Accession Number:

AD0837237

Title:

ANALYTICAL APPROACH TO COMPOSITE BEHAVIOR.

Descriptive Note:

Summary technical rept. 1 Mar 67 - 28 Feb 68,

Corporate Author:

CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF METALLURGY

Personal Author(s):

• Ebert, L. J.
• Hamilton, C. H.
• Hecker, S. S.

Report Date:

1968-03-01

Pagination or Media Count:

206.0

Abstract:

The residual stresses, which result from dissimilar thermal expansions of the components of composites, were determined experimentally on cylindrical model composites of two different systems 1 OFHC Copper core with a 4340 steel case. 2 OFHC Copper core with an 18 Ni maraging steel case. These stresses were determined by the Sachs Boring-Out method, in which axial and tangential surface strains were measured during the boring process. These residual stresses have been considered in the analytical predictions of stress-strain behavior of the composites. The effect of pre-straining on the residual stress states and on subsequent stress-strain behavior of the cylindrical model composites, as well as on tungsten fiber - copper matrix fiber composites, was investigated. The high residual stresses, which were found to be present as a result of thermal processing, were sufficiently altered by pre-straining to cause a substantial increase in the stress-strain curve on reloading. Author

Descriptors:

• *COMPOSITE MATERIALS
• STRESSES
• THERMAL STRESSES
• MATHEMATICAL MODELS
• CYLINDRICAL BODIES
• STEEL
• COPPER ALLOYS
• STRAIN(MECHANICS)
• SYNTHETIC FIBERS
• METALLIC TEXTILES
• INTERACTIONS
• MODULUS OF ELASTICITY
• RHEOLOGY
• MICROSTRUCTURE
• FILAMENTS
• TENSILE PROPERTIES
• MARAGING STEELS
• CREEP
• STRAIN HARDENING
• NICKEL ALLOYS
• TUNGSTEN ALLOYS
• LOADS(FORCES)

Subject Categories:

• Laminates and Composite Materials
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE