连续管卷绕破坏分析∗

摘要

连续管在滚筒上反复卷绕和矫直过程中产生的塑性应变，会引起连续管的累积残余变形和低周疲劳，最终导致连续管的形变疲劳或疲劳破坏。对连续管的试验载荷与现场载荷进行分析，并用有限元模拟连续管在卷绕矫直中的变形和疲劳，探寻了目前试验中连续管弯曲椭圆度等参数与现场数据不吻合的原因，分析了连续管卷绕时在不同工况下各参数变化情况和连续管破坏形式。研究结果可为高效使用连续管和设计性能优良的连续管作业机提供理论基础。%The plastic strain of the coiled tubing caused by winding and unwinding could lead to cumulative residual deformation and low cycle fatigue, resulting in coiled tubing deformation fatigue or fatigue dam⁃age�Through analysis on the test loads and onsite loads of coiled tubing, and finite element simulation of coiled tubing deformation and fatigue during winding and unwinding process, the reason of inconsistent of test results and field data of coiled tubing bending ovality has been explored�Then, parameters change and damage forms of coiled tubing have been analyzed during winding process under different conditions�The study results could provide theo⁃retical bases for high efficient use of coiled tubing and the design of coiled tubing unit with superior performance.