Авіаційно-космічна техніка та технологія (Aug 2024)
A complex approach to the selection of film-forming anti-corrosion compounds for the protection aviation structures against corrosion
Abstract
This paper considers substantiated by experiments the selection of corrosion-preventing compounds for aircraft structures protection. The influence of corrosion-preventing compounds on the service life of typical riveted joints used in fuselages of planes of the transport category was studied. It was found that corrosion-preventing compounds penetrate the gaps of joints and influence the fatigue life under certain conditions. Based on the hypothesis regarding the influence of friction between the mating elements of joints on fatigue damage and fracture, a device to measure the static friction force between the joined elements in the presence of corrosion-preventing compounds was developed. An experimental study on the influence of an aviation corrosion-preventing compound on the friction forces was conducted. Finite Elements Analysis of the effect of corrosion-preventing compounds on the strain-stress state of the riveted joint elements was conducted. Results of the research on the negative side effects caused by the application of corrosion-preventing compounds are summarized. A study of the fatigue life of riveted joints after treatment with corrosion-preventing compounds, Finite Elements Analysis of the stress-strain state, and determination of the influence on friction are considered as primary components of the complex method for controlling corrosion- preventing compounds. Additional components of the complex method for the study of corrosion-preventing compounds were described. They extend the number of compounds characteristics. Additional components of the complex method are: determination of the influence of preventing compounds on the nucleation stage of fatigue damage, which can be conducted by the parameters of the surface deformation relief; the study of the influence of preventing compounds on fatigue crack propagation stage using linear fracture mechanics approaches; and the determination of the influence of preventing compounds on the secondary bending effect. A structural and logical scheme for assessing the negative side effects of corrosion-preventing compounds is proposed.
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