Determination of fatigue life under low frequency fatigue loading based on temperature evolution

IF 4.8 2区环境科学与生态学 Q1 OCEANOGRAPHY Ocean & Coastal Management Pub Date : 2024-11-22 DOI:10.1016/j.ocecoaman.2024.107491

Peng Zhang, Yu Zhang, Yuhan Guo, Shuang Yao

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Abstract

The wind turbine blades are key components of wind turbines. During the working process, the blades are subjected to fatigue loading, resulting in the failure of wind turbine blades. The surface temperature of blade materials will change when subjected to fatigue loading and the temperature rise rate of blade surface under fatigue loading can be used as an index to predict fatigue life. However, the frequency of fatigue loading on the wind turbine blades is low, the non-adiabatic response under low frequency fatigue loading would lead to temperature dissipation. In this paper, fatigue life prediction under low frequency fatigue loading was studied. Based on the law of energy conservation and the laws of heat conduction, heat convection, heat radiation, the temperature evolution of materials under low frequency fatigue loading was theoretically analyzed. Epoxy resin was selected as testing material and fatigue tests were conducted on epoxy resin specimens. During the fatigue test, the infrared thermal imager was used to monitor the samples surface temperature in real-time. The results show that the predicted life considering temperature dissipation effect is closer to the real life. Meanwhile, the general application of life prediction model is further verified by metal material. This work can be used for predicting the fatigue life of wind turbine blades under low frequency.

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根据温度变化确定低频疲劳载荷下的疲劳寿命

风力涡轮机叶片是风力涡轮机的关键部件。在工作过程中，叶片会承受疲劳载荷，从而导致风力涡轮机叶片失效。叶片材料在承受疲劳载荷时表面温度会发生变化，疲劳载荷下叶片表面的温升速率可作为预测疲劳寿命的指标。然而，风电叶片的疲劳载荷频率较低，低频疲劳载荷下的非绝热响应会导致温度耗散。本文研究了低频疲劳载荷下的疲劳寿命预测。根据能量守恒定律和热传导、热对流、热辐射规律，对低频疲劳加载下材料的温度演变进行了理论分析。试验材料选用环氧树脂，并对环氧树脂试样进行了疲劳试验。在疲劳试验过程中，使用红外热成像仪对试样表面温度进行了实时监测。结果表明，考虑温度耗散效应的预测寿命更接近实际寿命。同时，通过金属材料进一步验证了寿命预测模型的普遍应用。这项工作可用于预测低频下风力涡轮机叶片的疲劳寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ocean & Coastal Management 环境科学-海洋学

CiteScore

8.50

自引率

15.20%

发文量

321

审稿时长

60 days

期刊介绍： Ocean & Coastal Management is the leading international journal dedicated to the study of all aspects of ocean and coastal management from the global to local levels. We publish rigorously peer-reviewed manuscripts from all disciplines, and inter-/trans-disciplinary and co-designed research, but all submissions must make clear the relevance to management and/or governance issues relevant to the sustainable development and conservation of oceans and coasts. Comparative studies (from sub-national to trans-national cases, and other management / policy arenas) are encouraged, as are studies that critically assess current management practices and governance approaches. Submissions involving robust analysis, development of theory, and improvement of management practice are especially welcome.