Investigations on the Stick-Slip Behavior and Dynamic Interface Friction Mechanisms of Fiber Winding
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摘要: 通过缠绕方式可以增加绳索界面的接触摩擦系数，进而提升其应用的安全性和稳定性。然而，当前关于纤维缠绕的黏滑特性及动摩擦力学行为研究尚存在不足，特别是其与速度相关的黏-滑转换机制仍很欠缺。为此，设计了纤维缠绕的界面黏滑实验，研究了具有高弹性模量的碳纤维以及具有低弹性模量的聚合物纤维在不同加载条件下的界面动摩擦力学性能，探讨了不同加载速度以及界面润滑条件对2种纤维滑移的影响规律。结果表明，界面间的滑动状态主要由材料的弹性模量以及界面间滑移速度共同决定，高弹性模量材料相较于低弹性模量材料更容易脱离黏滑状态进入纯滑动状态。润滑状态下界面摩擦系数的速度敏感性更高。理论结果表明，初始阶段纤维缠绕的界面摩擦系数分布并不均匀，与缠绕角度成反比关系，且弹性模量较高的纤维界面滑移状态的同步性更强。研究结果可为纤维缠绕的界面摩擦与安全使用提供理论和技术支撑。Abstract: Fiber winding can enhance the friction coefficient at the interface of ropes, thereby improving the security and stability of the entire mechanical system. Nevertheless, specific mechanisms underlying this phenomenon remain unclear, particularly concerning the velocity-dependent stick-slip model. An experimental system focused on the stick-slip behavior from fiber winding was designed to unveil principles governing two types of fiber sliding with different fiber types, contact conditions and loading velocities. The results indicate that the fiber elastic modulus and sliding velocity jointly determine the sliding state of the interface. Specifically, brittle fibers with a high elastic modulus exhibit an easier transition from a stick-slip state to a steady-slip state. The variation in the friction coefficient at different sliding velocities is more pronounced under lubricated conditions. Theoretical results indicate that the friction coefficient appears non-uniform across the interface, and is inversely proportional to the angle of entanglement. For high-modulus fibers, the sliding state exhibits stronger synchronization throughout the entire interface. This study provides theoretical and technical support for manipulating interface friction and improving the safe use of fiber winding.
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Key words:
- interface /
- stick-slip /
- dynamic friction /
- fiber winding
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图 3 碳纤维在不同界面润滑条件下的摩擦系数随速度的变化
Figure 3. Correlation between friction coefficient of carbon fibers and velocity under different lubrication conditions
图 4 不同滑移速度下碳纤维和聚合物纤维的摩擦系数的变化（干接触）
Figure 4. Variations of friction coefficients of carbon fibers and polymer fibers under different slip velocities (dry contact)
图 5 不同滑移速度区间内聚合物纤维的滑动状态
Figure 5. Sliding states of polymer fibers under various slip velocities
图 6 弹性模量与滑移速度对界面滑移状态的影响
Figure 6. Effects of elastic modulus and slip velocity on the interface sliding states
图 8 不同滑移速度下纤维界面不同位置的滑移状态
Figure 8. Sliding states of fiber interfaces at different positions under multiple sliding velocities
表 1 聚合物纤维和碳纤维的材料参数
Table 1. Material parameters of polymer fibers and carbon fibers
Material ρ/(kg·m−3) E/MPa D/mm R/mm α/s−1 β/(m·kg−1) τ/Pa Polymer fibers 500 2 1 5 1.2×104 2 6.6×103 Carbon fibers 1800 2.3×105 1 5 2.2×106 0.56 1.6×104 
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