紧固件连接柔度的解析与试验研究  

INVESTIGATIONS ON THE FASTENER FLEXIBILITY IN MECHANICALLY FASTENED JOINTS

作　　者：舒怀[1] 李亚智[1] 刘向东[1] 李彪[1] 

机构地区：[1]西北工业大学航空学院,西安710072

出　　处：《工程力学》2013年第3期470-475,480,共7页Engineering Mechanics

摘　　要：紧固件柔度是机械连接结构设计分析中非常关心的连接特性参数。欧洲工程科学数据库(ESDU)中的98012分部基于弹性基础梁理论,提出计算紧固件连接单钉柔度的基本方程、控制微分方程及其通解形式。该文在此基础上,提出修正的基本方程和边界条件,可将ESDU方法推广应用于不同材料和不同板厚的单搭接和双搭接连接的柔度分析。作为对比,试验测定和计算了几组复合材料-金属单搭接单钉连接件的柔度值,并建立了连接件三维实体有限元模型。连接柔度计算表明,该文改进的ESDU算法的结果与实测结果和有限元分析结果吻合良好。通过计算探讨了板沉陷系数、板剪切刚度和钉头约束等几个参数对连接柔度预测的影响。The fastener flexibility is one of the major concerns in the strength analysis and design of the mechanical fastened joints. A method for determining the fastener flexibility, based on the theory of beam on elastic foundation, has been proposed in the ESDU （Engineering Sciences Data Unit） Datasheet 98012. In this paper, some equations and boundary conditions of ESDU＇s approach are modified and their usage is extended to both single and double-lap joints in which the joint plates may be of different materials and/or different thickness. A series of tests were carried out to measure the tensile flexibilities of single-bolt and single-lap metal to composite joints. Three dimensional finite element models of the specimens were established as well. The predicted results of the specimen flexibilities using the modified method show good agreements when compared with those from experiments and finite element analysis. The effects of certain parameters, such as the foundation stiffness, the fastener head constraint and the equivalent plate shearing area, on joint flexibility were also investigated.

关 键 词：紧固件 连接件 弹性基础梁 柔度 控制方程 

分 类 号：O342[理学—固体力学] O343[理学—力学]