基于红外热像技术的风力机微裂纹叶片研究
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摘要
通过对有边缘微裂纹的兆瓦级风力机叶片试件进行拉伸断裂试验,采用红外热像仪全程监测试件表面温度,研究复合材料叶片微裂纹损伤区内温度场变化,分析试件拉伸断裂过程中的损伤演变情况。结果表明:1)塑性功转变成热的热耗散因子为80%;2)微裂纹裂尖温度变化趋势为先线性下降后升高;3)试验中发现试件温度场断裂前无明显变化;4)试件断裂损伤形式有纤维断裂、分层、界面脱粘。
The microcrack on the edge of MW wind turbine blade specimen was tested by tensile fracture test. The infrared thermography was used to monitor surface temperature of blade specimen,and research the temperature field variation in microcrack area of composite blade,and analyze the specimen damage evolution during tensile fracture of blade specimen. The results show that the heat dissipation factor of plastic energy converted into heat is 80% temperature change of microcrack tip firstly is linear temperature drop,then temperature rise. The test find that the specimen temperature field has no obvious change before fracture. The fracture damage form of the specimen has fiber breakage,delamination and interface debonding.
The microcrack on the edge of MW wind turbine blade specimen was tested by tensile fracture test. The infrared thermography was used to monitor surface temperature of blade specimen,and research the temperature field variation in microcrack area of composite blade,and analyze the specimen damage evolution during tensile fracture of blade specimen. The results show that the heat dissipation factor of plastic energy converted into heat is 80% temperature change of microcrack tip firstly is linear temperature drop,then temperature rise. The test find that the specimen temperature field has no obvious change before fracture. The fracture damage form of the specimen has fiber breakage,delamination and interface debonding.
引文
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[2]朱小军,陈雪峰,翟智,等.复合材料风电叶片细观失效准则及其损伤演化[J].机械工程学报,2014,50(11):17-22.[2]Zhu Xiaojun,Chen Xuefeng,Zhai Zhi,et al.Microscopic failure criterion and damage evolution of composite material wind turbine blade[J].Journal of Mechanical Engineering,2014,50(11):17-22.
[3]李雅峰,徐玉秀.基于模态应变能变化率的大型风力发电机叶片损伤识别与定位[J].太阳能学报,2015,36(9):2251-2256.[3]Li Yafeng,Xu Yuxiu.Damage identification and positioning of wind turbine blade based on element modal strain energy change ratio[J].Acta Energiae Solaris Sinica,2015,36(9):2251-2256.
[4]Tang Jialin,Soua S,Mares C,et al.An experimental study of acoustic emission methodology for in service condition monitoring of wind turbine blades[J].Renewable Energy,2016,99:170-179.
[5]Lee Jae-Kyung,Park Joon-Yang,Oh Ki-Yong.Transformation algorithm of wind turbine blade moment signals for blade condition monitoring[J].Renewable Energy,2015,79(7):209-218.
[6]胡燕平,戴巨川,刘德顺.大型风力机叶片研究现状与发展趋势[J].机械工程学报,2013,49(20):140-151.[6]Hu Yanpin,Dai Juchuan,Liu Deshun.Research status and development trend on large scale wind turbine blades[J].Journal of Mechanical Engineering,2013,49(20):140-151.
[7]肖劲松,严天鹏.风力机叶片的红外热成像无损检测的数值研究[J].北京工业大学学报,2006,32(1):48-52.[7]Xiao Jingsong,Yan Tianpeng.Numerical analysis of NDT of wind turbine blades using infrared imaging[J].Journal of Beijing University of Technology,2006,32(1):48-52.
[8]郭伟,董丽虹,王慧鹏,等.基于红外热像技术的涡轮叶片损伤评价研究进展[J].航空学报,2016,38(2):429-436.[8]Guo Wei,Dong Lihong,Wang Huipeng,et al.Research progress of damage estimation for turbine blades based on infrared thermographic technology[J].Acta Aeronautica Astronautica Sinica,2016,38(2):429-436.
[9]Colombo C,Libonati F,Pezzani F,et al.Fatigue behavior of a GFRP laminate by thermographic measurements[J].Procedia Engineering,2011,10:3518-3527.
[10]Emery T R,Dulieu-Barton J M.Thermoelastic stress analysis of damage mechanisms in composite materials[J].Composite Part A:Applied Science and Manufacturing,2010,41(12):1729-1742.
[11]Barile C,Casavola C,Pappalettera G,et al.Analysis of crack propagation in stainless steel by comparing acoustic emissions and infrared thermography data[J].Engineering Failure Analysis,2016,69:35-42.
[12]Cui Z Q,Yang H W,Wang W X,et al.Research on fatigue crack growth behavior of AZ31B magnesium alloy electron beam welded joints based on temperature distribution around the crack tip[J].Engineering Fracture Mechanics,2015,133:14-23.
[13]Martinez J R S,Balandraud X,Toussaint E,et al.Thermomechanical analysis of the crack tip zone in stretched crystallizable natural rubber by using infrared thermography and digital image correlation[J].Polymer,2014,55(24):6345-6353.
[14]Ranc N,Palin-Luc T,Paris P C.Thermal effect of plastic dissipation at the crack tip on the stress intensity factor under cyclic loading[J].Engineering Fracture Mechanics,2011,78(6):961-972.