Connection structure rigidity degradation analysis method and device, electronic equipment and medium

Abstract

The invention relates to a connection structure rigidity degradation analysis method and device, electronic equipment and a medium, and the method comprises the steps: using quartic polynomial distribution as a function for representing contact pressure distribution, and dispersing a contact pressure circular region into annular belts, wherein each annular belt corresponds to an elastic-plastic unit, and the friction shear stress obtained by multiplying the contact pressure integral of the annular belt by the friction factor and the tangential sliding critical force of the sliding block form a corresponding relation; establishing an equation of the relation between the friction shear stress and the area; and solving the root of the equation, and obtaining a distribution function of the friction shear stress, wherein the distribution function is composed of variables and four parameters, and the four parameters are obtained through pressure intensity distribution and connection structure size recognition. Through quartic polynomial pressure distribution fitting, the excellent performance of the quartic polynomial in representing the connection contact pressure distribution is verified. Based on the nonlinear distribution, a calculation method of a corresponding distribution function is provided, and a distribution function curve of the friction shear stress is obtained.

Description

technical field [0001] The invention relates to the technical field of establishing a model for describing the stiffness degradation of a bolted connection based on the Coulomb friction principle, and in particular relates to an analysis method, device, electronic equipment and medium for the stiffness degradation of a connection structure. Background technique [0002] Bolted connections are widely used in various mechanical structures, including aerospace and weaponry fields. The system composed of bolted connections usually experiences frequent external vibration loads. The dynamic characteristics of the overall structure are related to the reliability of the structure, etc. Therefore, it is of great significance to study the dynamic behavior of bolted connections under external loads. The bolted connection introduces multiple contact surfaces while realizing the mutual combination of independent structures, which has a significant impact on the dynamic characteristics of...

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Problems solved by technology

[0004] Although the Iwan model can better characterize the stiffness degradation phenomenon, it basically does not consider the relationship between the interface contact pressure distribution and the friction behavior. Many scholars have begun to study the physical mechanism behind the stiffness degradation phenomenon...

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