Accession Number : AD0877040

Title :   Metal Matrix Composite Technology.

Descriptive Note : Interim technical rept. 1 Jul 69-30 Jun 70,

Corporate Author : UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT

Personal Author(s) : Kreider, Kenneth G. ; Dardi, L. E. ; Prewo, K. M.

Report Date : JUL 1970

Pagination or Media Count : 151

Abstract : The primary emphasis of the report pertains to the metal matrix composite system aluminum plus boron fiber with a protective coating. Alloys and fibers have been considered which are deemed most useful for aerospace applications. Further research and development will concentrate on composite systems for higher temperature application. It was found that, although environmental attack by salt water could be characterized by the matrix properties, degradation of properties at high temperatures in air (700C) were better related to the fibers. The transverse strength of boron-aluminum was related for the most part to the problem of fiber splitting and such effects as matrix, heat treatment, volume fraction fiber, test temperature, test specimen configuration, fiber properties, and secondary reinforcement were studied. Axial, transverse, and cross-ply composites were studied in low-cycle fatigue tests. Charpy 'V' notch bend tests and center-notched tensile tests were investigated to determine the effect of stress concentration factors and general fracture behavior. (Author)

Descriptors :   *COMPOSITE MATERIALS), *REINFORCING MATERIALS), (*ALUMINUM, (*BORON, PERFORMANCE(ENGINEERING), TEST METHODS, FIBERS, SEA WATER, DEGRADATION, FATIGUE(MECHANICS), IMPACT TESTS, FRACTURE(MECHANICS), NONDESTRUCTIVE TESTING, ALUMINUM ALLOYS, SILICON CARBIDES, MECHANICAL PROPERTIES.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE