支柱瓷绝缘子表面裂纹应力强度因子的有限元分析
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摘要
通过ANSYS实体建模方法创建了含半椭圆表面裂纹的支柱瓷绝缘子有限元模型,裂纹前缘采用三维20节点等参退化奇异单元模拟尖端的应力应变奇异性,利用1/4节点法计算了弯曲载荷作用下瓷绝缘子裂纹前沿的应力场强度因子,得出KI随裂纹尺寸、位置及载荷水平改变时的变化规律.计算结果表明:相同条件下,支柱下法兰口与底部第一伞裙之间的表面裂纹最深点具有最大的应力强度因子,且KI值随裂纹形状比的增大而减小,随裂纹深度及载荷的增大而增大.
A finite element model of rod porcelain insulator containing semi-elliptical surface crack was established in ANSYS solid modeling method.Three dimensional 20 node isoparametric degenerative singular elements were used to simulate the stress singularity of the crack tip,and the stress intensity factor(SIF)of crack front on porcelain insulator under bending was calculated in 1/4-node method.The rule of crack size,location and various load versus KIwas obtained.The results have shown that,under the same condition,the maximum of crack front SIFs appears at the deepest point between the lower flange port and the first umbrella skirt,and the value of KIdecreases with the increase of crack shape ratio,while increases with the increase of crack depth and load.
A finite element model of rod porcelain insulator containing semi-elliptical surface crack was established in ANSYS solid modeling method.Three dimensional 20 node isoparametric degenerative singular elements were used to simulate the stress singularity of the crack tip,and the stress intensity factor(SIF)of crack front on porcelain insulator under bending was calculated in 1/4-node method.The rule of crack size,location and various load versus KIwas obtained.The results have shown that,under the same condition,the maximum of crack front SIFs appears at the deepest point between the lower flange port and the first umbrella skirt,and the value of KIdecreases with the increase of crack shape ratio,while increases with the increase of crack depth and load.
引文
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[14]印华,王谦,王勇,等.支柱瓷绝缘子断裂原因分析及检测方法[J].电力安全技术,2007,9(12):47-48.YIN Hua,WANG Qian,WANG Yong,et al.The failure analysis and detection methods for porcelain strut insulators[J].Electric Safety Technology,2007,9(12):47-48.(In Chinese)
[2]马艳.结构表面裂纹应力强度因子计算方法研究[D].大连:大连理工大学,2007.MA Yan.Study on method for calculating SIF of structural surface crack[D].Dalian:Dalian University of Technology,2007.(In Chinese)
[3]王永伟,林哲.表面裂纹的三维模拟及应力强度因子计算[J].中国海洋平台,2006,21(3):23-26.WANG Yong-wei,LIN Zhe.3-D Simulation and stress intensity factors calculation of surface crack[J].China Offshore Platform,2006,21(3):23-26.(In Chinese)
[4]瞿伟廉,鲁丽君,李明.带三维穿透裂纹结构的有限元实体建模方法[J].武汉理工大学学报,2008,30(1):87-90.QU Wei-lian,LU Li-jun,LI Ming.Solid modeling method for structure with 3-D straight through crack[J].Journal of Wuhan University of Technology,2008,30(1):87-90.(In Chinese)
[5]LIN X B,SMITH R A.Stress intensity factors for corner cracks emanating from fastener holes under tension[J].Engineering Fracture Mechanics,1999,62(6):535-553.
[6]IRWIN G R.Crack-extension force for a part-through crack in aplate[J].Journal of Applied Mechanics,1962,29:651-654.
[7]KASSIR M K,SIH G C.Three-dimensional stress distribution around an elliptical crack under arbitrary loadings(Threedimensional stresses near border of discontinuity plane under arbitrary loading,obtaining solution for uniform shear applied to surface of crack)[J].ASME,Transactions,Series E-Journal of Applied Mechanics,1966,33:601-611.
[8]SMITH F W,KOBAYASHI A S,EMERY A F.Stress intensity factors for penny-shaped cracks:part 1—infinite solid[J].Journal of Applied Mechanics,1967,34:947-952.
[9]陈晓明,矫桂琼,崔振源.复合型断裂准则在半椭圆表面裂纹问题中的应用[J].西北工业大学学报,1986,4(4):385-393.CHEN Xiao-ming,XU Gui-qiong,CUI Zhen-yuan,Application of combined-mode fracture criteria to semi-elliptical surface crack problems[J].Journal of Northwestern Polytechnical University,1986,4(4):385-393.(In Chinese)
[10]FEHL B D,TRUMAN K Z.An evaluation of fracture mechanics quarter-point displacement techniques used for computing stress intensity factors[J].Engineering Structures,1999,21(5):406-415.
[11]张朝晖.ANSYS12.0结构分析工程应用实例解析[M].3版.北京:机械工业出版社,2010.ZHANG Chao-hui.ANSYS12.0structural analysis instances for engineering application[M].The 3rd edition.Beijing:China Machine Press,2010.(In Chinese)
[12]王云昌.支柱瓷绝缘子的超声波检测[J].江西电力,2007,31(3):1-2.WANG Yun-chang.The ultrasonic inspection for porcelain strut insulators[J].Jiangxi Electric Power,2007,31(3):1-2.(In Chinese)
[13]王维东,刘勇.支柱绝缘子及瓷套超声波探伤工艺方法研究[J].无损检测,2006,28(9):460-462.WANG Wei-dong,LIU Yong.Research on ultrasonic inspection technique of pillar insulators and porcelain cover[J].Nondestructive Testing,2006,28(9):460-462.(In Chinese)
[14]印华,王谦,王勇,等.支柱瓷绝缘子断裂原因分析及检测方法[J].电力安全技术,2007,9(12):47-48.YIN Hua,WANG Qian,WANG Yong,et al.The failure analysis and detection methods for porcelain strut insulators[J].Electric Safety Technology,2007,9(12):47-48.(In Chinese)
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