After long-term service in deep ocean, pipelines are usually suffered from corrosions, which may greatly influence the Vortex-Induced Vibration (VIV) behavior of pipes. Thus, we investigate the VIV of defective pipelines. The geometric nonlinearity due to large deformation of pipes and nonlinearity in vortex-induced force are simulated. This nonlinear vibration system is simulated with finite element method and solved by direct integration method with incremental algorithm. Two kinds of defects, corrosion pits and volumetric flaws, and their effects of depth and range on VIV responses are investigated. A new finite element is developed to simulate corrosion pits. Defects are found to aggravate VIV displacement response only if environmental flow rate is less than resonance flow rate. As the defect depth grows, the stress responses increase, however, the increase of the defect range reduces the stress response at corroded part. The volumetric flaws affect VIV response stronger than the corrosion pits.

在深海中长期使用后，管道通常会遭受腐蚀，这可能会极大地影响管道的涡激振动（VIV）行为。因此，我们调查了有缺陷的管道的VIV。模拟了由于管道大变形而引起的几何非线性和涡激力的非线性。用有限元方法对该非线性振动系统进行仿真，并采用增量算法直接积分法求解。研究了两种缺陷，腐蚀坑和体积缺陷，及其深度和范围对VIV响应的影响。开发了一种新的有限元来模拟腐蚀点。仅当环境流速小于共振流速时，发现缺陷会加剧VIV位移响应。随着缺陷深度的增加，应力响应增加，但是，缺陷范围的增加会降低腐蚀部位的应力响应。体积缺陷对VIV响应的影响要强于腐蚀坑。