and a plurality of shape memory alloy wire fibers held in the material matrix for damping the structure. The wire fibers may be embedded in a viscoelastic interlayer to increase damping of the structure. The wire fibers may be interspersed with reinforcement such as carbon fibers, in tows or in a mesh of fibers. The wire fibers have an inherent material loss factor greater than approximately 0.10, and may be formed from superelastic metal alloys, such as Ni-Ti, Cu-Zn-Al, Cu-Al-Ni, OR Cu-Al-Be.
Abstract:
Composite laminates used in structural applications include an interlayer of soft material that provides damping action to reduce noise and vibration. The interlayer may comprise a viscoelastic material which deforms under stress caused by shock, noise or vibration. A reinforcement may be embedded in the viscoelastic material to maintain the mechanical strength and stiffness of the laminate. The reinforcement may include individual or woven fibers or ridged tubes that provide the interlayer with stiffness.