基于径向滑移传播理论的新型防松结构设计

Design of Novel Anti-loosening Structures Based on The Radial Slippage Propagation Theory

螺栓接头在振动环境下容易发生自松动,并可能引起螺栓疲劳断裂,造成严重后果。明确螺纹的自松机理,在此基础上开发新型防松螺纹结构是十分必要的。径向滑移传播理论为自松动过程提供了新的见解,该理论指出沿螺纹表面径向方向的滑移引起了更多的滑移区域(滑移传播),并且随着振动循环次数的增加,螺纹和轴承表面接触状态的动态演变和传播导致了自松动的发生。因此,基于径向滑移传播理论提出了一种新型的防松结构——阶梯螺纹啮合螺栓接头,该接头可以防止外螺纹和内螺纹在径向上发生相对运动,从而阻止滑移的传播。实验验证了改新型防松结构优异的防松、抗疲劳性能,且安装拆卸方便。

Bolted joints are prone to self-loosening in the vibration environment and may cause bolt fatigue fracture with catastrophic consequences.It is essential to clarify the self-loosening mechanism and on this basis to develop a novel anti-loosening thread structure.The theory of radial slippage propagation provides new insights into the process of self-loosening.This theory points out that the slippage along the radial direction of the thread surface induces more slippage areas(slippage propagation),and self-loosening occurs due to the dynamic evolution and propagation of contact states on the thread and bearing surfaces with an increase in the number of vibration cycles.Therefore,a novel bolted joint with step thread engagement was developed based on the radial slippage propagation theory,which could prevent the occurrence of relative motion of the external and internal threads in the radial direction and thus block slippage propagation.Experiments validated its superior anti-loosening and anti-fatigue performances,and the convenience of installation and removal.