预紧力状态螺栓连接结构动力学响应的一种数值方法研究  

STUDY ON A NUMERICAL METHOD FOR THE DYNAMIC RESPONSE OF BOLTED STRUCTURE UNDER PRETENSION AND IMPACT LOADS

作　　者：郭历伦[1] 陈忠富[1] 罗景润[1] 陈刚[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》2015年第6期1119-1123,共5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：基于螺纹连接的精细有限元模型,提出了预紧力状态螺栓连接结构动力学响应的一种数值模拟方法。针对螺纹接触,采用常规接触面定义方法定义了两组螺纹接触对,以对称罚函数法处理螺纹接触,并采用指数型接触压力-过盈关系;在已建立螺纹连接旋转模型条件下,采用直接在六角螺母的一对侧面上直接施加力偶矩的方法定义预紧力载荷,较传统方法更简单,且与实际更相符;采用先进行纯预紧力状态下的静力学响应分析,再将分析结果作为动力学响应分析的初始构型的方法,解决了预紧力载荷静态响应和冲击载荷动态响应间的静动耦合问题。最后,针对预紧力状态下口型含螺栓连接结构在钢球撞击下的响应问题,采用该方法进行了动力学响应分析,并将计算结果与实验结果进行了比较。误差分析结果表明,小球3 m和5.5 m跌落撞击条件下,应变响应前两个波脉宽以及幅值,计算结果与实验结果误差在20%以内。Base on the meticulous model of threaded bolt,one numerical method to research the dynamic response of structure with threaded bolt under pretension is presented. In the method,balanced penalty function method is used to deal with the thread contact problem,and the exponential pressure-overclosure is adopted. Pretension force is defined as a couple on the nut directly,since the helical model of the thread is obtained. Compared to the traditional pretension modeling method,it is not only simpler but also more reasonable. A method used to solve the static and dynamic coupling problem is presented,since the structure is under the static pretension force and the impact load synchronously. Firstly,the static response for the structure under pure pretension is analyzed. Then,the dynamic response is calculated taking the statically deformed state as the initial reference.For the mouth shape bolted structure,the numerical method presented in this article was used to study the dynamic response. The strain history of the thread bar was identical to the experiment results perfectly,and the maximal relative error of the pulse width or amplitude of the strain wave was less than twenty percent.

关 键 词：螺纹连接 数值方法 预紧力 动态响应 

分 类 号：O342[理学—固体力学]