针对输电线路压缩型耐张线夹钢芯、钢锚多次发生断裂，为深入研究其失效机理，设计开展NY-400/35型压缩型耐张线夹仅压钢锚的压接和拉伸试验，得到耐张线夹钢锚压接区的极限承载能力，并采用Solidworks建立耐张线夹仅压钢锚侧的仿真模型。通过有限元分析的方法对耐张线夹钢锚钢芯压接区的压接以及拉伸过程进行仿真分析，并与实验结果进行比对得出耐张线夹钢锚传力路径的危险截面和失效机理。结果表明，仅钢锚传力的耐张线夹失效形式为钢芯断裂，握力值仅为导线计算拉断力的50 %，钢锚钢芯压接区上有钢锚出口处钢芯和最后一模压接处以及凹槽过渡区钢锚三处危险截面，当线夹承载超过三处截面的破坏载荷或者钢芯和钢锚之间的最大接触力时会发生相应失效，其中危险截面的破坏载荷与强度极限和截面积呈正相关，与应力集中水平呈反相关。

In order to investigate the failure mechanisms of compression type tension clamp steel core and steel anchor in transmission lines that frequently fracture, the compression and tensile tests of NY-400/35 compression type tension clamp steel anchor are designed to obtain the ultimate bearing capacity of the compression area of the tension clamp steel anchor, and the simulation model of tension clamp steel anchor side is established by using Solidworks. The finite element analysis method is used to simulate the crimping and tensile process of the steel core crimping area of the tension clamp steel anchor, and the dangerous section and failure mechanism of the force transmission path of the tension clamp steel anchor are obtained by comparing with the experimental results. The results show that the failure form of the tensioning clamp of the steel anchor only is the fracture of the steel core, and the grip force value is only 50% of the calculated breaking force of the wire. There are three dangerous cross sections of the steel anchor at the exit of the steel anchor and the last die pressing joint and the steel anchor in the transition zone of the groove. Failure occurs when the clamp carries more than three sections of failure load or the maximum contact force between steel core and steel anchor. The failure load of dangerous section is positively correlated with the strength limit and cross-sectional area, and inversely correlated with the stress concentration level.