Effects of fatigue and environment on residual strengths of center-cracked graphite/epoxy buffer strip panels

Journal Article · Wed Mar 01 04:00:00 EST 1989 · Experimental Mechanics; (USA)

DOI:https://doi.org/10.1007/BF02327788· OSTI ID:5611549

Bigelow, C A ^[1]

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1. NASA, Langley Research Center, Hampton, VA (USA)

The effects of fatigue, moisture conditioning, and heating on the residual tension strengths of center-cracked graphite/epoxy buffer strip panels were evaluated using specimens made with T300/5208 graphite epoxy in a 16-ply quasi-isotropic layup, with two different buffer strip materials, Kevlar-49 or S-glass. It was found that, for panels subjected to fatigue loading, the residual strengths were not significantly affected by the fatigue loading, the number of repetitions of the loading spectrum, or the maximum strain level. The moisture conditioning reduced the residual strengths of the S-glass buffer strip panels by 10 to 15 percent below the ambient results, but increased the residual strengths of the Kevlar-49 buffer strip panels slightly. For both buffer strip materials, the heat increased the residual strengths of the buffer strip panels slightly over the ambient results. 6 refs.

• OSTI ID: 5611549
• Journal Information: Experimental Mechanics; (USA), Journal Name: Experimental Mechanics; (USA) Vol. 29; ISSN EXMCA; ISSN 0014-4851
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ARAMIDS
CARBON
CRACKS
ELEMENTAL MINERALS
ELEMENTS
ENVIRONMENT
EPOXIDES
FATIGUE
GLASS
GRAPHITE
HEATING
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MOISTURE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PANELS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
SYNTHETIC MATERIALS
TENSILE PROPERTIES