Three-Dimensional Fractal Finite Element Model and Experimental Study on Elastoplastic Contact of Bolted Connections
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 rela-tionship of each parameter on the joint stiffness models of bolted connection was analyzed.Finally,finite el-ement analysis and experimental research were carried out.By applying the established normal and tangen-tial 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 ex-perimental results of bolt connection.The results show that increasing the preload,working load,fractal di-mension,material property parameters,or decreasing the fractal dimension parameters can increase the stiff-ness 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.
bolt connectionthree-dimensional fractalelastoplastic contactjoint surface stiffnessfinite el-ement analysisexperimental research
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