针对螺栓连接的可靠性和紧密性问题，研究切向载荷作用下预紧力对紧螺栓连接结合面微滑状态下等效刚度以及微滑移-宏观滑移临界响应幅值的影响。以单搭单螺栓连接板为对象，分析结合面接触压力和预紧力的关系，在研究连接板位移载荷特性的基础上，构建螺栓连接板的等效刚度模型；基于有限元法开发变预紧力的单搭螺栓连接板参数化模型，提出位移载荷响应计算方法；探讨预紧力对微滑阶段螺栓连接板的位移-载荷响应的影响，分析预紧力对微滑移-宏观滑移临界响应幅值和等效刚度的作用。结果表明，当连接板自由端位移响应幅值小于0.075 mm时，预紧力变化对位移载荷响应没有影响，螺栓连接板等效刚度渐硬；当位移响应幅值大于0075 mm时，预紧力对等效刚度影响明显；微滑移-宏观滑移临界响应幅值与预紧力大小呈近似线性关系。当预紧力为\[0.15~0.33\]F0max（F0max为最大预紧力）或\[0.45~0.70\]F0max时，预紧力变化对连接刚度影响很小，预紧力对等效连接刚度的影响可达到50%。研究表明，切向载荷作用下的摩擦式螺栓连接，改变预紧力可调节螺栓连接板的等效刚度和微滑移-宏观滑移临界响应幅值，综合考虑可为螺栓连接板的力学设计提供新思路。
The effects of pretightening force on the equivalent stiffness and the critical response of micro and macro sliding of the bolted joint were investigated in order to realize the tightening and reliability of bolted joints.A singlelap single bolted joint plate was used to analyze the relation of contact pressure of joint surfaces and the pretightening forces,its equivalent stiffness model was built by analyzing the characteristic of the displacementloading,a parametric finite element model of the singlelap and single bolted joint plate with a variable pretightening force was developed,and a calculation method of response of displacementloading was proposed.The effects of pretightening force on the response of displacementloading of bolted joint plate at micro sliding phase,as well as the equivalent stiffness and the critical response amplitude of micro and macro sliding were discussed.Results indicate that when the response amplitude of displacementloading of the free end of the bolted joint plate is smaller than 0.075 mm,the pretightening force has no influence on the response of displacementloading,and the equivalent stiffness of the bolted joint plate is getting harder.When the response amplitude of displacementloading is greater than 0075 mm,the pretightening force has obvious influence on equivalent stiffness.There is an approximate linear relationship between the critical response amplitude of micro and macro sliding and the pretightening force.When the pretightening force is \[0.15~0.33\] F0max(F0maxis the maximum pretightening force) or \[0.45 ~ 0.70\] F0max,the pretightening force has less influence on equivalent stiffness,while the effect of pretightening force on the equivalent stiffness reaches to 50%.The conclusions show that the critical response amplitude and the equivalent stiffness of the bolted joint plate can be adjusted by changing the prettightening force.It is very helpful to the design of bolted joint plate by considering both of them.
刘文光. Effects of Pretightening Force on Response of Displacement Loading of Tightened Bolted Joint Plate[J]. Lubrication Engineering,2018,43(3):75-80.