Accession Number:

ADA066649

Title:

Damage Mechanisms and Failure of 3-D Carbon-Carbon Composites.

Descriptive Note:

Interim rept. Aug 77-Aug 78,

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TEX

Personal Author(s):

• Francis,Philip H.
• Robinson,Craig T.

Report Date:

1979-02-01

Pagination or Media Count:

93.0

Abstract:

Mechanical property characterization tests were conducted on specimens from a three-dimensional, cartesian orthogonally woven carbon-carbon C-C material. Tests consisted of tensile and rail shear, which were conducted at room temperature, and compression tests conducted at room temperature up to 2165 C 3930 F. Stress-strain characteristics and acoustic emission instrumentation were employed to infer the mechanics of the fracture initiation process. In addition, a specially developed axial loading stage integral to SwRIs ETEC scanning electron microscope facility was used to view and videotape the crack initiation and development processes. As a result of these studies, a tentative model is described to explain the mechanics of failure in 3-D C-C composites. Author

Descriptors:

• *CRACKING(FRACTURING)
• *CARBON CARBON COMPOSITES
• *FAILURE(MECHANICS)
• COMPRESSION
• THERMOMECHANICS
• STRESS STRAIN RELATIONS
• TENSILE STRESS
• ELECTRONIC SCANNERS
• FRACTURE(MECHANICS)
• ELECTRON MICROSCOPY
• FRACTOGRAPHY
• THREE DIMENSIONAL
• SHEAR STRESSES
• ACOUSTIC EMISSIONS

Subject Categories:

• Laminates and Composite Materials
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE