Accession Number:

ADA003321

Title:

Fatigue Testing Techniques for Evaluating the Effects of Environment on Composite Materials

Descriptive Note:

Technical note

Corporate Author:

ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LAB FORT EUSTIS VA EUSTIS DIRECTORATE

Personal Author(s):

Report Date:

1974-10-01

Pagination or Media Count:

16.0

Abstract:

Composite materials are finding an increasing usefulness in aircraft structures which are subject to long-term, uncontrolled weathering conditions. In order to obtain data that are representative of actual operating conditions, cantilever bending fatigue testing of plus or minus 45F fiberglass epoxy specimens and graphite epoxy composite specimens was initiated on outdoor and indoor test equipment. After trying several unsuccessful modifications to the test procedure, it became obvious that state-of-the-art, metal testing techniques did not yield valid data. It was decided to abandon the free-vibration approach. An indoor shaker table was modified to produce a fixed deflection on the specimen with a system of actuator arms. Tests were run to determine the fatigue life at different magnitudes of deflection using this system, and they proved to be successful.

Subject Categories:

  • Aircraft
  • Laminates and Composite Materials
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE