Analysis method for bonding strength of urban rail vehicle body composite material

Abstract

The invention provides an analysis method for bonding strength of an urban rail vehicle body composite material. The method comprises the steps that first, a global finite element model comprising a body framework, cement and a skin is established; second, a body framework finite element model corresponding to the global finite element model and multiple local finite element models comprising local skins and cement are established, wherein the local skins of the local finite element models form the skin in the first step; third, strength analysis is performed on the body framework finite element model, and displacement of multiple joints O' in the body framework finite element model is obtained, wherein the joints O' correspond to cementing points of the global finite element model; and fourth, the displacement of the joints O' in the body framework finite element model is loaded to multiple joints O corresponding to the local finite element models for strength analysis. Through the analysis method, the calculation scale is small, calculation cost is low, calculation efficiency is high, and the calculation result tends to be safe.

Description

technical field [0001] The invention relates to an analysis method of bonding strength, in particular to a method for analyzing the bonding strength of composite materials of an urban rail vehicle body. Background technique [0002] The body of an urban rail vehicle is generally composed of a car body frame and a skin. In order to achieve light weight, it has become a future development trend to use lightweight composite materials as the skin. Traditional connection technologies such as welding cannot meet the requirements for the connection between composite skin and car body frame, and adhesive bonding has become a new connection technology with good application prospects. In order to ensure the bonding strength of the skin, the corresponding strength analysis of the skin is required in the design stage. [0003] The traditional skin bonding strength analysis method is usually to establish the overall finite element model of the car body skeleton, adhesive and skin for an...

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Problems solved by technology

[0003] The traditional skin bonding strength analysis method is usually to establish the overall finite element model of the car body skeleton, adhesive and skin for analysis; due to the large area of ​​the skin and the small thickness of the adhesive layer, the unit mass of the adhesive layer must be satisfied. It will lead to a huge number of units in the overall finite element model. This analysis method has high requirements on computer hardware and computing power. Except for a small number of ultra-large high-performance computers, most computers cannot complete their calculation and analysis.