Superplastic Characteristics of Ti-Alloy and Al-Alloy Sheets by Multi-Dome Forming Test

El-Morsy, Abdel-Wahab; Akkuş, Nihat; Manabe, Ken‐ichi; Nishimura, Haruhiko

doi:10.2320/matertrans.42.2332

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…The coefficients of Equation (1) are calculated by the approximation of the measured flow stress values for different strain rates. However, in some investigations [ 3 , 6 , 7 , 8 , 9 ] it was shown that free bulging testing is a more suitable experimental technique for characterization of a material formed in biaxial tension conditions. The comparison of material characteristics obtained by free bulging and tensile tests for aluminum based alloys is presented in [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…The comparison of material characteristics obtained by free bulging and tensile tests for aluminum based alloys is presented in [ 6 , 7 , 8 , 9 ]. Similar investigations for titanium based alloys are presented in [ 8 ]. There are several technics to obtain the material constants based on the results of free bulging tests [ 10 , 11 , 12 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

“…The amount of information produced by single test can be increased by using specific equipment for real-time measurement of the dome height evolution and application of special forming regimes with stepped pressure changes [ 12 , 13 ]. Another way to increase the informability of a test is to form several domes at once [ 8 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of OT4-1 Alloy by Multi-Dome Forming Test

et al. 2017

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In this study, the rheological characteristics of a titanium alloy have been obtained by multi-dome bulging test. Free bulging process is an experimental technique that can be used to characterize material in conditions of biaxial tension during superplastic, as well as conventional, hot forming. The constitutive constants are calculated on a base of the information about the bulge geometry, applied pressure, and forming time. A multi-dome forming test allows one to reduce the number of the experiments required for the characterization, since every multi-dome test produces several domes of different size. In this study, a specific die for multi-dome test was used. The die has six holes with different radiuses of 20, 25, 30, 35, 40, and 45 mm. During a test, the specimen is clamped between blank holder and die holder, heated to a specific temperature, and formed by applying constant gas pressure. The experiments were conducted at different temperatures for OT4-1 titanium alloy. The constitutive constants were obtained by processing the experimental data using two different techniques and compared with tensile test results. In order to estimate the influence of friction on the experimental results and to verify obtained material characteristics, finite element (FE) simulation was performed. Finally, the results of FE simulation were compared with the experimental data. The results of the simulation show the advantage of material characterization based on multi dome tests and its interpretation by inverse analysis. The deviations produced by the effect of friction are more significant when the direct approach is applied instead of inverse analysis with a semi analytical model of the bulging process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization of OT4-1 Alloy by Multi-Dome Forming Test

et al. 2017

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“…5, which has a strong influence on the estimation of the bulge time. 12,19,20) The accuracy of the estimated bulge time is decreased with a decreasing m value. The error in the estimated bulge time for the material characteristics at 673 K is less than 10%, whereas the error in the estimated bulge time in the case of 703 K is more than 60%.…”

Section: Simulation Of Rectangular Pan Formingmentioning

confidence: 99%

“…12,13) In this testing method, SP material characteristics were determined by the following equations:…”

Section: Materials Testingmentioning

confidence: 99%

Superplastic Forming of AZ31 Magnesium Alloy Sheet into a Rectangular Pan

2002

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Superplastic behaviour of Mg-alloy AZ31 was investigated to clarify the possibility of its use for superplastic forming (SPF) and to accurately evaluate material characteristics under a biaxial stress by utilizing a multi-dome test. The material characteristics were evaluated under three different superplastic temperatures, 643, 673, and 703 K in order to determine the most suitable superplastic temperature. Finite Element Method (FEM) simulation of rectangular pan forming was carried out to predict the formability of the material into a complex shape. The superplastic material properties are used for the simulation of a rectangular pan. Finally, the simulation results are compared with the experimental results to determine the accuracy of the superplastic material characteristics. The experimental results revealed that the m values are greater than 0.3 under the three superplastic temperatures, which is indicative of superplasticity. The optimum superplastic temperature is 673 K, at which a maximum m value and no grain growth were observed. The results of the FEM simulation revealed that certain localized thinning occurred at the die entrance of the deformed rectangular pan due to the insufficient ductility of the material. The simulation results also showed that the optimum superplastic temperature of AZ31 is 673 K.

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Determination of biaxial stress–strain curves for superplastic materials by means of bulge forming tests at constant stress

Aksenov

Sorgente

2020

CIRP Journal of Manufacturing Science and Technology

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Superplastic Characteristics of Ti-Alloy and Al-Alloy Sheets by Multi-Dome Forming Test

Cited by 14 publications

References 5 publications

Characterization of OT4-1 Alloy by Multi-Dome Forming Test

Characterization of OT4-1 Alloy by Multi-Dome Forming Test

Superplastic Forming of AZ31 Magnesium Alloy Sheet into a Rectangular Pan

Determination of biaxial stress–strain curves for superplastic materials by means of bulge forming tests at constant stress

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