Double-sided high-pressure tubular hydroforming

Smith, L. M.; Ganeshmurthy, Saravanan; Alladi, K

doi:10.1016/s0924-0136(02)01041-5

Cited by 30 publications

(13 citation statements)

References 4 publications

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“…Wu et al (2009) applied a classical phenomenological plasticity model, which uses Jaumann rate with respect to the continue spin tensor w . It is also noted that Smith et al (2003) and Allwood and Shouler (2009) discussed the effect of normal stress (perpendicular to the sheet plane) on FLDs.…”

Section:  Onmentioning

confidence: 99%

Numerical study of the effects of shear deformation and superimposed hydrostatic pressure on the formability of AZ31B sheet at room temperature

Wang

Lee

et al. 2015

International Journal of Mechanical Sciences

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The effect of the shear deformation and the superimposed hydrostatic pressure on the formability of magnesium alloy sheet is simulated in terms of the forming limit diagram (FLD). The model employed is the elastic viscoplastic selfconsistent (EVPSC) crystal plasticity model, which accounts for both slip and twinning systems as the deformation mechanisms. The conventional sheets have low formability at room temperature due to the strong basal texture developed by the rolling process. However differential speed rolling process develops relatively weak basal texture by introducing shear deformation. Therefore the formability of the sheets produced by differential speed rolling is enhanced. In terms of the superimposed hydrostatic pressure, it delays the onset of necking and therefore improves the formability of sheets. In addition, the effect of crystal elasticity on the formability of sheets is numerically studied.

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Section:  Onmentioning

confidence: 99%

Numerical study of the effects of shear deformation and superimposed hydrostatic pressure on the formability of AZ31B sheet at room temperature

Wang

Lee

et al. 2015

International Journal of Mechanical Sciences

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“…Therefore, several researchers proposed an interesting concept of double-sided hydroforming, because they considered that synchronous introduction of liquid pressure on double sides of the sheet or tube could overcome the problem of their poor formability due to the change in their stress state. 2–4…”

Section: Introductionmentioning

confidence: 99%

Further assessment of the plastic instability of thin-walled tubes in double-sided hydro-bulging process with verification experiments

Cui

Wang

Shi

2017

Proceedings of the Institution of Mechanical Engineers, Part B:

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An interesting process of double-sided tube hydro-bulging was proposed to provide a beneficial three-dimensional stress state in the deformation zone of the tube, so as to delay the occurrence of bursting on the tube. Previously proposed forming limit theory models with consideration of through-thickness normal stress found that the external pressure could lead to a deferred occurrence of plastic instability, but it has not been confirmed experimentally. In this article, the tensile plastic instability of tubes under double-sided pressures is further assessed based on the classical plastic instability theory. However, it is seen that the occurrence of plastic instability has not found delay when high external pressure was exerted on the outside surface of tube simultaneously, which is opposite to the previous forming limit models. In addition, an experiment investigation about double-sided tube hydro-bulging is conducted to verify the theoretical results, and the experimental results show that the external pressure has hardly any influence on forming limit strain of the 2A12 aluminum alloy tube before the occurrence of necking. Moreover, the contradiction between our results and the previously proposed forming limit theory models is that the previous models ignored the thickness item in the equilibrium equation.

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“…However, the concept of double-sided hydroforming was proposed by several researchers who believed that introduction of hydraulic pressure acting on both sides of the tube or sheet simultaneously could change the stress state so as to improve their formability [19][20][21]. As early as 1966, Fuchs [19] found that the forming limit of tube can be improved remarkably by applying pressure on both sides of the tube simultaneously in their experimental study.…”

Section: Introductionmentioning

confidence: 99%

Determination of mechanical properties of anisotropic thin-walled tubes under three-dimensional stress state

Cui

Yuan

2016

Int J Adv Manuf Technol

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Tube hydro-bulging test is a specialized method to obtain the mechanical properties of tubes when they are deformed under bi-axial stress states. However, the normal stress cannot be ignored in double-sided tube hydroforming process. In order to investigate the mechanical properties of anisotropic thin-walled tubes under three-dimensional stress state, an analytical model for stress component calculation for fixed-end tube under internal and external pressures was proposed. Furthermore, the equivalent stress and the equivalent strain were derived using the Hill 1948 yield criterion through plastic increment theory. A thin-walled AA5052-O aluminum alloy tubes were bulged under different external pressures using a dedicated testing apparatus for double-sided tube hydrobulging tests. Then, hardening curves considering anisotropy were obtained for each external pressure condition, respectively. It is shown that the strain hardening exponent of AA5052 tube shows a slight increase with the increasing external pressure, and the external pressure of 85 MPa has little or no effects on the hardening behavior of tubes. Moreover, the anisotropy has a little effect on the strain hardening exponent, but has an obvious influence on the strength coefficient of the AA5052 tube. Therefore, for the measurement of the AA5052 tube's mechanical properties under three-dimensional stress state, the effect of external pressure can be ignored but the anisotropy of tubes must be considered.

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Double-sided high-pressure tubular hydroforming

Cited by 30 publications

References 4 publications

Numerical study of the effects of shear deformation and superimposed hydrostatic pressure on the formability of AZ31B sheet at room temperature

Numerical study of the effects of shear deformation and superimposed hydrostatic pressure on the formability of AZ31B sheet at room temperature

Further assessment of the plastic instability of thin-walled tubes in double-sided hydro-bulging process with verification experiments

Determination of mechanical properties of anisotropic thin-walled tubes under three-dimensional stress state

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