Reconsidering the Role of Fatigue Irregular Testing in Scientific Conclusions About the Fatigue Limit

Abstract

We propose using the irregular loading fatigue testing to study the cru-cial topics of the subject, for instance, concerning the fatigue limit. Thischaracteristic is important to know (1) for test accelerating; (2) To guar-antee stable, reliable service. Comparative studies under block and randomloading present an opportunity to draw conclusions without the ultra-soundfrequencies loading, which are at some extend controversial. We presentan example of proposed method application. The second stage of fatigue –namely, the crack propagation stage, is also considered (in reference). Therethe main idea is similar – the irregular testing provides an opportunity tojudge about the maxim among the small amplitudes, which are not harmful.Direct experimental estimation of true fatigue limit requires the testing underultra-sound frequencies, which is not under the questions nowadays