Comparison of different statistical models for description of fatigue including very high cycle fatigue |
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| Affiliation: | 1. University of Applied Sciences, Faculty of Mechanical and Plastics Engineering, Schöfferstr. 3, 64295 Darmstadt, Germany;2. Universidad de Oviedo, 33203 Gijon, Spain;1. Dept. of Construction and Manufacturing Engineering, EPI Gijón, University of Oviedo, 33203 Gijón, Spain;2. E.T.S. de Ingenieros de Caminos, C. y P., Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;3. E.T.S. de Ingeniería, Universidad de Sevilla, 41092 Sevilla, Spain;1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Xueyuan Road 37, Beijing, 100191, PR China;2. Beijing Key Laboratory of Fine Ceramics, Institute of Nuclear and New Energy Technology, Tsinghua University, Zhongguancun Street, Haidian District, Beijing 100084, PR China;1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Research Center of Advanced Materials Technology, Ritsumeikan University, Kusatsu 525-8577, Japan |
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| Abstract: | In this paper the fatigue behaviour of welded joints and helical compression springs are analysed using two different statistical models. The data consist of results from low cycle, high cycle and very high cycle fatigue and different number of investigated specimens. In particular, the software program ProFatigue is used for derivation of the probabilistic S–N field from experimental fatigue data. The program, based on a former regression Weibull model, allows the estimation of the parameters involved in the S–N field model, providing an advantageous application of the stress based approaches in the fatigue design of mechanical components. The results obtained are compared with the customary Wöhler-curve, represented as a straight line in a double-logarithmic scale. Application to probabilistic assessment of cumulative damage and further program enhancement can be now envisaged. |
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| Keywords: | ProFatigue Very high cycle fatigue Welded joints Helical compression springs |
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