航空燃油管路焊缝分区域建模及其对管路力学特性影响研究

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中图分类号：V228；O324DOI：10.3969/j.issn.1004-132X.2025.09.002 开放科学（资源服务）标识码（OSID）：

Modeling of Aviation Fuel Pipe Welds in Different Regions and Its Effect on Mechanics Properties of Pipes

GUO Changhong1DI Mengran1 GONG Hanwen1QUAN Lingxiao1.2*LI Bin1.2 1.School of Mechanical Engineering，Yanshan University，Qinhuangdao，Hebei，O66004 2.Hebei Province Laboratory of Heavy Machinery Fluid Power Transmission and Control，Qinhuangdao， Hebei，066004

Abstract：Aircraft fuel lines contained various structures such as bends，branches and welded seams， which exhibiedted complex fluid-solid coupling mechanics behaviors under external loads and internal fluid coupling. The microstructural parameters of the welded areas were obtained through metallographic testing and microtensile testing，and ahigh-precision finite element model of the welded fuel lines with diferent lo cal structures was constructed.The modal test results show that the errors between tests and simulations are less than 10% ，which verify the accuracy of modelling and simulation. The effects of different branch pipe bending radiiand pipe diameter ratios on the mechanics properties ofthe pipelines were investigated. It is found that increasing the bending radii and pipe diameter ratios may help to make the distribution of the flow velocity and pressure fields in the pipelines more uniform，and the intrinsic frequency decreases with the increase of the bending radius；and when the bending radius decreases but the pipe diameter ratio increases，the peak of the random vibratory stresses decreases.The applications of a fuel line model that accurately models welded seams to analyze the efect of local structures on the mechanics properties of the line may provide a basis for line design and optimization.

Key words： coherently welded fuel line；refined modeling；local structure； fluid-solid coupling vibration；mechanics property；modal test

0 引言

近十年来，我国在飞机自主研发方面取得了重大进展。（剩余14692字）