Fatigue Life of Flywheel Energy Storage Rotors Composed of 30Cr2Ni4MoV Steel

Dongxu Hu, Xingjian Dai, Bo Xie, Wen Li, Hongyan Yu and Haisheng Chen ()
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Dongxu Hu: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Xingjian Dai: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Bo Xie: CNNP Rich Energy Inner Mongolia Corporation Limited, Hohhot 010010, China
Wen Li: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
Hongyan Yu: CNNP Rich Energy Inner Mongolia Corporation Limited, Hohhot 010010, China
Haisheng Chen: Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2024, vol. 17, issue 15, 1-18

Abstract: In supporting the stable operation of high-penetration renewable energy grids, flywheel energy storage systems undergo frequent charge–discharge cycles, resulting in significant stress fluctuations in the rotor core. This paper investigates the fatigue life of flywheel energy storage rotors fabricated from 30Cr2Ni4MoV alloy steel, attempting to elucidate the material’s mechanical properties, crack propagation behavior, and impact of internal defects on fatigue life. Tensile tests reveal that the material exhibited high yield (992 MPa) and tensile strengths (1130 MPa). The Paris formula is used to model crack growth rates, ending in good agreement with the experimental data. Fatigue tests at various stress conditions highlight the material’s significant variability in fatigue life and emphasize the need for reliable design approaches. This paper also demonstrates that internal defect size and location critically affect fatigue life, calling for improvements in forging inspection standards. Overall, the present study provides a comprehensive analysis of 30Cr2Ni4MoV steel’s suitability for flywheel rotors, balancing safety, and operational efficiency.

Keywords: fatigue life; flywheel energy storage; 30Cr2Ni4MoV alloy steel; crack propagation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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