Digital Repository, CP2006

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Fretting damage influence of the fatigue crack initiation and growth in High-Cycle- and Very-High-Cycle-Fatigue areas of peened and unpeened Al-based alloys
A. Shanyavskiy, M. Artamonov, M. Artamonov

Last modified: 2013-03-11

Abstract


In-service fretting damage influenced the fatigue crack origination inmaterials under the damaged surface for the very-high-cycle fatigue. Specimens of BSL65 Al-Cu alloy with peened and unpeened surfaces tested under cyclic tension andstatic compression had the crack initiation on the surface because of fretting damage.The static compression was used to reproduce the fretting damage on the specimensurface. The special methodology was applied to the crack growth analysis in the caseof the biaxial stress-state with R=-1.0 for the investigated material. The frettinginfluence on the fatigue crack propagation was estimated on the basis of the functionalcorrection, F( fr) , for the stress intensity factor, KI. The fretting damage influence onthe fatigue crack growth have been briefly discussed on the basis of the kinetic curvesreproduced from the fractographic analysis and the Wöhler diagram describedmaterials behaviour in high- and very-high-cycle fatigue areas.

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