โ Scribed by R. Taggart; M. Ramulu; T. Jolly
No coin nor oath required. For personal study only.
The crack growth characteristics of physically short cracks have been examined under cycfic load conditions. These short cracks were nucleated from artificial flaws that had been induced symmetrically in a keyhole-notched compact-type specimen of aluminum alloy 7075-1735. The fatigue crack growth rate is shown to be a function of flaw depth. A fimit to short-crack behavior is predicted in terms of flaw depth. A transition from short-to long-crack behavior is observed for crack lengths between 1.0 and 3.0 ram. The effect of residual stresses created by the introduction of the artificial flaw is discussed. Fatigue crack morphology in terms of microstriations and flaw depth is also considered.
๐ SIMILAR VOLUMES
The indentation crack has been used as a model of surface flaw in the strength tests of ceramics. In evaluation of such strength properties, some attention should be paid to the residual stress effect due to indentation. In this study, fatigue crack growth behavior from indentation flaws was investi