SYMPOSIA PAPER Published: 01 January 1977
STP27978S

Fatigue Behavior of Composites Under Different Loading Modes

Source

The fatigue characteristics of S-glass/epoxy (Scoth-ply SP-250-SF1) and graphite/epoxy (Rigidite 5209-T300) laminates were studied for tension and shear loading. Emphasis was placed on fiber orientations where the matrix contribution to fatigue strength is significant. A general regression curve was used for data analysis, and a two-parameter Weibull model was used for reliability studies. An existing plane-stress macroscopic failure theory for static strength was extended to predict fatigue strength. It was found that the fatigue failure theory provides a conservative approach to first-ply failure which should be useful for preliminary design of composite structures.

Author Information

Sims, DF
Southwest Research Institute, San Antonio, Tex
Brogdon, VH
Bell Helicopter Textron, Fort Worth, Tex
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Details
Developed by Committee: D30
Pages: 185–205
DOI: 10.1520/STP27978S
ISBN-EB: 978-0-8031-4708-9
ISBN-13: 978-0-8031-0347-4