Metallurgical Characterization of the Interfaces and the Damping Mechanisms in Metal Matrix Composites.
Abstract
High inherent damping is a material property requirement to meet the need for dynamic dimensional precision and weight savings in space structures. A preliminary investigation indicates that MMC exhibit improved damping with respect to conventional structural alloys of aluminum or titanium. In the present investigation, a graphite-aluminum composite (P55/6061) has been selected to study the microstructural features and mechanisms responsible for damping in MMC. During this investigation, methodology to measure damping by clamped free flexure and uniaxial tension-tension test techniques were developed. Work conducted within the reporting period: (1) Preliminary results with free-free flexure indicate that this method can be used sucessfully to measure damping in metal matrix composites; (2) TEM of Gr/Al composites show that the dislocations adjacent to the fiber matrix interface are thermal expansion mismatch of th fiber and matrix during the fabrication process; (3) Strain amplitude dependent damping is the result of dislocation motion and correlates well with the Granato-Lucke theory of dislocation damping.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1986
- Accession Number
- ADA173470
Entities
People
- Mohan S. Misra
Organizations
- Martin Marietta