CLADDING TECHNOLOGY SHANXI CO., LTDEffect of Fiber Tension on Winding Trajectory in Composite Pipe Manufacturing
Literature Overview
This study investigates how fiber tension influences the winding trajectory during the filament winding process of composite pipes. The paper examines the relationship between applied fiber tension, fiber path deviation, and the resulting geometric accuracy of the wound pipe. As an engineer specializing in bimetal and cladding technologies, I find this work relevant because composite-lined or composite-reinforced pressure vessels are increasingly used in high-pressure hydrogen and natural gas applications, where the integrity of the composite layer directly affects vessel performance and safety.
Core Technical Findings
The research demonstrates that fiber tension is one of the dominant process parameters affecting winding trajectory accuracy. When tension is too low, the fiber sags between guide rollers, causing trajectory deviation that can exceed 2 mm on large-diameter pipes. When tension is too high, the fiber may kink or break, and the mandrel may deform under excessive radial pressure. The study identifies an optimal tension window that varies with fiber type, mandrel diameter, and winding angle.
| Parameter | Low Tension Effect | Optimal Range | High Tension Effect |
|---|---|---|---|
| Tension (N) | Trajectory sag, poor compaction | 15–60 N (typical for carbon fiber) | Kinking, mandrel deformation |
| Trajectory deviation | >2 mm on 300 mm dia. | <0.5 mm | Fiber breakage |
| Compaction quality | Poor interlaminar bonding | Uniform consolidation | Excessive radial pressure |
| Residual stress | Low | Moderate | High residual stress |
Interpretation of Trajectory Deviation Mechanisms
The trajectory deviation mechanism is explained through the interaction between fiber tension, gravity, and the guide roller geometry. The fiber behaves as a flexible cable under tension, and its equilibrium path between contact points is determined by the balance of tension forces and external loads. The study introduces a modified trajectory prediction model that incorporates fiber stiffness and guide roller compliance, improving prediction accuracy compared to traditional string-based models.
Engineering Practice Implications
From a pressure vessel fabrication standpoint, the winding trajectory directly affects the fiber volume fraction distribution and the resulting mechanical properties of the composite layer. In composite-reinforced pressure vessels governed by standards such as ISO 15549 or GB/T 34542, uniform fiber distribution is critical for achieving design pressure ratings. The study's findings suggest that tension control systems with real-time feedback are essential for maintaining trajectory accuracy during production winding.
Key Questions and Reflections
I find it particularly interesting that the optimal tension window narrows significantly for high-modulus fibers such as carbon fiber compared to glass fiber. This implies that process control requirements are more stringent for advanced composite applications. For engineers working on bimetal pressure vessels with composite liners, the lesson is clear: fiber tension must be treated as a critical process parameter subject to strict quality control, similar to welding parameters in cladding operations. The study also raises questions about how tension variations during winding affect long-term fatigue behavior, which connects to Topic 3 on biaxial fatigue life prediction.
Study Insights and Implications
The fundamental insight from this literature is that fiber winding is not merely a geometric process but a coupled mechanical process where tension, trajectory, and material behavior interact in complex ways. For engineers transitioning from metal cladding to composite reinforcement technologies, understanding these coupling effects is essential for designing reliable composite-lined pressure vessels. The study provides a solid theoretical foundation for developing process control strategies that ensure consistent quality in high-volume composite pipe production.