FATIGUE DAMAGE ASSESSMENT MODEL FOR WIND TURBINE SUPPORT STRUCTURES CONSIDERING INFLUENCE OF LOW-STRESS CYCLES

Dai Kaoshan; Du Hang; Luo Yuxiao; Xiong Chuannan; Li Yuan; Sun Zhongze

doi:10.19912/j.0254-0096.tynxb.2024-0109

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (5) : 522-530. DOI: 10.19912/j.0254-0096.tynxb.2024-0109

FATIGUE DAMAGE ASSESSMENT MODEL FOR WIND TURBINE SUPPORT STRUCTURES CONSIDERING INFLUENCE OF LOW-STRESS CYCLES

Dai Kaoshan¹, Du Hang¹, Luo Yuxiao¹, Xiong Chuannan¹, Li Yuan², Sun Zhongze²

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Abstract

To more accurately predict fatigue life in wind turbine support structures subjected to amplitude loads featuring numerous low-stress cycles （below the fatigue limit）, a new fatigue damage model considering low stress damage saturation and strengthening effects is proposed in this paper. The model is based on the nonlinear continuum damage mechanics （NLCD） model proposed by Chaboche, and incorporates the mechanism assumptions of fatigue crack propagation under high and low stress alternating cycles proposed by Tokaji. The model introduces the saturation cycle number and the strengthening coefficient into the mathematical model to respectively limit the infinite accumulation of fatigue damage under low-stress cycles and further consider the strengthening effect caused by a large number of low-stress cycles. Furthermore, this paper derives the calculation formulas for the saturation cycle number and the strengthening coefficient through mathematical deduction, and clarifies their physical meanings and experimental testing methods. Based on this, this paper analyzes and fits the collected high and low stress amplitude fatigue test data, and compares the proposed model with the widely used Miner criterion in engineering and the original NLCD model. The results show that when the proportion of low-stress cycles is high, the Miner criterion cannot consider the damage contribution of low-stress cycles and leads to a high prediction result, and the NLCD model considers the infinite accumulation of damage caused by each low-stress cycle, resulting in a conservative prediction result. In contrast, the proposed model has better accuracy and can more accuately predict the trend of fatigue life with parameters such as high stress amplitude, low stress amplitude, and high-low stress cycle ratio, preliminarily verifying the effectiveness and correctness of the proposed model.

Key words

wind turbines / fatigue damage / strengthening effect （metal） / damage saturation / continuum damage mechanics

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Dai Kaoshan, Du Hang, Luo Yuxiao, Xiong Chuannan, Li Yuan, Sun Zhongze. FATIGUE DAMAGE ASSESSMENT MODEL FOR WIND TURBINE SUPPORT STRUCTURES CONSIDERING INFLUENCE OF LOW-STRESS CYCLES[J]. Acta Energiae Solaris Sinica. 2025, 46(5): 522-530 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0109

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