Cavitation during Multiaxial Deformation of Superplastic Forming

Khaleel, Mohammad A.; Smith, Mark T.; Lund, A.L.

doi:10.4028/www.scientific.net/msf.243-245.155

Cited by 7 publications

(3 citation statements)

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“…Note that the values of d 0 , c, f a0 , n and w were chosen based on the literature since no experimental data on the microstructural evolution in the material were available (Ref [23][24][25][26]. Figure 2 shows a plot of the material model against the experimental data in Fig.…”

Section: Constitutive Equationsmentioning

confidence: 99%

Simulation of High-Temperature AA5083 Bulge Forming with a Hardening/Softening Material Model

Jarrar

Abu-Farha

Hector

et al. 2009

J. of Materi Eng and Perform

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High-temperature bulge forming of AA5083 aluminum sheet was simulated with the commercial finite element (FE) code ABAQUSä. A material model that is strain rate sensitive and accounts for strain hardening and softening was used. Results were compared with data from AA5083 bulge forming experiments at 450°C where the gas pressure was a prescribed constant value. The results show that the material model is capable of predicting the deformation and thinning behavior at different constant pressure levels. In ancillary simulations, time-varying pressure profiles were computed (rather than prescribed) with an internal ABAQUSä routine that attempts to maintain the strain rate at the bulge dome pole within a specified range. The time-varying profiles, for which no experimental AA5083 bulge forming data exist, can be programmed into existing bulge testing instrumentation to validate the associated predictions of bulge dome height and thinning. The present effort represents a necessary step toward predicting gas pressure profiles by coupling the pressure profile with a desired sheet deformation rate.

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Section: Constitutive Equationsmentioning

confidence: 99%

Simulation of High-Temperature AA5083 Bulge Forming with a Hardening/Softening Material Model

Jarrar

Abu-Farha

Hector

et al. 2009

J. of Materi Eng and Perform

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“…Zelin et al (1997) explored the cavity distribution in the formed double-well pans. Khaleel et al (1997) demonstrated evolution of cavitation level during blowing forming. The metal flow and evolution of cavitation level have less been examined.…”

Section: Introductionmentioning

confidence: 97%

Deformation characteristics and cavitation during multiaxial blow forming in superplastic 8090 alloy

Hwang

Chiu

2009

Journal of Materials Processing Technology

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“…Aluminum alloy 5083 SPF is a perspective candidate for nonstructural parts due to its low weight, good corrosion resistance, formability and adequate post-SPF strength. The recent introduction of this alloy has attracted considerable interest [1][2][3][4][5][6][7][8]. One of the issues considered is the need to apply backpressure to suppress the formation of internal voids at high deformations.…”

Section: Introductionmentioning

confidence: 99%

Problems Encountered in Superplastic Forming of Al 5083 Parts

Gershon¹,

Eldror²,

Arbel³

et al. 2004

MSF

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The low-price superplastic, non-heat-treatable Al-Mg-Mn alloy 5083 has already been applied in the automotive industry, but not yet on aircrafts. Conformance with the stringent requirements for aircraft parts requires extensive R&D towards optimization of the superplastic forming (SPF) parameters and establishment of the post SPF properties. In this paper we report of an investigation carried out on SPF of 5083, in a temperature range of 480-530 0 C, at a strain rate of ~0.001 sec -1 , to a maximum surface deformation of 100-300%, with or without applied backpressure. It was established that: •Post -forming Tensile Yield and Ultimate Tensile Strength (YS and UTS) are independent of the deformation up to 300% and of void content up to 2%. •Void size and volume increase rapidly at surface deformation over 100%, resulting in forming-tears due to local coalescence of voids on grain boundaries and in roughening of the "free" (non-contacting) surface. •Voiding can be depressed and surface roughness improved by application of backpressure. The minimum backpressure for inhibition of voids depends on surface deformation, typically 2.5 MPa for 300%. The results of this R&D were exploited in design and manufacture of parts for new Israel Aircraft Industries produced aircrafts.

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Cavitation during Multiaxial Deformation of Superplastic Forming

Cited by 7 publications

References 0 publications

Simulation of High-Temperature AA5083 Bulge Forming with a Hardening/Softening Material Model

Simulation of High-Temperature AA5083 Bulge Forming with a Hardening/Softening Material Model

Deformation characteristics and cavitation during multiaxial blow forming in superplastic 8090 alloy

Problems Encountered in Superplastic Forming of Al 5083 Parts

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