Coupled buckling and plastic instability for tube hydroforming

Nefussi, Germaine; Combescure, Alain

doi:10.1016/s0020-7403(02)00031-0

Cited by 57 publications

(41 citation statements)

References 17 publications

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“…It can be seen clearly that both the wrinkles of 5A02 and 0Cr18Ni9 tube can be fitted accurately using the GaussAmp function. The wrinkles of 0Cr18Ni9 tube is fatter than that of 5A02 tube, while the radius of the wave bottom for the 0Cr18Ni9 tube is bigger 06002-p. 4 ICNFT 2015 than that of the 5A02 tube. Moreover, the distance between two wrinkles is shorter for the 0Cr18Ni9 tube.…”

Section: Wrinkling Behavior Of Different Tube Materialsmentioning

confidence: 94%

“…Either wrinkling or buckling of tubes can be caused by excessive axial compressive stress due to axial feeding [1,2]. Wrinkle was always considered as one of the defects of tubes in the past investigations, which must be avoided as far as possible [3][4][5][6]. However, it is believed by Yuan et al [7] that not all wrinkles are defects and that the concept that some wrinkles can be controlled and used in tube hydroforming was proposed to improve the formability of tubes.…”

Section: Introductionmentioning

confidence: 99%

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Wrinkling behavior in tube hydroforming coupled with internal and external pressure

Cui

Wang

Yuan

2015

MATEC Web of Conferences

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Abstract. Control and use of wrinkles is a challenge in tube hydroforming because wrinkle was always considered as one of the defects of tubes from the traditional view. In this paper, a dedicated experimental setup was designed and manufactured, using which the investigation of wrinkling behavior coupled with internal and external pressure can be realized. The effect of internal or external pressure on 5A02 aluminum alloy tubes and 0Cr18Ni9 stainless steel tubes were all investigated using this setup. It was found that the number and shape of wrinkles are strongly dependent on the internal or external pressure. More important is that the geometrical configuration of wrinkles can be perfectly characterized using the Gauss function rather than the sine function adopted in the published literature. In addition, the fitted Gauss functions for every wrinkle were integrated in order to compare their area with the corresponding area of die cavity, so as to obtain the appropriate process parameters for the useful wrinkle, which can be formed in advance and then flatted in the calibration stage.

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Section: Wrinkling Behavior Of Different Tube Materialsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Wrinkling behavior in tube hydroforming coupled with internal and external pressure

Cui

Wang

Yuan

2015

MATEC Web of Conferences

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“…The obtained FLDs can be used to optimize the hydroforming tool geometries and also to develop criterion for material failure. ''Open-die'' hydroforming is one of the most popular methods used to obtain FLD for circular tubes of various materials [10][11][12][13][14]. Figure 2 presents the process of hydroforming tubular parts.…”

Section: Fig 1 Exhaust Parts Produced By Hydroforming [6]mentioning

confidence: 99%

Quality of the Hydroformed Tubular Parts

Ceclan

Bâlc

Grozav

et al. 2013

AEF

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“…The latest studies are devoted to the mechanical and numerical modelling of the hydroforming processes using the finite element analysis [6][7][8][9][10], allowing the prediction of the material flow and optimisation of hydroforming parameters [11][12][13][14][15][16][17][18][19]. In addition, the accuracy of the numerical a Corresponding author: bouchaib.radi@yahoo.fr prediction remains linked to the fidelity models representing the behaviour of the WT and particularly the mechanical properties (plasticity metal flow, anisotropy effect and damage initiation and growth) of the base metal (BM) and the welded joint (WJ) zone [20][21].…”

Section: Introductionmentioning

confidence: 99%

Optimization technics to identify the characteristics of a hydroformed structure

Radi

Cherouat

Hami

et al. 2010

Int. J. Simul. Multidisci. Des. Optim.

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-This paper presents an experimental/numerical methodology which aims to improve 3D welded tube considering their anisotropic effect, geometrical singularities found in the welded joint, and heat affected zone behaviour by hydroforming process. This process contributes to reduce the number of welding and assembly operations needed to generate complex structures, while improving the weight saving and quality of finished parts. In spite of the advances in the performance of this manufacturing technology, some problems are linked to particularities of certain raw materials and additional studies must be developed, like in the case of welded tubes. The experimental study is dedicated to the identification of stress-strain flow of the base metal and the heat-affected zone from the global measure of tube displacement, thickness evolution and internal pressure expansion. Nanoindentation test is adapted to investigate the heat affected zone mechanical behaviour. Workpiece behaviour's models used to simulate the expansion tests, made it possible to highlight the combined effects of the inhomogeneous behaviour of basic material and heat affected zone, as well as the geometrical singularities found in the welded tubes. From the simulations carried out, it is clear the influence of the plastic flow behaviour of the welded tube in the final results (thickness distribution, stress instability, tube circularity, critical thinning and rupture).

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Coupled buckling and plastic instability for tube hydroforming

Cited by 57 publications

References 17 publications

Wrinkling behavior in tube hydroforming coupled with internal and external pressure

Wrinkling behavior in tube hydroforming coupled with internal and external pressure

Quality of the Hydroformed Tubular Parts

Optimization technics to identify the characteristics of a hydroformed structure

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