光纤复合海缆弯曲与光单元应变关系的有限元分析

摘要

The finite element bending model of fiber composite submarine cable is established in this paper.By meshing and ap-plying load,the paper obtains the stress and strain data of copper and lead alloy.The whole bending process of submarine cable bending is analyzed in detail.In addition,the paper uses the least square method to establish the relationship between the opti-cal unit strain and the copper and lead alloy stress.The result shows that the same cross-sectional structure at the same outer stress have the same equal and opposite directions under the same bending angular velocity and different bending radius condi-tions.The change of structure stress has similar trends when it bending with different radius.The investigation provides a the-oretical reference for use of distributed optical fiber sensing technology in detection of submarine cable bending state.%采用有限元法建立了光纤复合海缆的弯曲模型，进行了网格划分和载荷施加，得到了铜导体、铅合金和光单元的应力、应变数据，详细分析了海缆的整个弯曲过程。利用最小二乘法建立了弯曲过程中铜导体、铅合金应力与光单元应变的关系。结果表明，相同弯曲角速度、不同弯曲半径下，同一结构内外侧应力的大小相等，方向相反；海缆以不同弯曲半径发生弯曲时，各结构应力的整体变化趋势一致。研究成果为利用光纤传感技术监测海缆弯曲状态提供了理论参考。