SYMPOSIA PAPER Published: 01 January 1977
STP27974S

Effect of Temperature on Fatigue Response of Surface-Notched [(0/ ± 45/0) ] Graphite/Epoxy Laminate

Source

The fatigue behavior of surface-notched [(0/± 45/0)s]3 T300/5208 graphite-epoxy specimens was studied over the temperature range from room temperature to 421 °F (216 °C). The specimens, after being subjected to two lifetimes of a 135 000-cycle tension-dominated flight-by-flight spectrum, were nondestructively inspected (using tetrabromoethane-enhanced X-ray radiography and C-scanning) and then tested at room temperature to determine their residual strengths. The test results show that both the extent of matrix damage and residual strengths increase with fatigue test temperature. If the fatigue-induced matrix damage region (FIMDR) is the same size or smaller than the delamination region observed prior to static failure, then the residual and static strengths are equal. If the FIMDR is larger than the delamination prior to static failure, then the residual strength is higher than the static strength. Finally, the residual strength is less than the net section strength.

Author Information

Sendeckyj, GP
Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio
Stalnaker, HD
Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio
Kleismit, RA
Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio
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Details
Developed by Committee: D30
Pages: 123–140
DOI: 10.1520/STP27974S
ISBN-EB: 978-0-8031-4708-9
ISBN-13: 978-0-8031-0347-4