PSI - Issue 7

R. Prochazka et al. / Procedia Structural Integrity 7 (2017) 315–320 R. Prochazka, J. Dzugan, P. Konopik / Structural Integrity Procedia 00 (2017) 000–000

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Fatigue limit evaluation was done by graphical method using two regression lines which is fast and reliable method that requires only fundamental mathematical operations. Moreover, the results are in good agreement with the standard test methods. Presented thermographic method has potential to be used for investigation of residual service life of in-service components, for additive manufacturing components and wherever there is an acute lack of experimental material or a requirement for fast results delivery. Further work will focus on influence of specimen geometries, related to size effect, with the purpose of using this method to test miniature test specimens as is described by Konopik (2012, 2014, 2015), Rund (2015) and Dzugan (2015), which can be used for investigation of very small products such as dental implant materials, Ostrovska (2015). Also, there will be an effort made to avoid the destruction of test specimens to further test degraded material properties using infrared thermographic techniques for non-destructive fatigue limit evaluation. Acknowledgements Paper was created by project No: TH02010544, funded by the TA ČR , and project No.: LO1412 – Development of West-Bohemian Centre of Materials and Metallurgy, financed by the MEYES of the Czech Republic. Luong, M.P., 1992. Infrared thermography of fatigue in metals. SPIE 1992; pp. 222-233. Luong, M.P., K., Dang-Van, 1993. Metal fatigue limit evaluation using infrared thermography. Proceedings of workshop advanced infrared technology and applications, Capri, Sept. 20–21, 1993, pp. 245–253. Luong, M.P., 1995. Infrared thermographic scanning of fatigue in metals. Nuclear Eng Des, pp. 363-376. Luong, M.P., 1998. Fatigue limit evaluation of metals using an infrared thermographic technique. Mech Mater, pp.155–163. La Rosa, G., Risitano, A., 2000. Thermographic methodology for rapid determination of the fatigue limit of materials and components. Int J Fatigue 2000; pp. 65–73 De Finis, R., Palumbo, D., Ancona, F., Galietti, U., 2015. Fatigue limit evaluation of various martensitic stainless steels with new robust thermographic data analysis, Int J Fatigue 74, pp. 88-96 Cura, F., Curti, G., Sesana, R., 2005. A new iteration method for the thermographic determination of fatigue limit in steels, Int J Fatigue 27, pp. 453-459 Shiozawa, D., Inagawa, T., Washio, T., Sakagami, T., 2016. Fatigue limit estimation of stainless steels with new dissipated energy data analysis, Procedia Structural Integrity Vol 2, pp. 2091-2096 Reifsnider, K. L., Williams, R. S., 1974. Determination of fatigue related heat emission in composite materials, Experimental Mechanics, pp. 479-485 Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials, 2007. E466-07 ASM International: The Materials Information Society Konopik, P., Dzugan J., Rund M., 2015. Determination of Fracture Toughness in the Upper Shelf Region Using Small Sample Test Techniques, METAL 2015, pp. 710-715 Konopik, P., Dzugan, J., Rund, M., 2014. Dynamic Tensile and Micro-Tensile Testing Using DIC Method, METAL 2014, pp. 498-503 Konopik, P., Dzugan, J., 2012. Determination of Tensile Properties of Low Carbon Steel and Alloyed Steel 34CrNiMo6 by Small Punch Test and Micro-Tensile Test, 2nd international conference SSTT, pp. 319-328 Runt, M., Prochazka, R., Konopik, P., 2015. Investigation of sample-size influence on tensile test results at different strain rates, ICSI 2015, pp. 410-415 Dzugan, J., Konopik, P., Rund, M., Prochazka, R., 2015. Determination of Local Tensile and Fatigue Properties With the Use of Sub-Sized Specimens, ASME Pressure Vessels and Piping Conference, V01AT01A066 Ostrovska, L., Vistejnova, L., Dzugan, J., et al., 2015. Biological evaluation of ultra-fine titanium with improved mechanical strength for dental implant engineering, Journal of Material Science Vol 51, pp. 3097-3110 References