基于材料非线性的两种海缆弯曲限制器的有限元分析与试验验证

海缆在使用过程中,受到洋流冲击及自身重量的影响,容易过度弯曲,从而影响海缆的寿命,造成经济损失。弯曲限制器是防止海缆过度弯曲的重要附件。文中建立海缆弯曲限制器A、B两种不同结构的模型,通过有限元模拟分析,比较在相同弯矩载荷下两种结构的锁紧弯曲半径及应力、应变情况,并通过试验验证两种结构的实际使用情况和模拟分析结果的一致性,为海缆弯曲限制器的优化改进提供了参考。计算结果表明:随着弯矩的增大,两种结构的锁定弯曲半径的变化趋势一致,但相同的弯曲半径下所能承受的载荷和两种结构曲率的平缓度有着较大的差异;在相同的应用环境下,B型结构能够更好地保护海缆,限制海缆的最小弯曲半径。

Finite Element Analysis and Experimental Verification on Two Kinds of Bend Restrictors for Submarine Cables on Material Non-linearity

Submarine cable is influenced by the impact of ocean currents and the weight of itself during operation. Those influences, which mentioned above, will make submarine cable overbend easily, thus reduce service life of submarine cable and make economic losses. Bend restrictor is used to protect submarine cable from overbending. Two typical structures of bend restrictor for type A and B were built, and the finite element analysis method was used to compare the locking bending radius, stress and strain of the two structures under the same bending moment load.The analysis results were compared by experiments for future improvement. The analysis results show that the bending radius under locking condition have the same change trend, while the stress and the rate of change under the same bending radius have a big difference. In the same condition, the structure of type B has a better effect on protecting the submarine cable and limiting the minimum bending radius.