Method for acquiring bolted connection bonding surface stress distribution

Abstract

The invention discloses a method for acquiring bolted connection bonding surface stress distribution. The method is characterized by comprising the steps that a bolted connection structure, all connected pieces and material parameters are tested, and a global cylindrical coordinate system (r,theta,z) and a local cylindrical coordinate system (r,theta,z<j>) are established; the connected pieces are divided into a series of thin layer structures; a state equation is established, and bolt hole boundary characteristic processing is performed, wherein u<(j)>, w<(j)>, tau<(j)><zr> and sigma<(j)><z> are selected to serve as state variables; an input-output variable mapping relation of each thin layer is expressed, and the transmission law of thin layer mechanical characteristics is linearized; input-output mapping transformation is performed on all the thin layers in the bolted connection structure successively; and theoretical analysis data and test data are compared to determine an optimal number of thin layers calculated adaptive to the corresponding structure. Through the method, theoretical and test results of surface pressure distribution can be obtained quickly and accurately, and the optimal number of thin layers can be obtained according to the theoretical and test results.

Description

technical field [0001] The invention relates to a method for quickly and accurately obtaining the stress distribution of the joint surface of the bolt connection. More specifically, the invention provides a method for calculating the bolt connection by layering the bolt connection structure and combining the stress / displacement transfer between layers and the boundary relationship combined surface stress method. Background technique [0002] Bolt connection structure is the most important connection form of mechanical assembly. Industries such as aerospace, automobile, major equipment, new energy, and CNC machine tools generally use bolts for mechanical product connection. The mutual contact surface between multiple connected parts in the bolted connection structure is the "joint surface". The stress distribution of the bolted joint surface has a significant impact on the static, dynamic and thermodynamic properties of the mechanical system, and the stress distribution state...

AI Technical Summary

Problems solved by technology

In addition, the calculation of the stress field of the bolted joint surface is a contact nonlinear problem. The finite element method requires a lot of memory and low calculation efficiency when solving such problems; the finite element simulation results often depend on high-quality meshes, which also limits the limited Efficiency of meta-methods in solving such problems

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