Acoustic Emission Monitoring for Wind Turbine Blade Composite Material Under Bending Damage Failure Condition
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摘要: 通过对含纤维断裂缺陷的风电叶片玻璃钢复合材料三点弯曲试验，研究风电叶片复合材料弯曲损伤破坏及其声发射响应特征。试验研究表明，复合材料三点弯曲试件载荷-挠度曲线近似为直线，表面20层纤维断裂缺陷导致复合材料强度急剧下降；含中间20层纤维断裂缺陷试件与无缺陷试件相比，强度和刚度相差不大；纤维断裂缺陷使复合材料的破坏形式发生变化。声发射监测数据显示，风电叶片复合材料弯曲损伤破坏与声发射的幅度、能量、撞击、上升时间、持续时间和计数等参量特征相关。Abstract: The three-point bending tests were conducted for the study of bending damage and acoustic emission response characteristics of wind turbine blade composite material with fiber fracture defect. Experimental results showed that the load-deflection curve of composite specimen was linear approximately, and the strength of composite specimen decreased sharply by the fiber fracture defect in the surface 20 plies. Comparing the strength and stiffness between specimen with fiber fracture defect in the middle 20 plies and specimen free of defects, a few differences were found. For the fiber fracture defect, failure mode of wind turbine blade composite material was changed. It was also found that the acoustic emission characteristics such as amplitude, energy, impact, rise time, duration, count and other parameters in bend tests were useful for monitoring the damage development and failure of the specimen.
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Keywords:
- Wind turbine blade /
- Composite material /
- Bend /
- Acoustic emission testing
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