微缺陷风力机叶片复合材料的疲劳损伤及疲劳寿命研究

玻璃钢/复合材料 ›› 2019, Vol. 0 ›› Issue (12): 18-23.

微缺陷风力机叶片复合材料的疲劳损伤及疲劳寿命研究

王琳琳, 陈长征^*, 周勃, 康爽

沈阳工业大学机械工程学院,沈阳110870

收稿日期:2018-11-19 出版日期:2019-12-28 发布日期:2019-12-28
通讯作者: 陈长征(1964-),男,博士,教授,主要从事大型风力机叶片的损伤和疲劳寿命方面的研究,wll_2016@126.com。
作者简介:王琳琳(1982-),女,工程师,主要从事大型风力机叶片的损伤和大型设备的故障诊断方面的研究。
基金资助:
国家自然科学基金(51575361,51675350);辽宁省百千万人才工程(2015049)

STUDY ON FATIGUE DAMAGE AND FATIGUE LIFE OF WIND TURBINE BLADES COMPOSITES WITH MICRO-DEFECTIVE

WANG Lin-lin, CHEN Chang-zheng^*, ZHOU Bo, KANG Shuang

School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China

Received:2018-11-19 Online:2019-12-28 Published:2019-12-28

摘要/Abstract

摘要： 对含微缺陷叶片试件进行疲劳试验,利用红外热像技术监测试件表面温度变化,观测红外热像图变化,研究试件受力过程损伤演化及疲劳寿命,研究叶片试件疲劳试验中熵产和累积总熵随疲劳寿命的变化。结果发现,叶片试件表面温度变化有快速升温、平稳上升、急剧上升,分别约占整个疲劳寿命的10%、70%和20%。观察红外热像图有微缺陷位置最先出现明亮热源,温度急剧上升时热源范围随着时间的变化而增大。发现试件累积总熵产随疲劳寿命的变化规律同温度随疲劳寿命的变化相同;试件的累积总熵随疲劳寿命呈现非线性变化。通过试验计算得出叶片试件的疲劳断裂熵值是独立参数的固定值。基于热力学疲劳断裂熵作为失效准则,建立预测叶片复合材料疲劳寿命的新模型。

关键词: 红外热像, 疲劳寿命, 温度, 疲劳损伤

Abstract: The wind turbine blade specimens with micro-defects were carried out tension-tension fatigue testes. The surface temperature change and infrared thermogram change of blade specimens were monitored by infrared thermography under fatigue tests. The fatigue damage evolution process of specimens was found out by infrared thermography pictures. The entropy production and entropy accumulation of specimen were studied in the fatigue tests. The wind turbine blade with micro-defects had three stages of temperature change in the fatigue test i.e., rapid temperature rise, steady temperature rise, and sharp temperature rise. The three stages of temperature change were account for about 10%, 70%, and 20% of the total fatigue life in the fatigue test. It is found that the position of the micro-defect in the test piece first appears as a bright heat source by the infrared thermal images. The heat source range increases with the load time when the temperature rose sharply. The cumulative entropy production of specimens with three stages of change was the same as the temperature change trend. The entropy accumulation showed nonlinear variation with load under fatigue test. The fatigue fracture entropy of blade specimen was an independent parameter which was not affected by any parameters at the fatigue test. A new predicting fatigue life model of blade was established based on the thermodynamic fatigue fracture entropy failure criterion.

Key words: infrared thermography, fatigue life, temperature, fatigue damage

中图分类号:

TB332

王琳琳, 陈长征, 周勃, 康爽. 微缺陷风力机叶片复合材料的疲劳损伤及疲劳寿命研究[J]. 玻璃钢/复合材料, 2019, 0(12): 18-23.

WANG Lin-lin, CHEN Chang-zheng, ZHOU Bo, KANG Shuang. STUDY ON FATIGUE DAMAGE AND FATIGUE LIFE OF WIND TURBINE BLADES COMPOSITES WITH MICRO-DEFECTIVE[J]. Fiber Reinforced Plastics/Composites, 2019, 0(12): 18-23.

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