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- W2049432046 abstract "Direct observation of compressive fatigue of pre-notched unidirectional graphite fibre composites reveals that fatigue cracking extends transverse to the fibre direction, via micro-buckling. An elasto-plastic-strain hardening model of the material behaviour, based on experimental measurements of material properties, is used, together with a finite element computation, to obtain the stress and strain distribution near the notch tip. The calculated radius (Rp) of the plastic zone at the notch tip is shown to correlate with the observed fatigue crack propagation rates (dc/dN) via: dcdN = 105Rp6 (in/cycle) Fatigue cracking is seen to decelerate with crack extension, indicating a residual bearing strength of newly-generated compressive fracture surfaces of approximately 104 psi. The implications of compressive fatigue in composites design are discussed. It is pointed out that prevention of axial cracking in the composite is a key element in preventing compressive fatigue" @default.
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- W2049432046 date "1973-04-01" @default.
- W2049432046 modified "2023-10-16" @default.
- W2049432046 title "Fatigue of graphite fibre-reinforced epoxy in compression" @default.
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- W2049432046 doi "https://doi.org/10.1016/0015-0568(73)90001-8" @default.
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