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- W2116924391 abstract "The viability of a method for determining the fatigue life of composite rotor hub flexbeam laminates using delamination fatigue characterization data and a geometric non-linear finite element (FE) analysis was studied. Non-linear tapered flexbeam laminates of S2/E7T1 glass/epoxy, with internal ply drops, were tested in a hydraulic load frame under combined axial-tension and transverse cyclic bending. The first delamination damage observed in the specimens occurred at the area around the tip of the outermost ply-drop group. Subsequently, unstable delamination occurred by complete delamination along the length of the specimen. A 2D finite element model of the flexbeam was developed and a geometrically non-linear analysis was performed. The global responses of the model and test specimens agreed very well in terms of the transverse displacement. The FE model was used to calculate strain energy release rates (G) for delaminations initiating at the tip of the outer ply-drop area and growing toward the thick or thin regions of the flexbeam. Material characterization data from cyclic DCB tests was used with the peak calculated G values to generate a curve predicting fatigue failure by unstable delamination as a function of the number of loading cycles. The calculated fatigue lives compared well with the test data." @default.
- W2116924391 created "2016-06-24" @default.
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- W2116924391 date "1997-04-29" @default.
- W2116924391 modified "2023-10-04" @default.
- W2116924391 title "Fatigue Life Methodology for Tapered Composite Flexbeam Laminates" @default.
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