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

Abstract

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

CLC Number:

TB332

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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