Accession Number:

ADA067289

Title:

Certification of Composite Aircraft Structures Under Impact, Fatigue and Environmental Conditions. Part III. Environmental Effects on Compressive Strength.

Descriptive Note:

Final rept. 1 Jul 76-31 Dec 77,

Corporate Author:

DREXEL UNIV PHILADELPHIA PA

Personal Author(s):

• Wang,Albert S. D.

Report Date:

1978-01-01

Pagination or Media Count:

93.0

Abstract:

The compressive behavior of a graphiteepoxy AS-3501-6 composite system is studied here experimentally and analytically. First, a test method is developed using a flat-end specimen. Tests are then performed for six 6 different composite laminates. In each case, the variation of the test temperature ranges from -12 C to 121 C while the variation of the moisture content in the specimens ranges from dry to saturated-wet. Two cases of drywetdry conditioned specimens are also studied. An analytical model which is based on the concept of microbuckling is developed to predict the compression strength of unidirectional laminates. The analytical results compare well with experiment. The rule-of-mixture method is shown to predict the compressive strength of laminates of complex lay-ups. Author

Descriptors:

• *COMPOSITE MATERIALS
• *AIRFRAMES
• MATHEMATICAL MODELS
• TEMPERATURE
• MICROSTRUCTURE
• LAMINATES
• TEST METHODS
• GRAPHITE
• BUCKLING
• EPOXY RESINS
• HUMIDITY
• COMPRESSIVE PROPERTIES
• UNIDIRECTIONAL
• FLAT PLATE MODELS

Subject Categories:

• Aircraft
• Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE