多螺栓连接结构预紧力实验研究  

EXPERIMENTAL STUDY ON THE PRETENSION FORCE OF MULTI-BOLTED STRUCTURE

作　　者：郭历伦[1] 陈忠富[1] 罗景润[1] 

机构地区：[1]中国工程物理研究院总体工程研究所,绵阳621999

出　　处：《机械强度》2016年第6期1205-1210,共6页Journal of Mechanical Strength

基　　金：中国工程物理研究院科学技术基金项目(11302211)资助~~

摘　　要：开展多螺栓连接结构预紧力实验研究,获得了其在纯拧紧力矩作用下的预紧力及其响应规律。研究采用应变片测试方法,首先对单螺栓连接结构进行了预紧力实验,获得了不同拧紧力矩条件下螺杆上的轴向应变、轴向应力及预紧力,并通过与经验公式计算结果比较,验证了预紧力测试方法的合理性。在此基础上,开展了多螺栓连接结构预紧力实验研究。为比较相同拧紧力矩条件下,多螺栓连接结构与单螺栓连接结构预紧力水平间的差异,定义了预紧力比例因子Kpro。实验结果表明,由于螺栓组内部各螺栓间的相互影响,其预紧力水平明显低于单螺栓结构,并与螺栓拧紧状态相关。就本文所采用的多螺栓连接结构而言,在拧紧力矩较低、螺栓尚未完全拧紧时,Kpro为0.70.8,其预紧力水平为单螺栓结构的0.70.8倍;当拧紧力矩较高、螺栓处于稳定的拧紧状态时,Kpr为0.6左右,其预紧力约为单螺栓结构的0.6倍。The pre-tension force of a multi-bolted structure under pure tightening torque is studied by experimental methods. Firstly, Experiment for single bolted structure is implemented, whose pretension force is obtained by strain gauge method. It shows that this pretension force measurement method is reasonable by comparing the experimental results and the theoretical results. On this basis, the experiment for multi-bolted structure is operated. The results shows that its pretension force is lower than the single bolted structure, and its value is relating to the pretension state of the bolt. When the pretension state is stable, its pretension force is about 0. 6 times of the single bolted.

关 键 词：螺栓连 预紧力 拧紧力矩 力矩系数 

分 类 号：O342[理学—固体力学]