Accession Number:

AD0856255

Title:

Flaw Point and Dynamic Microphotoelasticity Investigation

Descriptive Note:

Final rept. 24 Jan 1968-19 Feb 1969

Corporate Author:

ROCKETDYNE CANOGA PARK CA

Personal Author(s):

• Caputo, Angelo A.
• Hilzinger, John E.

Report Date:

1969-06-01

Pagination or Media Count:

69.0

Abstract:

The effects of load-induced flaws and preexisting flaws on the initiation and propagation of fracture in glass- and graphite-fiber-reinforced composites were studied, utilizing a birefringent epoxy resin matrix with relatively wide-spaced unidirectional and simple cross-ply fiber configurations, and combining photoelastic and high-speed photographic techniques. A broad, qualitative investigation was made to characterize differences in behavior as functions of ply type and orientation, fiber identity, type of flaw, and manner of loading. Specimens were examined under simple static tension, biaxial static compression-tension and tension-tension, cyclic tension, and dynamic impact, in all cases at room temperature.

Descriptors:

• *COMPOSITE MATERIALS
• CARBON FIBERS
• CRACK PROPAGATION
• DEFECTS(MATERIALS)
• DETECTION
• EPOXY RESINS
• FAILURE(MECHANICS)
• FRACTURE(MECHANICS)
• GLASS TEXTILES
• IMPACT TESTS
• LAMINATED PLASTICS
• LIFE EXPECTANCY(SERVICE LIFE)
• PHOTOELASTICITY
• TENSILE PROPERTIES

Subject Categories:

• Laminates and Composite Materials
• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE