Development of damped metal-matrix composites for advanced structural applications. Technical report
The development of damped metal matrix composite structures for advanced applications has been investigated by the use of two different approaches: (1) the development of metal matrix composites with high intrinsic damping compared to that of the matrix material, and (2) the development of coated metal matrix composites with high structural damping compared to that of the composite substrates. The two different approaches are analyzed in terms of their potential for improved damping and feasibility for structural applications. Damping was measured by the transverse vibration of free-free beams using the bandwidth technique by a laser vibrometer under ambient conditions. The damping measurements were made over a wide range of frequencies (.7 kHz to 25.6 kHz) at low strain amplitudes (10 to the -10 power to 10 to the -7 power). Materials investigated for their tensile stiffness, strength, and damping performance include mechanically alloyed (MA) Aluminum-Magnesium, SiC(p)/Aluminum-Copper (MA), SiC(p)/AL, AL2O3(p)/AL, SiC(W)/AL, planar random Gr/AL, unidirectional Gr/AL and unidirectional SiC(Nicalon)/AL composites. The effects of coatings of high damping metals (nitinol and incramute) on 6061-T6 AL and AL2O3(p)/AL substrates have also been studied. The AL-Mg (MA), SiC(p)/AL (MA), SiC(W)/AL and th AL2O3(p)/AL composites show no significant improvement in damping compared with that of the 6061-T6 AL.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (USA). Applied Research Lab.
- OSTI ID:
- 7023716
- Report Number(s):
- AD-A-219864/6/XAB; ARL/PSU/TR--90-004
- Country of Publication:
- United States
- Language:
- English
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Cermets
& Refractories-- Physical Properties
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ALKALINE EARTH METALS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBIDES
CARBON COMPOUNDS
CERMETS
CHALCOGENIDES
COATINGS
COMPOSITE MATERIALS
COPPER
DAMPING
DOCUMENT TYPES
ELEMENTS
MAGNESIUM
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
MECHANICAL VIBRATIONS
METALS
NICKEL ALLOYS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PARTICULATES
POWDERS
PROGRESS REPORT
SILICON CARBIDES
SILICON COMPOUNDS
SUBSTRATES
TENSILE PROPERTIES
TITANIUM ALLOYS
TRANSITION ELEMENTS