Analysis of shape variation during hydro-forming of ellipsoidal shells with double generating lines

Shi, Yuan; Zhang, W.W.

doi:10.1016/j.ijmecsci.2016.01.007

Cited by 11 publications

(9 citation statements)

References 6 publications

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“…The assumption has been successfully applied to hydrobulge spheres [15][16][17][18][19][20][21][22], toroids [23][24][25][26][27][28], ellipsoids [29][30][31][32][33][34], and eggs [35][36][37]. The external surfaces of the perfect prolate ellipsoid and assumed ellipsoidal preform are mathematically described in Eq.…”

Section: Geometric Definition and Analytical Formulationmentioning

confidence: 99%

“…Integral hydrobulging is a method of fabricating large shells of revolution that is effective, flexible, and inexpensive compared with traditional die forming [11][12][13][14]. Large shells of revolution, such as spheres [15][16][17][18][19][20][21][22], toroids [23][24][25][26][27][28], ellipsoids [29][30][31][32][33][34], and eggs [35][36][37], can be directly hydrobulged from polyhedral preforms without the use of dies. The performance of these hydrobulged shells has been widely explored using analytical, numerical, and experimental methods.…”

Section: Introductionmentioning

confidence: 99%

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Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Zhang¹,

Tang²,

Zhan³

et al. 2022

Preprint

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The integrated hydrobulging of stainless-steel prolate ellipsoids from preforms with two thicknesses was investigated. The produced ellipsoids were closed with two 16-mm-thick closures and had nominal semiminor and semimajor axes of 89 and 125 mm, respectively. The ellipsoidal preforms comprised eight conical segments inscribed inside the target perfect ellipsoid. The four end and middle segments of the preforms had nominal thicknesses of 0.67 and 0.83 mm, respectively. The hydrobulging of these preforms was explored analytically and numerically and was compared with that of prolate ellipsoids with constant thickness. Two nominally identical ellipsoidal preforms were fabricated, measured, and hydrobulged to confirm the theoretical predictions. The results indicated that varying the preform thicknesses is an efficient method of overcoming insufficient hydrobulging of the ends of prolate ellipsoids in other methods. Moreover, hydrobulging instability can be effectively monitored by measuring geometric dimensions, such as axial height.

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Section: Geometric Definition and Analytical Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Zhang¹,

Tang²,

Zhan³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The wrinkling was successfully avoided by using a preform combined shell with double generating lines. The mathematical model between shell volume and axis length ratio was derived to control the shape of ellipsoidal shells during dieless hydroforming, as shown in figure 18 [47]. Based on the mathematical model (equation ( 1)), it can be seen that the volume variation depends on the initial axis length ratio (λ 1 , λ 2 ) of the pre-form polyhedron shell and the final axis length ratio (λ F ) of ellipsoidal shell.…”

Section: Novel Dieless Hydroforming Of Ellipsoidal Shells With Double...mentioning

confidence: 99%

mentioning

confidence: 99%

Developments and perspectives on the precision forming processes for ultra-large size integrated components

Yuan

Fan

2019

Int. J. Extrem. Manuf.

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In order to meet the requirements of high reliability, long-lifetime and lightweight in a new generation of aerospace, aviation, high-speed train, and energy power equipment, integrated components are urgently needed to replace traditional multi-piece, welded components. The applications of integrated components involve in a series of large-size, complex-shaped, high-performance components made of difficult-to-deform materials, which present a huge challenge for forming ultra-large size integrated components. In this paper, the developments and perspectives of several extreme forming technologies are reviewed, including the sheet hydroforming of ultra-large curved components, dieless hydroforming of ellipsoidal shells, radial-axial ring rolling of rings, in situ manufacturing process of flanges, and local isothermal forging of titanium alloy components. The principle and processes for controlling deformation are briefly illustrated. The forming of typical ultra-large size integrated components and industrial applications are introduced, such as the high strength aluminum alloy, 3 m in diameter, integrated tank dome first formed by using a sheet blank with a thickness the same as the final component, and a 16 m diameter, integrated steel ring rolled by using a single billet. The trends for extreme forming of ultra-large size integrated components are discussed with a goal of providing ideas and fundamental guidance for the further development of new forming processes for extreme-size integrated components in the future.

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Section: Introductionmentioning

confidence: 99%

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Zhang

Tang

Zhan

et al. 2023

Int J Adv Manuf Technol

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The integrated hydrobulging of stainless-steel prolate ellipsoids from preforms with two thicknesses was investigated. The produced ellipsoids were closed with two 16-mm-thick closures and had nominal semiminor and semimajor axes of 89 and 125 mm, respectively. The ellipsoidal preforms comprised eight conical segments inscribed inside the target perfect ellipsoid.The four end and middle segments of the preforms had nominal thicknesses of 0.67 and 0.83 mm, respectively. The hydrobulging of these preforms was explored analytically and numerically and was compared with that of prolate ellipsoids with constant thickness. Two nominally identical ellipsoidal preforms were fabricated, measured, and hydrobulged to confirm the theoretical predictions. The results indicated that varying the preform thicknesses is an efficient method of overcoming insufficient hydrobulging of the ends of prolate ellipsoids in other methods.Moreover, hydrobulging instability can be effectively monitored by measuring geometric dimensions, such as axial height.

show abstract

Analysis of shape variation during hydro-forming of ellipsoidal shells with double generating lines

Cited by 11 publications

References 6 publications

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

Developments and perspectives on the precision forming processes for ultra-large size integrated components

Integrated hydrobulging of prolate ellipsoids from preforms with multiple thicknesses

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