SYMPOSIA PAPER
Published:
01 January 1987
STP24381S
Frequency and Load Ratio Effects on Critical Strain Energy Release Rate Thresholds of Graphite/Epoxy Composites
SourceGraphite/epoxy composite laminates of T300/BP907 and AS6/HST-7 in layup orientations of [±35/0/90]s and [±302/90/¯9¯0]s were axial tension fatigue tested. Tests were conducted at 5 and 10 Hz, and at loading ratios of R = 0.1 and R = 0.5. Edge delamination as a function of number of fatigue cycles was monitored by monitoring stiffness reduction during fatigue testing. Delamination was confirmed and documented using dye-enhanced X-ray and optical photography. Critical strain energy release rates were then calculated. The composites delaminated readily, with loading ratio having a significant influence. Frequency effects were negligible.
Author Information
Adams, DF
University of Wyoming, WY
Zimmerman, RS
University of Wyoming, WY
Odom, EM
General Electric Corp., Albuquerque, NM
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Details
Developed by Committee: D30
Pages: 242–259
DOI: 10.1520/STP24381S
ISBN-EB: 978-0-8031-5002-7
ISBN-13: 978-0-8031-0934-6