PSI - Issue 41

Wei Song et al. / Procedia Structural Integrity 41 (2022) 486–491 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 5 shows the fatigue test results based on the static and dynamic simulating methods considering the extracted direction of specimens, which is presented in previous research paper. It demonstrates that samples perpendicular to the rolling direction has lower fatigue life and more significant dispersion than the samples parallel to the rolling direction in Fig. 5(a). Comparing with Fig. 5(a) and (b), it is found that the S-N data of the bending impact vibration ultrasonic fatigue tests by the static simulated methods of the cantilever beam can better reflect the actual results. Since the characterizations of fatigue indicator by static calculating method could not consider the effect of ultrasonic loading conditions for the cantilever beam. On the other hand, the effect of rolling direction on the fatigue life of specimens made is relatively slight, which means that the fatigue strength of specimen extracted from different directions has no obvious difference.

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(b)

B Specimens A Specimens

B Specimens A Specimens

Fig. 5 (a) S-N tests data according to static simulating method; (b) S-N tests data according to dynamic simulating method. Fig. 7 (a) - tests data according to static simulating method; (b) S-N tests data according to dynamic simulating method. 4. Conclusions (1) The fracture locations of the samples with different extracted directions are the same. The specimen extracted direction showed a slight difference for the material fatigue strength. (2) The S-N results by the static calculating method show more dispersion for the test data of fatigue life than those calculated by the dynamic method. With the consideration of inner force for the calculation of fatigue characteristics, the fatigue strength is obtained accurately by comparison with material yield strength. Acknowledgements The authors gratefully acknowledge the support of State Key Laboratory of Air-conditioning Equipment and System Energy Conservation of China (ACSKL2019KT03), the Guangdong Basic and Applied Basic Research Foundation (2019A1515010787), the National Natural Science Foundation of China (Grant no. 52105403), and the Natural Science Foundation of Jiangsu Province (grant no. BK20200174). References [1] Jang Y.N., Lee Y.L., A study on eccentric behavior of discharge valve in refrigerant compressor using laser sensors, Journal of Mechanical Science and Technology 34(3) (2020) 1149-1156. [2] Sim H.Y., Ramli R., Saifizul A., Assessment of characteristics of acoustic emission parameters for valve damage detection under varying compressor speeds, Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234(17) (2020) 3521-3540. [3] Woo S.-w., Pecht M., O'Neal D.L., Reliability design and case study of the domestic compressor subjected to repetitive internal stresses, Reliability Engineering & System Safety 193 (2020).