Finite element parametric study of the split sleeve cold expansion on residual stresses and pulling force

Dey, Mithun K; Kim, Dave; Tan, Hua

doi:10.1177/09544062211025563

Cited by 3 publications

(3 citation statements)

References 34 publications

(78 reference statements)

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“…Статистика руйнувань свідчить, що 50-90 % втомних тріщин зароджується поблизу конструктивних з'єднань [1].…”

Section: вступunclassified

Експериментальне Дослідження Впливу Плівкоутворюючих Антикорозійних Сполук На Втому Заклепкових З’єднань

Gavrylov

2024

aktt

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The subject matter of this article is the influence of film-forming corrosion preventive compounds on aviation riveted joints fatigue life. The goal of this work is to develop a method for the assessment of negative side effects caused by the application of corrosion preventive compounds. Tasks of the work are as follows: analysis of the aircraft corrosion problem; critical review of existing publications concerning possible negative side effects caused by the application of corrosion preventive compounds for protection of aviation riveted joints against corrosion, where reduction of the fatigue life is considered as a result of the preventive compounds penetration into the gaps of riveted joints; development of the specimen for fatigue tests, with features of contemporary transport aircraft typical design; fatigue tests of the riveted specimens treated with preventive compounds and without treatment; investigation of the preventive compounds penetration into the gap of riveted joint. The main method of this research is fatigue loading of the riveted specimens at loads close to those the aircraft encounters in service. The main result is the experimentally proven possibility of negative side effects of corrosion preventive compound application. The observed effect is explained by the change in friction in joints and the corresponding redistributions of the forces between the joint elements. It was found that a factor influencing friction force is the viscosity of the preventive compounds. The possibility of preventing negative side effects by optimizing the protective procedure has been experimentally proven. Conclusions. The results presented in the paper show the probability of the negative side effects of corrosion preventive compound application. Considering the variety of these materials and their physical and chemical characteristics, the necessity of the grounded selection of the protective compounds is evident as well as the optimization of the treatment technology. Conducted research has revealed an example of the negative influence of preventive compounds on riveted joints fatigue life and has opened the way for this effect prevention. The described research procedure is a component of the complex method for exploring corrosion preventive compounds’ negative side effects.

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“…Статистика руйнувань свідчить, що 50-90 % втомних тріщин зароджується поблизу конструктивних з'єднань [1].…”

Section: вступunclassified

Експериментальне Дослідження Впливу Плівкоутворюючих Антикорозійних Сполук На Втому Заклепкових З’єднань

Gavrylov

2024

aktt

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“…Dey et al developed a three-dimensional finite element model of SSCE and studied variable material properties and expansion percentage parameters. Their study revealed that the yield strength of aluminum specimens and the percentage of CE of split sleeves improved the effect of annular residual stresses around the hole [ 22 ]. Lu et al studied the effect of composite hole expansion treatment.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Split Sleeve Cold Expansion Process on Multiple Hole Aluminum Alloy

et al. 2023

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Multiple cold expansion holes are widely used in connection areas of aircraft structures, in order to achieve uniform load transfer of the skin or connection parts. Split sleeve cold expansion (SSCE) is widely used to enhance the fatigue life of fastener holes by applying compressive residual stresses around the holes. In this study, the finite element method (FEM) was used to research the distribution and variation of residual stresses along the hole edges of 7075AA single-hole and multi-hole cold expansion (CE) specimens. Full-field strain measurements of single-hole and multi-hole specimens were performed using two-dimensional digital image correlation (DIC), and the residual stress and strain at the hole edge of the specimens measured by FEM and DIC were compared. FEM results shows that the maximum circumferential and radial residual stresses of three-hole specimens with three-hole spacing are increased by 5.37% and 31.53% compared with single-hole specimens. The maximum circumferential residual stress of three-hole specimens with four-hole spacing increases by 7.25% compared with a single hole, but the radial residual stress decreases by 12.98%. In addition, for three-hole specimens with hole spacing three times the hole diameter, the strengthening effect of SSCE in the order of middle hole, then left hole, and, finally, right hole is better than that of SSCE in the order of left to right hole. FEM and DIC full-field strain results are basically consistent.

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“…Additionally, they investigated the distribution and variation of residual stresses at the edge of the hole in the cold expansion specimens. Dey et al found that increasing the yield strength of the aluminum workpiece and the percentage of expansion of the split sleeve cold expansion (SSCE) improved the hoop-oriented residual stresses around the cold-expanded holes [17]. However, the yield strength of the workpiece had a greater effect on the residual stress field.…”

Section: Introductionmentioning

confidence: 99%

Research on the Residual Stress Field of a Compression Bushing-Lug Plate in Cold Expansion Strengthening

Lin,

Bai,

Wang

et al. 2023

Applied Sciences

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The accurate acquisition of the residual stress field is the key to clarifying the cold expansion strengthening mechanism of compression bushings, optimizing the extrusion process parameters, and improving the structural fatigue life. In the actual cold expansion strengthening process, the resultant distribution of residual stresses is influenced by the relative extrusion amount, mandrel structure, material properties, and extrusion speed. In this article, the distribution patterns of residual stress after cold extrusion are investigated through a combination of finite element simulation and experimental measurements using a micro-region stress tester. To examine the redistribution law of the stress field of cold expansion reinforcement under external load, the compression bushing-lug-plate-reinforced structure is loaded and unloaded. The results show that large circumferential residual compressive stresses are distributed in the hole wall of the compression bushing after cold expansion. Radial residual stresses are also compressive stresses, although the values are small. In addition, the reinforced structure after cold extrusion presents a large difference in the stress redistribution rules compared with cold extrusion after the load is applied and removed.

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Finite element parametric study of the split sleeve cold expansion on residual stresses and pulling force

Cited by 3 publications

References 34 publications

Експериментальне Дослідження Впливу Плівкоутворюючих Антикорозійних Сполук На Втому Заклепкових З’єднань

Експериментальне Дослідження Впливу Плівкоутворюючих Антикорозійних Сполук На Втому Заклепкових З’єднань

Finite Element Analysis of Split Sleeve Cold Expansion Process on Multiple Hole Aluminum Alloy

Research on the Residual Stress Field of a Compression Bushing-Lug Plate in Cold Expansion Strengthening

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