Abstract
Fiber-reinforced flexible pipes are widely used to transport the fluid at locations requiring flexible connection in pipeline systems. It is important to predict the burst pressure to guarantee the reliability of the flexible pipes. Based on the composite shell theory and the transfer-matrix method, the burst pressure of flexible pipes with arbitrary generatrix under internal pressure is investigated. Firstly, a novel method is proposed to simplify the theoretical derivation of the transfer matrix by solving symbolic linear equations. The method is accurate and much faster than the manual derivation of the transfer matrix. The anisotropy dependency on the circumferential radius of the pipe is considered in the theoretical approach, along with the nonlinear stretch of the unidirectional fabric in the reinforced layer. Secondly, the burst pressure is predicted with the Tsai-Hill failure criterion and verified by burst tests of six different prototypes of the flexible pipe. It is found that the burst pressure is increased significantly with an optimal winding angle of the unidirectional fabric. The optimal result is determined by the geometric parameters of the pipe. The investigation method and results presented in this paper will guide the design and optimization of novel fiber-reinforced flexible pipes.
Highlights
Fiber-reinforced flexible pipes are widely used to transport fluid at locations requiring flexible connection in pipeline systems
The comparison between theoretical and test results of burst pressure is shown in Figure 7 and Table 4
The burst pressure of fiber-reinforced flexible pipes with arbitrary generatrix is investigated based on the composite shell theory and the transfer-matrix method
Summary
Fiber-reinforced flexible pipes are widely used to transport fluid at locations requiring flexible connection in pipeline systems. They protect the pipeline from damage caused by mechanical vibration and shock, proved extremely useful in aerospace engineering and marine engineering. Flexible pipes with arbitrary generatrix, such as spherical type and multiple arch type, have better performance on displacement compensation and vibration suppression.
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