螺栓联接结合面三维分形刚度模型与实验研究  

Three-Dimensional Fractal Finite Element Model and Experimental Study on Elastoplastic Contact of Bolted Connections

作　　者：王雪[1] 李小彭[1] WANG Xue;LI Xiaopeng(School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学机械工程与自动化学院,沈阳110819

出　　处：《组合机床与自动化加工技术》2024年第7期1-6,11,共7页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金资助项目(51875092)。

摘　　要：为更准确地分析螺栓联接体的静动态特性,根据三维分形理论,考虑微凸体弹塑性接触在内的4种变形阶段,分别得到螺栓联接结合面的法向载荷与切向载荷,进而建立了螺栓联接结合面法向刚度与切向刚度模型,并分析了各参数对螺栓联接结合面刚度模型的影响关系。开展了有限元分析与实验研究,应用所建立的法向刚度与切向刚度模型,将考虑结合面影响的螺栓联接体有限元分析结果分别与忽略结合面影响的螺栓联接体有限元分析结果以及实验结果对比。研究结果显示,增大预紧力、工作载荷、分形维数、材料特性参数,或是减小分形尺度参数,可增大螺栓联接结合面的刚度;应用所建立结合面刚度模型的螺栓联接体有限元分析结果与实验结果误差在8%以内,远小于忽略结合面影响的有限元分析误差。In order to analyze the static and dynamic characteristics of bolted connection more accurately,based on the three-dimensional fractal theory,considering four deformation stages including the elastoplastic contact of micro convex bodies,the normal and tangential loads of bolted joint surface were obtained,and then the normal and tangential stiffness models of bolted joint surface were established.The influence relationship of each parameter on the joint stiffness models of bolted connection was analyzed.Finally,finite element analysis and experimental research were carried out.By applying the established normal and tangential stiffness models,the finite element analysis results of bolt connection considering the influence of joint surface were compared with the finite element analysis results ignoring the influence of joint surface and experimental results of bolt connection.The results show that increasing the preload,working load,fractal dimension,material property parameters,or decreasing the fractal dimension parameters can increase the stiffness of bolted joint surface;and the error between the finite element analysis results of the bolted connection body using the established joint surface stiffness model and the experimental results is within 8%,which is much smaller than the finite element analysis error that ignores the influence of the joint surface.

关 键 词：螺栓联接 三维分形 弹塑性接触 结合面刚度 有限元分析 实验研究 

分 类 号：TH16[机械工程—机械制造及自动化] TG502[金属学及工艺—金属切削加工及机床]