The effect of z-pinning on the fatigue strength of unidirectional carbon/epoxy composites under cyclic tensile or compressive loading is determined. Experimental testing revealed that z-pinning degrades the elastic modulus, ultimate strength and fatigue strength of composites in tension or compression. The tensile fatigue strength is degraded by damage due to z-pinning, particularly fiber dilution caused by swelling, fiber breakage and resin-rich zones. The reduction to the compressive fatigue strength is attributed to laminate swelling and fiber distortion, which lowers the compressive stress required to cause failure by fiber kinking. Data presented in the paper reveals that the adverse affect of z-pinning on the fatigue strength could be minimized by using very fine pins.
Fatigue properties of z-pinned aircraft composite materials
Ermüdungseigenschaften von z-verstifteten Flugzeug-Verbundwerkstoffen
2006
8 Seiten, 7 Bilder, 2 Tabellen, 8 Quellen
Aufsatz (Konferenz)
Englisch
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