Frequency and load ratio effects on critical strain energy release rate Gc thresholds of graphite/epoxy compositesGraphite/epoxy composite laminates of T300/BP907 and AS6/HST-7 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 was monitored as a function of number of fatigue cycles 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.
Document ID
19870061270
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Adams, Donald F. (Wyoming, University Laramie, United States)
Zimmerman, richard S. (General Electric Co. Albuquerque, NM, United States)
Odom, Edwin M. (Wyoming Univ. Laramie, WY, United States)