Topic
Vibration fatigue
About: Vibration fatigue is a research topic. Over the lifetime, 3460 publications have been published within this topic receiving 46297 citations.
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TL;DR: In this article, the design of a displacement-controlled high-cycle fatigue and corrosion fatigue machine is discussed, which allows the simultaneous testing of more than one test specimen and can be selected individually; the frequency however is the same for each test specimen.
Abstract: The design of a new and simple displacement-controlled high-cycle fatigue and corrosion fatigue machine is discussed. The new design allows the simultaneous testing of more than one test specimen. Stress amplitudes and mean stresses can be selected individually; the frequency however is the same for each test specimen.
19 citations
TL;DR: In this article, a physically based fatigue life calculation method called PHYBAL was developed, which requires data of only three fatigue tests for a rapid and nevertheless precise determination of Woehler curves for constant amplitude loading or fatigue life curves for random loading.
Abstract: Mechanical stress-strain hysteresis, temperature and electrical resistance measurements were performed to characterize the fatigue behavior and to calculate the lifetime of metals under constant amplitude loading and random loading. Constant amplitude sequences were periodically inserted in random load tests to measure the plastic strain amplitude as well as the deformation-induced changes in specimen temperature and electrical resistance. These data are plotted versus the number of cycles for the fatigue assessment under random loading, similar as commonly practiced under constant amplitude loading. On the basis of Morrow and Basquin equations in generalized formulations, to be applicable for mechanical, thermal and electrical measurement techniques, a physically based fatigue life calculation method “PHYBAL” was developed. This new short-time procedure requires data of only three fatigue tests for a rapid and nevertheless precise determination of Woehler curves for constant amplitude loading or fatigue life curves for random loading.
19 citations
TL;DR: In this article, the impact of non-Gaussian and non-stationary loadings on the service life of a mechanical component is known, even if in fatigue application it is common to assume stationary and Gaussian excitation.
19 citations
TL;DR: In this paper, the use of fatigue notch factors is proposed for specifying the relationship between the allowable stress range and the number of loading cycles, and the proposed equations for redundant load path structures give stress range values closer to those corresponding to the lower confidence limit at two standard deviations of the mean than the rounded off values in the specifications.
Abstract: The use of fatigue notch factors is proposed for specifying the relationship between the allowable stress range and the number of loading cycles. This is done by premultiplying the stress range with a fatigue notch factor which accounts for the severity of the detail’s stress concentration. The method simplifies the manner in which fatigue specifications are written, and it conveys the idea of classification of details by severity of stress concentrations; it is most suitable for use in computer-aided analysis and design. The proposed equations for redundant load path structures give stress range values closer to those corresponding to the lower confidence limit at two standard deviations of the mean than the rounded off values in the specifications. The proposed equations for nonredundant load path structures are set at a uniform 5.5 standard deviations below the mean.
19 citations
TL;DR: In this paper, an attempt is made to extend the total strain energy approach for predicting the fatigue life subjected to mean stress under uniaxial state The effects of means stress on the fatigue failure of a ferritic stainless steel and high pressure tube steel are studied under strain-controlled low cycle fatigue condition.
Abstract: In this paper, an attempt is made to extend the total strain energy approach for predicting the fatigue life subjected to mean stress under uniaxial state The effects of means stress on the fatigue failure of a ferritic stainless steel and high pressure tube steel are studied under strain-controlled low cycle fatigue condition Based on the fatigue results from different strain ratios, modified total strain energy density approach is proposed to account for the mean stress effects The proposed damage parameter provides convenient means of evaluating fatigue life with mean stress effects considering the fact that the definitions used for measuring strain energies are the same as in the fully-reversed cycling (R = −1) A good agreement is observed between experimental life and predicted life using proposed approach Two other mean stress models (Smith-Watson-Topper model and Morrow model) are also used to evaluate the low cycle fatigue data Based on a simple statistical estimator, the proposed approach is compared with these models and is found realistic
18 citations