摘要
在振动、冲击载荷作用下,螺栓连接结构呈现出明显的非线性迟滞现象,影响结构的整体性能。传统的动力学研究仅考虑连接界面的微观/宏观滑移,很少研究螺栓杆与孔壁之间由于界面滑移产生的接触力。基于BRAKE的RIPP模型,提出一种考虑能量损耗的“钉扎接触力”模型,以实现对切向力3个阶段的整体迟滞回线建模;基于该模型,分析预紧力以及摩擦因数对迟滞回线的影响。提出的模型与现有的研究结果吻合性良好,验证了整体迟滞模型的有效性。研究表明:摩擦因数和预紧力的增加会扩大迟滞回线所包围的面积,进而导致单个周期内切向滑移所造成的能量损耗逐渐增加;相比于摩擦因数,预紧力对微滑移阶段的迟滞特性影响更为明显。提出的模型可以反映出“钉扎”接触过程对迟滞特性的影响,有助于更好地揭示螺栓连接在冲击载荷下的响应特征及其非线性行为,为后续螺栓连接结构动力学建模提供帮助。
Due to the impact load,the bolted joint structure shows obvious nonlinear hysteresis phenomenon,which will affect the overall connectivity of the structure.Traditional dynamic research only considers the micro/macro slippage of the joint,and rarely studies the pinning force caused by the collision between the bolt rod and the hole wall.Based on the BRAKE’s RIPP model,a new“pinning contact force”model considering energy loss was proposed,so as to realize the modeling of the overall hysteresis loops of the three stages of tangential force.The influence of preload and friction coefficient on hysteresis loop was analyzed based on this model.The proposed model is in good agreement with existing research results,verifying the validity of the overall hysteresis model.The result shows that the increase in friction and preload will expand the area enclosed by the hysteresis loop,leading to a gradual increase in energy loss caused by tangential slip within a single cycle.Compared to the friction coefficient,the preload has a more significant impact on the hysteresis characteristics of the micro slip stage.The proposed model can reflect the influence of“pinning”contact process on hysteresis characteristics,help to better reveal the response characteristics and nonlinear behavior of bolted joints under impact load,and provide help for the subsequent dynamic modeling of bolted joints.
作者
宫明光
刘文光
杨洋
张功平
李冀
GONG Mingguang;LIU Wenguang;YANG Yang;ZHANG Gongping;LI Ji(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang Jiangxi 330063,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2023年第8期168-173,共6页
Lubrication Engineering
基金
江西省自然科学基金项目(20224ACB204015)。
