A new model for the expansion tube considering the stress coupling: Theory, experiments and simulations

Wu, M.Z.; Zhang, X.W.; Zhang, Q.M.

doi:10.1016/j.dt.2021.05.010

Cited by 12 publications

(2 citation statements)

References 23 publications

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“…Over the recent years, various energy absorber systems have been introduced and enhanced in pursuit of this goal. Expansion, [1][2][3][4][5] inversion, 6 crushing, 7,8 expanding-splitting [9][10][11][12] and shrinking-expanding of a deformable tube are different types but effective kind of energy-absorbing 13 approaches to improve the energy absorption characteristics of circular deformable tubes. The expansion angle and coefficient of friction between the deformable tube and mandrel are two main factors affecting energy absorption.…”

Section: Introductionmentioning

confidence: 99%

Investigation of circular aluminium tube expansion by rigid die as energy absorbers using digital image correlation technology

Gupta,

Kumar,

Singh

2024

The Journal of Strain Analysis for Engineering Design

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This paper investigates the expansion of circular aluminium tubes using a rigid die under quasi-static loading conditions through experiments and finite element simulations. This study primarily focuses on the expansion of thin-walled tubes with a thickness ranging from 3.95 to 5 mm, and the finite element model is in good agreement with the experimental results. Additionally, the study emphasizes the impact of the coefficient of friction, energy dissipation properties and the diameter-to-thickness ratio on the energy expenditure associated with the expansion process of aluminium tubes using a rigid die. This study use Digital Image Correlation (DIC) technology to evaluate pictures obtained during experimental procedures, enabling accurate quantification of displacements, stresses, and rotations of major planes. The findings indicate that the energy absorption resulting from friction plays a significant role, with the coefficient of friction serving as a important parameter throughout the expansion process. The energy absorbed by the friction between tube-die contact surfaces was significantly higher than that absorbed by the plastic bending of the aluminium tube. For specimen AT-5.0-1, the energy absorbed by friction and bending is 3352 and 570 J, respectively. Result shows that a notable increase in the ultimate load, rising from 46.03 to 61.54 kN, is required for expanding the aluminium tube with a thickness of 3.95 to 5.0 mm. The local strain patterns seen on the surface of the tube offer useful insights, therefore enhancing researchers’ ability to examine particular points on the specimen’s surface without the need for fixed reference points prior to conducting experiments.

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Section: Introductionmentioning

confidence: 99%

Investigation of circular aluminium tube expansion by rigid die as energy absorbers using digital image correlation technology

Gupta,

Kumar,

Singh

2024

The Journal of Strain Analysis for Engineering Design

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“…Several works in the technical literature have dealt with the study of the mechanical expansion process of tubes for various applications with various materials and with different approaches: considering the energy absorption applications, a theoretical prediction supported by an experimental investigation was carried out by Tan et al 7 Theoretical analyses and models were also proposed by Wu et al, 8 Luo et al 9 and Liu and Qiu. 10 The plastic energy absorption of the aluminium tubes when the expansion was performed with conicalcylindrical die was analysed by Yang et al 11 The expansion of the tubes used in the petroleum industry was analytically investigated by Hwang and Chen 12 and by Pervez et al 13,14 working with FE models 13 and experimental tests.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the mechanical expansion process of thin-walled tubes for air heat-exchanger production

Scattina

Avalle

2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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Finned tube air heat-exchangers are built by joining the tubes to the fins by various techniques. A technique mostly used for large heat-exchangers consists of fitting the tubes into the holes of the fins by expanding the tubes using a mechanical process. The expansion is achieved by inserting an ogive of a larger diameter into the tube. The intimate contact of tubes and fins due to the press fitting ensures the proper thermal connection. This work tries to describe an experimental-numerical procedure useful to study and predict the mechanical process and the process parameters. The procedure, based on material properties obtained from tensile tests and the use of the inverse method to identify the material parameters, is based on bi-dimensional finite element (FE) models used to simulate the expansion process. The FE model is then used for process optimisation regarding such parameters as the ogive shape and ogive sizes, friction coefficient and speed of insertion of the ogive into the tube. Indeed, size and shape uncertainties strongly influence the process parameters and the process quality, as well as the heat-exchanger efficiency. The use of numerical models was proven highly effective in predicting and optimising the process by quickly analysing the influencing factors and optimising the production.

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Mechanical behavior and energy absorption of expansion circular tube with negative Poisson’s ratio

Qin,

Liu,

Wang

et al. 2024

Alexandria Engineering Journal

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A new model for the expansion tube considering the stress coupling: Theory, experiments and simulations

Cited by 12 publications

References 23 publications

Investigation of circular aluminium tube expansion by rigid die as energy absorbers using digital image correlation technology

Investigation of circular aluminium tube expansion by rigid die as energy absorbers using digital image correlation technology

Analysis of the mechanical expansion process of thin-walled tubes for air heat-exchanger production

Mechanical behavior and energy absorption of expansion circular tube with negative Poisson’s ratio

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