Abstract
Simple and fast procedures to measure the fatigue limit using infrared thermography were proposed in the literature in the last two decades ago. In general, they consider fatigue damage as an energy dissipation process that is accompanied by some temperature variation ΔT. Those procedures significantly reduce fatigue testing costs by decreasing the quantity of required specimens and by shortening the testing time. The aim of the present work is to evaluate the fatigue limit, the stress amplitude vs. number of cycles fatigue (S-N) curve, and the influence of mean stress on the fatigue strength. Pipeline steel API 5L Gr. B, very common in the pipeline industry, was the test material. Uniaxial tensile specimens were tested under quasi-static monotonic load or under cyclic loads for different minimum to maximum load ratios. During each test, the surface temperature of the specimens was recorded in real time by a microbolometer thermocamera.
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© 2019 The Society for Experimental Mechanics, Inc.
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Paiva, V.E.L., Vieira, R.D., Freire, J.L.F. (2019). Fatigue Properties Assessment of API 5L Gr. B Pipeline Steel Using Infrared Thermography. In: Baldi, A., Quinn, S., Balandraud, X., Dulieu-Barton, J., Bossuyt, S. (eds) Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-95074-7_4
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DOI: https://doi.org/10.1007/978-3-319-95074-7_4
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