【摘要】 针对海底电缆弯曲限制器的蠕变问题，设计并进行聚氨酯材料的拉伸蠕变试验，得到基于时效硬化模型的聚氨酯蠕变本构模型。基于聚氨酯材料的蠕变特性，采用Abaqus软件建立考虑蠕变的弯曲限制器结构数值分析模型，并以一个典型的弯曲限制器为例进行强度及弯曲保护性能分析。在施加1 a的恒定弯矩作用下，分别获得该弯曲限制器的应变、应力和整体曲率半径随时间的变化情况。结果表明，长时间载荷作用对曲率半径的影响较峰值应变和应力明显，即当需要长时间使用时弯曲保护性能失效比自身强度失效更易发生。更多还原

【Abstract】 To address the issue of creep in the bending restrictors of submarine cable, tensile creep tests are designed and carried out on polyurethane material, and a creep constitutive model for polyurethane based on time-hardening model is obtained. Based on the creep characteristics of the polyurethane material, a numerical analysis method considering creep for the bending restrictor structure is established using Abaqus software. The strength and bending protection performance analysis is carried out on a typical bending restrictor as an example. The changes in strain, stress and overall curvature radius over time of the bending restrictor are obtained under a constant bending moment applied for up to one year. The results show that the long-term load is of a more significant effect on the curvature radius than on the peak strain and stress, that is, the loss of bending protection performance is more likely to occur than the strength failure when used for a long time.更多还原