Accession Number:

ADA000494

Title:

The Mechanical Properties of Metal Matrix Composites Subjected to Cyclic Temperature Changes.

Descriptive Note:

Final rept. 1 Jul 73-30 Jun 74,

Corporate Author:

TENNESSEE UNIV SPACE INST TULLAHOMA DEPT OF METALLURGICAL ENGINEERING

Personal Author(s):

• Wright,Maurice A.

Report Date:

1974-10-01

Pagination or Media Count:

66.0

Abstract:

The mechanical properties of 6061 aluminum reinforced with fibers of stainless steel, 34 vo SiC, 27 vo boron and 45 vo boron cross-piled 090 and plus or minus 45, were determined in the as-received condition and after thermal cycling. The properties investigated included longitudunal and transverse strength and modulus, major and minor Poissons ratio, the density and the fracture toughness. The cyclic temperature limits were maintained at room temperature and 425c and a constant 6000 cycles were used in all tests. It was concluded that the nature of the damage consisted of voids and cracks that were solely connected with the matrix or matrix-fiber bond. It was noted that increasing damage became apparent as the cyclic frequency decreased indicating that the time that the specimen remained at elevated temperature seriously influenced the resulting mechanical properties. Modified author abstract

Descriptors:

• *FIBER REINFORCED COMPOSITES
• *FRACTURE(MECHANICS)
• *THERMAL FATIGUE
• MECHANICAL PROPERTIES
• ALUMINUM ALLOYS
• STAINLESS STEEL
• BONDING
• BORON
• SILICON CARBIDES
• THERMAL CYCLING TESTS
• POISSON RATIO

Subject Categories:

• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE