杠杆力作用下的螺栓联接刚度分析  

ANALYSIS OF BOLT JIONT STIFFNESS EFFECT WITH PRY FORCE

作　　者：刘晓雪[1,2] 郭翰飞[3] 张亚辉[1] 张有为[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,大连116021 [2]大连交通大学交通运输工程学院,大连116028 [3]大连交通大学机械工程学院,大连116028

出　　处：《机械强度》2017年第5期1105-1111,共7页Journal of Mechanical Strength

基　　金：国家自然科学基金(11402043)资助~~

摘　　要：螺栓联接由于自身简单和实用性强的特点成为工程结构中应用最广泛的联接形式,但是由于几何结构突变造成整个结构刚度的变化,使得螺栓成为整个结构设计过程中涉及参数最多的影响因素,明确刚度特性的变化规律对于进行包含该结构动力学分析是至关重要的前提。针对螺栓联接的一种受力形式杠杆作用分别讨论了两个影响因素:预紧力大小;杠杆力与螺栓中心的距离对联接刚度变化规律的影响。计算结果表明,较大的预紧力可以保证结构的初始刚度,但是影响较为有限,预紧力增加100%的条件下,初始刚度增加13%;杠杆力与螺栓中心的距离越短,联接结构的初始刚度就越大,该距离增加30%,刚度降低60%。并基于分析结果提出了双指数形式的拟合公式,并与计算结果进行对比分析验证了拟合公式的合理性,该计算结果可以为采用螺栓联接的工程结构提供刚度计算分析方法,为此类结构进行动力学分析提供了基础刚度的研究依据。Bolt joint is mostly used connection type in engineer structure for its simplicity and practicability feature,but the stiffness is changed for geometry alter which makes bolt joint design become the most important and it is essential to understand the dynamic characteristics of the whole structure. The preload and distance between centreline of bolt and prying force are discussed to confirm the affecting of stiffness. The results is shown that the initial stiffness of the structure is guarantee by preload,but the impact is more limited,preload increase of 100%,the initial stiffness increased by 13%. The distance between centreline of bolt and prying force is shorter the initial stiffness is greater,the distance is increased by 30%,the stiffness is reduced 60% reduction. Double exponential fitting formula is proposed and compared with the analysis results which provide stiffness calculation method is effect for bolt joint stiffness structures.

关 键 词：螺栓联接刚度 杠杆力 预紧力 参数拟合 

分 类 号：TB123[理学—工程力学]