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Study on the Load Conversion of Bolt-Nut Fasteners between Tightening and Service Conditions
Experimental Techniques ( IF 1.6 ) Pub Date : 2021-03-03 , DOI: 10.1007/s40799-021-00448-2
C. Lv , A. Liu , D. Liu , F. Zhang , W. Yang

Abstract

At present, the common method to realize the pre-tightening effect of threaded fasteners is by applying an accurate tightening torque on them. However, when removing the tightening torque, the load characteristics will have a transient conversion, so that the pre-tightening loads will be significantly different from the tightening condition. For the aim of understanding the pre-tightening effect under the service condition, it is important to model the load conversion between tightening and service conditions. Based on the most basic mechanical equilibrium analysis, the load characteristics of bolt-nut fasteners under a round of the tightening and service conditions were studied. The torque equilibrium equations were built respectively, the load conversion between two conditions was analyzed and an approximate relationship between the applied tightening torque under the tightening condition and the pre-tightening torque under the service condition was obtained. In the meanwhile, a dynamic strain measuring system was proposed to accurately determine the pre-tightening loads in real time. Results verified that the thread torque and the bearing friction torque balance each other and act as pre-tightening torques under the service condition. The final pre-tightening loads can be roughly estimated to be larger than half of the difference in tightening torques by wrenches, but smaller than half of the sum of tightening torques, or can be accurately measured through dynamic strain measurements.

Highlights

• We study on bolt-nut fasteners , load characteristics under tightening and service conditions.

• We model the relationship between the pre-tightening torque and the applied tightening torque.

• We verify that the pre-tightening torque is apparently determined by the friction on the contacting interface.



中文翻译:

螺栓螺母紧固件在拧紧和使用条件之间的载荷转换研究

摘要

目前,实现螺纹紧固件预紧效果的常用方法是在螺纹紧固件上施加精确的拧紧扭矩。但是,当去除拧紧扭矩时,负载特性将具有瞬态转换,因此预拧紧负载将与拧紧条件明显不同。为了了解使用条件下的预紧效果,对在拧紧条件和使用条件之间的载荷转换进行建模很重要。基于最基本的机械平衡分析,研究了一轮拧紧和使用条件下螺栓螺母紧固件的载荷特性。分别建立了扭矩平衡方程,分析了两个条件之间的负载转换,并获得了在拧紧条件下施加的拧紧扭矩与在使用条件下的预拧紧扭矩之间的近似关系。同时,提出了一种动态应变测量系统,可以实时准确地确定预紧载荷。结果证明,螺纹扭矩和轴承摩擦扭矩彼此平衡,并在使用条件下充当预紧扭矩。最终的预紧载荷可以粗略估计为大于用扳手拧紧扭矩差的一半,但小于拧紧扭矩总和的一半,或者可以通过动态应变测量准确地进行测量。

强调

•我们研究螺栓螺母的紧固 拧紧和使用条件下的载荷特性。

•我们对预拧紧扭矩和所施加的拧紧扭矩之间的关系进行建模。

•我们确认预紧扭矩显然是由接触界面上的摩擦力决定的。

更新日期:2021-03-04
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