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Abstract
In this study, 16Mo3 steel was analysed for fatigue tests under tension-compression and oscillatory bending conditions. The analysis involved a comparison of fatigue test results obtained using the Manson-Coffin-Basquin, Langer and Kandil models and the models proposed by Kurek-Łagoda. It was observed that it is possible to substitute the basic tension-compression test performed in large testing machines with oscillatory bending tests carried out on a simple, modern test stand. The tests were performed under oscillatory bending on a prototype machine. The testing of 16Mo3 steel proved that the best-known Mason-Coffin-Basquin fatigue characteristic describes the results of all of the experimental tests very well, but the model can only be used when it is possible to divide strains into elastic and plastic components. It should be emphasised here that there is no such possibility in the case of tests performed under oscillatory bending conditions. It was proven that the proposed test method can substitute the tension-compression test very well and be a much more cost efficient way to obtain LCF material fatigue properties.
Highlights
The process of a structural material’s fatigue is an important topic in contemporary materials management
The 16Mo3 steel is a structural material that is widely used, in power engineering; it is the subject of the analysis described in this paper
The purpose of this work is to compare the test results for 16Mo3 steel using fatigue characteristics under tension-compression and oscillatory bending conditions according to different models
Summary
The process of a structural material’s fatigue is an important topic in contemporary materials management. A correct analysis of this steel in terms of strain and stress is important in both power engineering and the machine-building industry [1]. The purpose of this work is to compare the test results for 16Mo3 steel using fatigue characteristics under tension-compression and oscillatory bending conditions according to different models. In the cases of oscillatory bending and tension-compression, we obtain normal stresses as test results. It turns out that the fatigue strength characteristics for oscillatory bending and tension-compression are not the same. An analogous problem was identified by Hassan and Liu [8] They compared fatigue strengths using different methods of cyclic bending (rotational, four-point, and bending with restrain). It is important to carry out all analyses in terms of stress amplitude, strain amplitude and energy All of these aspects were compared in this study. The test results for oscillatory bending were obtained on a test stand that allows for the performance of a test at a controlled strain amplitude
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