Control and use of wrinkles in tube hydroforming

Yuan, Shijian; Wang, Xiaosong; Liu, Gang; Wang, Z.R.

doi:10.1016/j.jmatprotec.2006.06.007

Cited by 62 publications

(27 citation statements)

References 2 publications

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“…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. The "useful" wrinkles should be formed in advance to accumulate materials in the expansion zone, and then they can be flattened in the subsequent calibration stage.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the shape and dimensions of the wrinkles should be controlled according to the optimal relationship between the internal pressure and axial feeding. In the previous attempting the wrinkles are assumed that distributed in the die cavity evenly and the wave shape of the wrinkle is described by a sine curve [7]. However, only the wave top of the wrinkle can be accurately described by a sine curve which is invalid for the wave bottom.…”

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: Introductionmentioning

confidence: 99%

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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“…They also introduced the Cockcroft and Latham's ductile failure criterion into a finite element analysis to predict the bursting failure of the workpiece. Yuan et al [2,3] studied the effects of loading path and length to diameter ratio on the number of wrinkles and part shape. They concluded that not all wrinkles were defects and that the key point in THP is to obtain useful wrinkles instead of dead wrinkles.…”

Section: Introductionmentioning

confidence: 99%

Prediction of failure in tube hydroforming process using a damage model

2007

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In tube hydroforming process (THP), two types of loading, internal pressure and axial feeding and in particular the combination of them, are needed to feed the material into the cavities of the die to form the workpiece into the desired shape. If the variation of pressure versus axial feeding is not determined properly, the workpiece may be buckled, wrinkled or burst during THP. The appropriate variation is normally determinedby experiment which is expensive and time-consuming. In this work, numerical simulation using Johnson-Cook models for predicting the elasto-plastic response and the failure of the material are employed to obtain the best combination of internal pressure and axial feeding. The numerical simulations are examined by a number of experiments conducted in the present investigation. The results show very close agreement between the numerical simulations and the experiments, suggesting that the numerical simulationsusing Johnson-Cook material and failure models provide a valuable tool to examine the different parameters involved in THP.

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“…No experiment verification was conducted [7]. According to the authors' viewpoint, not all wrinkles are defects and the part can be successfully formed by the useful wrinkles [8,9]. However, the reason * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%