FATIGUE RESPONSE OF DOUBLE NOTCHED ALUMINIUM SPECIMENS LOADED UNDER UNIAXIAL STRESS

M. Vargas, M. Ruzicka, J. Papuga

Abstract

As part of an evaluation to determinate the influence of the stress gradient on the stress-life response of a given component, a series of double-notched samples was tested uniaxial stress-controlled fatigue tests. Its results were then compared with the results of similar tests made using single notch specimens. Although the inherent geometrical differences between the sample series, the stress concentration factors are in the range of 2.5 ± 10 % for all series. Nevertheless, the experimental results have shown a very different fatigue response of the double- notched series. To explain the aforementioned behavior, the authors have employed numerical simulation and a non-linear regression function to generate adjusted stress-life curves. The investigation shows, that is not enough to consider the stress concentration factor as main governing parameter, but also the stress gradient and the fatigue notch factor should be taken into account in order to narrow down non- conservative calculations when estimating lifetime.

Keywords

double-notched specimens, fatigue, aluminium 2124-T851, stress gradient

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DOI

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IMEKO TC

TC15 - Experimental Mechanics

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