Accession Number : ADA325795

Title :   Certification of Composite Aircraft Structures Under Impact, Fatigue and Environmental Conditions. Part 3. Environmental Effects on Compressive Strength.

Descriptive Note : Final contract rept. 1 Jul 76-31 Dec 77,

Corporate Author : DREXEL UNIV PHILADELPHIA PA

Personal Author(s) : Wang, Albert S.

PDF Url : ADA325795

Report Date : JAN 1978

Pagination or Media Count : 94

Abstract : The compressive behavior of a graphite/epoxy (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 dry/wet/dry 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.

Descriptors :   *COMPOSITE MATERIALS, *COMPRESSIVE STRENGTH, *GRAPHITE EPOXY COMPOSITES, THERMAL PROPERTIES, GRAPHITE, MOISTURE CONTENT, BUCKLING, RANGE(EXTREMES), TEST FACILITIES, COMPOSITE AIRCRAFT.

Subject Categories : Laminates and Composite Materials
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE