Design and experimental validation of a two-stage superplastic forming die

Luckey, George; Friedman, Peter A.; Weinmann, K. J.

doi:10.1016/j.jmatprotec.2008.05.019

Cited by 52 publications

(31 citation statements)

References 4 publications

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“…The values for the material constants K, m, and n, considered in this study, are 159.5, 0.39 and 0.088, respectively. These values are retrieved from (Luckey Jr., Friedman, & Weinmann, 2009) …”

Section: Materials Constitutive Modelmentioning

confidence: 99%

Design for Manufacturing of an Aluminum Superplastic AA5083 Alloy Plate-Fin Heat Exchanger

Juneidi¹,

Asha²,

Jarrar³

et al. 2016

JMSR

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Compact, lightweight, strong, and corrosion-resistant heat exchangers are required for many applications. In heat exchangers, plate-fin exchangers design with corrugated fins of triangular cross-sections provide high heat transfer surface area to volume ratio. This study focuses on the design for manufacturing of an aluminum AA5083 alloy plate-fin heat exchanger. The superplastic forming method is considered for the fabrication of the heat exchanger. A two-dimensional plane strain finite element model is used to study the effect of the triangular fins' aspect ratio on the thickness distribution and the required gas forming pressure cycles. The simulation results show that the thinning in deep channels can be improved by increasing the coefficient of friction but only up to a certain limit. In addition, increasing the coefficient of friction reduces the required applied pressure on the sheet and increases the forming time. The present effort represents a necessary step toward the design of sophisticated corrugated triangular fin surfaces considering both performance and manufacturability.

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Section: Materials Constitutive Modelmentioning

confidence: 99%

Design for Manufacturing of an Aluminum Superplastic AA5083 Alloy Plate-Fin Heat Exchanger

Juneidi¹,

Asha²,

Jarrar³

et al. 2016

JMSR

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“…For three-stage superplastic forming, pressure was varied from 0.1 MPa to 0.8 MPa and for each pressure, superplastic forming experiments were conducted at (5,8,9,10,12,15,18,20,25,27,29 and 30) mm of bulge height to predict the optimum pressure required for uniform thickness distribution. For each bulge height, individual components were formed and the parameters of pole thickness, thickness distribution, relative bulge height, relative bulge radius, forming time, average thickness and thinning factor were determined.…”

Section: Fig 1 Schematic Arrangement Of Three Stage Diementioning

confidence: 99%

“…For example, Jovane [8] has determined superplastic forming parameters, such as k and m, by varying the applied pressure in increments and thus optimized the pressure at which change in strain rate becomes insignificant. Luckey et al [9] have developed a two-stage complex dome employing a superplastic forming process in order to improve the thickness profile and prevent wrinkling effects in AA 5083 alloy sheets. Ragab [10] has examined sticking between the contact surface of the sheet and die in the single-stage forming of a cylindrical cup and further investigated thickness distribution under plane-strain conditions.…”

Section: Introductionmentioning

confidence: 99%

Superplastic Forming of a Three-Stage Hemispherical 5083 Aluminium Profile

Balasubramanian

Ganesh

Ramanathan

et al. 2015

SV-JME

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“…Luo et al presented a novel SPF process utilizing a mechanical preforming operation of SPF5083 alloy and verified that this process could deliver a superior thickness profile as compared to conventional SPF [7]. Based on the two-stage SPF process, Luckey Jr. et al designed a preform die to improve the thickness profile of SPF5083 alloy parts [8]. Luo et al also compared two-stage gas forming (TSGF) and hot draw mechanical preforming (HDMP) to conventional SPF when forming a SPF5083 alloy part and found that HDMP could provide a superior thickness profile and faster forming cycle than the other two processes [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of flow stress behaviour, pressure loading path and temperature variation on high-pressure pneumatic forming of Ti-3Al-2.5V tubes

Liu

Wang

Dang

et al. 2015

Int J Adv Manuf Technol

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High-pressure pneumatic forming (HPPF) is an internal high-pressure forming process at elevated temperatures, which is based on quick plastic forming (QPF), hot metal gas forming (HMGF) and hydroforming. In this study, the HPPF experiments were performed on Ti-3Al-2.5V tubes using a square cross-sectional die at higher pressure levels and lower temperatures. The uniaxial tensile tests were carried out at various temperatures and strain rates before the HPPF experiments. The flow stress of Ti-3Al-2.5V tubes is evidently affected by both temperature and strain rate. Because of this, the corner radii all change linearly over time at the pressurization stage but exponentially over time at the constant pressure stage. The cooling effect of the inflow process on the tubes results in temperature differences between the centre of the straight wall areas and the corner areas of the tubes during the inflow process. Adopting the lower pressurization rate and filling regenerative materials into the tube are effective methods for decreasing or eliminating the temperature difference.

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Design and experimental validation of a two-stage superplastic forming die

Cited by 52 publications

References 4 publications

Design for Manufacturing of an Aluminum Superplastic AA5083 Alloy Plate-Fin Heat Exchanger

Design for Manufacturing of an Aluminum Superplastic AA5083 Alloy Plate-Fin Heat Exchanger

Superplastic Forming of a Three-Stage Hemispherical 5083 Aluminium Profile

Effects of flow stress behaviour, pressure loading path and temperature variation on high-pressure pneumatic forming of Ti-3Al-2.5V tubes

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