复合绝缘子用环氧玻璃纤维芯棒的弯曲负荷性能初探  

Approach to Mechanical Performance of Bending Stressed Composite Insulator with Epoxy FRP Core

作　　者：苏玫[1] 姚君瑞[1] 魏劲容[1] 陈子岩[1] 

机构地区：[1]西安电瓷研究所,陕西西安710077

出　　处：《电瓷避雷器》2006年第3期14-17,共4页Insulators and Surge Arresters

摘　　要：为进一步明确线路柱式复合绝缘子设计原则,验证现有国产环氧玻璃纤维芯棒“损伤极限”,用WDW电子万能材料试验机和按近似水平安装的线路柱式复合绝缘子实际运行工况分别对φ60mm、φ70mm环氧玻璃纤维芯棒进行了弯曲负荷性能测定和分析,认为,φ60mm、φ70mm环氧玻璃纤维芯棒自由端偏移量突变点分别出现在7kN和9kN,其预设损伤限分别为300.7 MPa和234.4MPa。提出用环氧玻璃纤维芯棒作承力件,其机械破坏特性不宜按瓷绝缘子的额定机械破坏负荷来表征,应按照最大设计弯曲负荷表征。芯棒内部出现损伤,在短期内不影响绝缘子的机械强度,但在各种复杂机电应力的作用下,可能会影响其长期运行性能。For further defining the designing principle of composite line post insulator and verifying the ＂damage limit＂ of domestic FRP rod, evaluation and test on bending strength of FRP rods of diameter 60 mm and 70 mm was performed respectively on electronic universal testing machine of WDW type under test conditions simulating service ones of nearly horisontal mounted composite line post insulator. It is considercd that yield point of displacement of free end of FRP of φ60 mm, φ70 mm pears at 7 kN and 9 kN while expcctive damage limit being 300.7 MPa and 234.4 MPa respectively. It is pointed out that the mechanical failing parameter of composite line post insulator with mechanical load bearer made of FRP elastomer material shall not be characterized with mechanical failing load as that for porcelain insulator but with maximum design bending load. Fractures inside the rod might not affect on the mechanical strength of insulator for time being, but its long term mechanical strength may be affected under complex electro-mechanical stresses.

关 键 词：环氧玻璃纤维芯棒 最大设计弯曲负荷 弯曲应力 损伤极限 

分 类 号：TM216[一般工业技术—材料科学与工程]