针对地震载荷下盆式绝缘子环氧树脂裂纹加速扩展问题，基于最大周向应力准则，建立环氧树脂裂纹缺陷加速演变模型，模拟不同地震等级下环氧树脂材料的裂纹扩展过程，掌握不同地震加速度、应力比、裂纹初始角度等多种影响因素下的裂纹扩展行为特征参数，预测环氧树脂材料裂纹扩展路径与疲劳寿命。结果表明：环氧树脂材料疲劳寿命随着地震加速度的增加呈线性减小趋势；外施载荷应力比每增加0.2，环氧树脂因裂纹扩展造成的疲劳寿命值增加约200 s；当环氧树脂材料裂纹起始角度由90°增加至135°时，其疲劳寿命将显著增加，由746 s增加至1 479 s。研究结果对开展地震载荷作用下的盆式绝缘子裂纹扩展预测具有重要价值。

Aiming at the problem of accelerated crack propagation in epoxy resin of basin insulators under seismic loading, a model for the accelerated evolution of epoxy resin crack defects was established based on the maximum circumferential stress criterion. The crack propagation process of epoxy resin material under different seismic magnitudes was simulated to grasp the characteristic parameters of crack propagation behavior under various influencing factors such as different seismic accelerations, stress ratios, and initial crack angles. The crack propagation path and fatigue life of epoxy resin material were predicted. The results show that the fatigue life of epoxy resin material decreases linearly with the increase of seismic acceleration. For every 0.2 increase in the applied load stress ratio, the fatigue life of epoxy resin due to crack propagation increases by approximately 200 s. When the initial crack angle of epoxy resin material increases from 90° to 135°, its fatigue life will increase significantly, from 746 s to 1 479 s. The research results are of great value for predicting crack propagation in basin insulators under seismic loading.