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对断裂失效的钢芯铝绞线采用扫描电镜、金相检验、强度和硬度测试等方法进行了分析。结果表明:该断裂类型为脆性断裂,钢芯铝绞线的显微组织和非金属夹杂物均正常。断裂失效的主要原因是接续管上的较深钳口压痕会使钢芯变形处与未变形处产生应力集中,且接续管与钢芯形变接触产生很大的摩擦力。在此条件下,钳口压痕处对应的1#样率先破坏失效,从而导致其他钢丝后续断裂。此外,材料内部有微孔,其尺寸大小约为4μm。微孔的存在导致材料性能降低。
Failure of the ACSR by scanning electron microscopy, metallographic examination, strength and hardness testing methods were analyzed. The results show that the fracture type is brittle fracture, the microstructure and non-metallic inclusions of ACSR are normal. Fracture failure is the main reason for the deeper pipe joint indentation will lead to the deformation of the steel core and the deformation of the stress concentration, and the continuous tube and the steel core deformation contact has a great friction. Under this condition, the corresponding # 1 specimen at the indentation of the jaws is destroyed firstly, which leads to the subsequent breakage of other steel wires. In addition, the material has micropores inside and has a size of about 4 μm. The presence of micropores leads to reduced material properties.