PSI - Issue 40

A.V. Gonchar et al. / Procedia Structural Integrity 40 (2022) 166–170 A.V. Gonchar et al./ Structural Integrity Procedia 00 (2022) 000 – 000

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The maximum decrease in acoustic birefringence was found to be the same (− 0.0029) for both specimens, taking into account the measurement accuracy. In addition, it should be noted that the specimens were heterogeneous in the initial state. As shown in Figure 3b, in coordinates { N / N f ; Δ B }, experimental data for both specimens can be represented by a single linear relationship:

(2)

348 B   

N N

f

This relationship can be used for prediction of fatigue life from ultrasonic data. It seems that the proposed technique has potential for industrial application. Conclusion The microstructure evolution and change in acoustic birefringence under low-cycle fatigue were experimentally investigated for the base metal and HAZ specimens of hot-rolled low-carbon steel. Persistent slip bands appeared on the damaged surface of the specimens; the process was more intensive in the HAZ. Acoustic birefringence was found to decrease linearly with loading cycles. The results of ultrasonic studies can be used for assessing fatigue damage of hot-rolled low-carbon ASTM 1020 steel. Acknowledgements This work was supported by the Russian Science Foundation, grant number 21-79-10395. References Belyaev, A.K., Polyanskiy, V.A., Semenov, A.S., Tretyakov, D.A., Yakovlev, Y.A., 2017. Investigation of the correlation between acoustic anisotropy, damage and measures of the stress-strain state. Procedia Struct. Integr. 6, 201 – 207. Gonchar, A.V., Kurashkin, K.V., Andreeva, O.V., Anosov, M.S., Klyushnikov, V.A., 2021. Fatigue life prediction of structural steel using acoustic birefringence and characteristics of persistent slip bands. Fatigue Fract. Eng. Mater. Struct. Gupta, S., Ray, A., Keller, E., 2007. Online fatigue damage monitoring by ultrasonic measurements: A symbolic dynamics approach. Int. J. Fatigue 29, 1100 – 1114. He, C., Huang, C., Liu, Y., Wang, Q., 2014. Fatigue damage evaluation of low-alloy steel welded joints in fusion zone and heat affected zone based on frequency response changes in gigacycle fatigue. Int. J. Fatigue 61, 297 – 303. Kurashkin, K. V., Gonchar, A. V., 2018. Variation of acoustic characteristics of an aluminum alloy during plastic deformation at room and subzero temperatures, in: AIP Conference Proceedings. p. 030030. Lan, L., Shao, G., 2020. Morphological evolution of HAZ microstructures in low carbon steel during simulated welding thermal cycle. Micron 131, 102828. Makowska, K., Piotrowski, L., Kowalewski, Z.L., 2017. Prediction of the Mechanical Properties of P91 Steel by Means of Magneto-acoustic Emission and Acoustic Birefringence. J. Nondestruct. Eval. 36, 43. Mishakin, V.V., Gonchar, A.V., Kurashkin, K.V., Klyushnikov, V.A., Kachanov, M., 2021. On low-cycle fatigue of austenitic steel. Part I: Changes of Poisson’s ratio and elastic anisotropy. Int. J. Eng. Sci. 168, 103567. Veerababu, J., Goyal, S., Nagesha, A., 2021. Studies on creep-fatigue interaction behavior of Grade 92 steel and its weld joints. Int. J. Fatigue 149, 106307.