Accession Number : ADP004704

Title :   Damping Behavior of Metal Matrix Composites,

Corporate Author : MARTIN MARIETTA AEROSPACE DENVER CO

Personal Author(s) : Misra,M. S. ; LaGreca,P. D.

Report Date : NOV 1984

Pagination or Media Count : 13

Abstract : Discontinuous and continuous fiber reinforced composites were evaluated for their damping capacities and elastic moduli. In the case of graphite/aluminum and graphite/magnesium, the damping factor increases significantly in the transverse direction and slightly in the longitudinal direction whereas the longitudinal elastic modulus of the composite has increased by a factor of 3 or more. The damping behavior of the SiC particulate reinforced aluminum composite was similar to that of the matrix aluminum alloy. Efforts were made to explain the observed behavior to the fiber matrix and the diffusion bonded interfaces present in these composites. If the interface strength is higher than that of the matrix alloy, the damping capacity remains the same. However, if the interfaces are the weaker areas, i.e., areas of metallurgical imperfection, the damping capacity increases. (Author)

Descriptors :   *DAMPING, *METAL MATRIX COMPOSITES, *FIBER REINFORCED COMPOSITES, TEST AND EVALUATION, MODULUS OF ELASTICITY, STRUCTURES, INTERFACES, ALUMINUM ALLOYS, GRAPHITE, MAGNESIUM ALLOYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE