为获取海缆敷设过程中拉力作用下各层的机械特性, 利用有限元方法建立了海缆拉伸模型。合并了机械特性相近的绝缘内外层屏蔽和阻水带, 忽略了厚度和强度小的外被层, 得到单芯光纤复合海底电缆的几何模型; 利用等结构钢体保证了拉伸时海缆层间的位移同步; 模拟实际敷设工程, 对海缆施加分段力载荷; 最后求解得到了海缆各层的应力、应变和塑性应变等力学数据。结果表明, 海缆敷设过程中各层结构的应力和应变值随受力的增加而增大, 铜导体先达到屈服状态; 求解数据为海缆敷设工作提供了参考。

In order to obtain the mechanical properties of pulling force on each layer, this paper establishes cable tension model by finite element method. The geometric model of single core fiber composite submarine cable is established by combining the outer and inner layer shielding and water blocking tape with similar mechanical properties. The model also neglects the outer layer with small thickness and strength .The same structural rigid body ensures the displacement synchronization between the submarine cables .We then simulate the engineering practice of laying and apply the segmented force load to submarine cable. Finally, the mechanical data of stress, strain and plastic strain of submarine cable are obtained. The results show that the stress and strain of each layer structure increase with the increase of stress, and the copper conductor reaches the yield state first. The data provides a reference for the submarine cable laying work.