The Effect of Environment on the Mechanical Behavior of AS/3501-6 Graphite/Epoxy Material
Final rept. 1 Sep 1978-31 Aug 1979 on Phase 2
VOUGHT CORP ADVANCED TECHNOLOGY CENTER DALLAS TX
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The effect of temperature and moisture on the fatigue properties of AS3501-6 composite was explored. This includes the design of a fatigue specimen, its fabrication procedure, displacement and temperature monitoring technique, and analysisdata correlation. The specimens used were of layup 90 sup 20 and or - 45 sub 2S. The fatigue load ratio was set at 0.1 and the cyclic frequency was set at three hertz. No appreciable heat was generated in the 90 deg specimen during fatigue. The or - 45 specimens experienced appreciable temperature increases at various environments. Test data from a fatigue tension test was generated to supplement the analysis of predicting the temperature distribution in the specimen due to continuous heat generation experienced by the or - 45 deg specimen. A probabilistic fatigue model derived from the concept of crack propagation in viscoelastic material was used for the data analysis. The temperature effect and moisture effect was accounted for by this analysis model.
- Laminates and Composite Materials