Fatigue Properties of Multidirectional Braided Composites

The fatigue performance of graphite/epoxy composites manufactured using a general braiding process was evaluated. Two styles of braided composites were fabricated and tested. Style I was the basic (1 x 1) braid pattern. Style II was constructed by holding half of the yarns as straight columns and br...

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Bibliographic Details
Main Authors: Gause,L W, Alper,J M, Dalrymple,R H
Format: Report
Language:English
Subjects:
Braided composites
BRAIDS
DIRECTIONAL
EPOXY COMPOSITES
FABRICS
FATIGUE LIFE
GRAPHITED MATERIALS
Laminates and Composite Materials
PATTERNS
PE61153N
THREE DIMENSIONAL
WUDN133126
YARNS
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Summary:The fatigue performance of graphite/epoxy composites manufactured using a general braiding process was evaluated. Two styles of braided composites were fabricated and tested. Style I was the basic (1 x 1) braid pattern. Style II was constructed by holding half of the yarns as straight columns and braiding the rest of the yarns about the fixed yarns. Performance was compared to a 24 ply conventional laminate. Tension-tension, compression-compression and fully reversed constant amplitude fatigue tests were performed. Both style braids exhibited similar behavior, except style II had longer compression-compression fatigue life. As expected, in all fatigue conditions the braids had shorter lives than the baseline laminate. Non the less, the fatigue threshold stress levels observed for the braids as a percent of ultimate strength were similar to current laminated construction design stress values. Keywords: Graphite epoxy composites; Three dimensional fabric; Fatigue(Materials).