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Fatigue life estimation of graphite/epoxy laminates under consideration of delamination growth
Author(s) -
Bergmann H. W.,
Prinz R.
Publication year - 1989
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.1620270208
Subject(s) - epoxy , delamination (geology) , materials science , buckling , composite material , tension (geology) , graphite , compression (physics) , stacking , composite laminates , structural engineering , strain energy release rate , fracture mechanics , composite number , engineering , geology , paleontology , physics , nuclear magnetic resonance , subduction , tectonics
A closed form approach to the assessment of the fatigue life of graphite/epoxy laminates under cyclic tension–compression loading has been developed. The model is mechanistic and uses cyclic energy release rates for prediction of delamination growth and of critical delamination sizes which induce buckling and the final failure of the laminates. Tests performed with graphite/epoxy specimens of stacking order [0 n , ϕ m ] s with severed central plies [ϕ], and of stacking order [0 2 , +45, 0 2 , −45, 0, 90] s with a central unloaded hole, indicate good correlation between estimated values and observed delamination growth, critical buckling strength of separated plies and load cycles to failure.