扁钢丝铠装光纤复合海缆拉伸试验与仿真分析

Tension Test and Simulation Analysis on Flat-steel-wire-armoured Optical Fiber Composite Submarine Cable

随着海洋电力传输的快速发展,扁钢丝铠装型海缆将具有潜在的应用前景。利用研制的扁钢丝铠装光纤复合海缆样品开展拉伸试验及有限元仿真研究,分析了海缆敷设时的受力情况。结果表明:1)海缆伸长率随敷设拉力增加而增大,拉伸端铠装钢丝会产生沿自身方向的旋转和应力释放,仿真后海缆伸长率、拉伸刚度等结果与试验基本一致,结果具有可参考性;2)相比于其他结构,内垫层和外被层应变变形较大,最大应变值比内部线芯大1~2个数量级,可对内部线芯起到良好的缓冲保护作用;3)结合实际试验和仿真结果,光单元钢管最大应变为海缆整体最大应变值的8.5%,处于加载区域,中间段平均应变量级与内部线芯一致。实际拉伸测试光单元附加衰减<0.05d B,符合标准要求,结果表明扁钢丝铠装型海缆敷设时最大拖拽力对光单元的性能无影响;4)海缆拉伸过程中,端部会产生较大的变形波动和应力集中效应,实际施工敷设时需加以防护。海缆内部各层应力、应变变化趋势与圆钢丝铠装型一致,表明2种铠装形式海缆抗拉性能基本一致。

With rapid development of ocean power transmission,the flat-steel-wire-armored submarine cable will have potentials in application prospect.Consequently,we performed tension tests and finite element simulation to analyze the stress state of flat-steel-wire-armoured fiber-optic composite submarine cable.The research results show that:1)the elongation will increase with laying tension,and rotation and stress release will occur in armored steel wires at stretching end along its own direction.Simulation results of cable elongation and tension stiffness are basically consistent with test results.Therefore,results are reliable.2)Compared with other structures,inner cushion and outer cushion layers have larger strain deformation,and the maximum strain is one to two orders of magnitude larger than that of inner core.So they can play a good buffer protection role.3)Combined with tests and simulation results,the maximum strain of optical unit steel tube is 8.5%of the total cable strain at the stretching end.And the average strain level is consistent with inner core.In addition,the additional attenuation of optical units in tensile tests is less than 0.05 dB,which meets standard requirements.These results show that the maximum dragging force has no effect on optical unit when flat-steel-wire-armored submarine cable is being laid.4)During stretching process of submarine cable,large deformation fluctuation and stress concentration effect will occur at the ends,which should be protected effectively.And stress and strain trends are consistent with those of circular wire,showing that two types of armoring cables will have similar tensile properties.