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以LGJ150/25型钢芯铝绞线为试验导线,在自制试验装置上模拟了在干燥和酸性条件下导线的微风振动,采用扫描电子显微镜和能谱仪观察试验导线磨痕微观形貌与成分,建立了相同工况下内外层线股接触区有限元模型,分析有限元模型的计算结果与磨痕形貌。分析结果表明:2种条件下内层铝线股接触区的磨痕形状与应力分布均为椭圆形,其长轴与线轴中心呈一定夹角;铝线股接触区磨损特性与接触应力分布相关,接触区中心区接触应力明显高于其他区域,高应力使表面产生塑性变形与大量磨损微粒;磨损边缘区发生了弹性变形,受中心区特别是过渡区突变应力挤压作用,产生了表层组织的塑性流动和堆积现象;在中心区与边缘区的过渡区域存在应力集中,法向压应力和剪应力发生突变,滋生了疲劳裂纹。
Using LGJ150 / 25 ACSR as the test wire, the breeze vibration of the wire under dry and acidic conditions was simulated on a homemade test device. The microscopic morphology and composition of the wear wire on the test wire were observed by scanning electron microscope and energy dispersive spectrometer. The finite element model of the contact area of the inner and outer strands under the same working condition was established, and the calculation results of the finite element model and the shape of the wear scar were analyzed. The results show that under both conditions, the shape and stress distribution of the wear scar in the contact area of the inner aluminum strands are oval with the long axis at an angle to the center of the bobbin. The wear characteristics of the contact area of the aluminum strands are related to the contact stress distribution , The contact stress in the contact zone center is obviously higher than that in other areas. The high stress causes plastic deformation and a large amount of wear particles on the surface. The worn edge zone is deformed elastically, and by the sudden stress squeezing in the center zone, especially in the transition zone, Plastic flow and accumulation phenomenon; there is stress concentration in the transitional area between the central area and the marginal area, normal compressive stress and shear stress change suddenly, breed fatigue cracks.