Multi-dome forming test for determining the strain rate sensitivity index of a superplastic 7075Al alloy sheet

Kumaresan, G.; Kalaichelvan, K.

doi:10.1016/j.jallcom.2013.08.194

Cited by 21 publications

(10 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The true stress-strain values obtained from the compression tests were used to calculate the strain rate sensitivity (m). To determine this parameter, several methods can be used, such as determining the slope of the log (𝜎)-log (𝜀) from instantaneous values, changing the deformation rate, or by performing stress-relaxation tests [11][12][13][34][35][36][37][38].…”

Section: Strain Rate Sensitivitymentioning

confidence: 99%

The effect of microstructure and strain rate on the 25 °C and 700 °C compression deformation behavior of powder metallurgy processed Ti-45Al-2Nb-2Mn (at.%)-0.8 TiB2 (vol%) alloy

Boehlert

Hernández-Escobar

Ruiz-Palenzuela

et al. 2021

Materials Characterization

View full text Add to dashboard Cite

Section: Strain Rate Sensitivitymentioning

confidence: 99%

The effect of microstructure and strain rate on the 25 °C and 700 °C compression deformation behavior of powder metallurgy processed Ti-45Al-2Nb-2Mn (at.%)-0.8 TiB2 (vol%) alloy

Boehlert

Hernández-Escobar

Ruiz-Palenzuela

et al. 2021

Materials Characterization

View full text Add to dashboard Cite

“…The main parameters to evaluate superplasticity include elongation to failure, strain-rate sensitivity index, deformation homogeneity and activation energy. [3][4][5] Among these parameters, elongation and strain-rate sensitivity index, m, are the most important. 4 In general, elongation shows a monotonic increase with an increasing m-value.…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5] Among these parameters, elongation and strain-rate sensitivity index, m, are the most important. 4 In general, elongation shows a monotonic increase with an increasing m-value. [6][7][8][9][10] However, several papers [11][12][13] concerned with superplastic materials reported that the peak ductility does not necessarily occur at maximum m. G. Rai and N. J.…”

Section: Introductionmentioning

confidence: 99%

Study on the evaluation method for superplasticity of duplex stainless steel

Jia¹,

Ren²,

Zhang³

2020

Mater. Tehnol.

View full text Add to dashboard Cite

Aiming at the problem of long duration of superplastic tensile tests for materials with a large elongation, a new method for evaluating the superplastic properties of duplex stainless steel (DSS) is proposed. In this paper, relative values of stress difference D and stress variation factor f are introduced to predict the elongation, d. Elongation can be predicted with the relational expression between D and d as long as the specimen is stretched only by 500 % during the superplastic uniaxial tensile test. Factors affecting elongation include the thermo-mechanical treatment and superplastic-deformation conditions. For DSS2205, the change trend of f and influencing factors is similar to that of elongation and influencing factors.

show abstract

“…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%

“…These results were applied for computer simulation of rectangular box forming [ 17 ] to confirm the efficiency of a multi-dome test. Later multi-dome forming tests were used to examine the strain rate sensitivity index of a 7075 Al alloy [ 16 ]. In this study, the forming mold has five holes of different diameters: 1, 2, 5, 10 and 15 mm.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

View full text Add to dashboard Cite

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.

show abstract

Multi-dome forming test for determining the strain rate sensitivity index of a superplastic 7075Al alloy sheet

Cited by 21 publications

References 18 publications

The effect of microstructure and strain rate on the 25 °C and 700 °C compression deformation behavior of powder metallurgy processed Ti-45Al-2Nb-2Mn (at.%)-0.8 TiB2 (vol%) alloy

The effect of microstructure and strain rate on the 25 °C and 700 °C compression deformation behavior of powder metallurgy processed Ti-45Al-2Nb-2Mn (at.%)-0.8 TiB2 (vol%) alloy

Study on the evaluation method for superplasticity of duplex stainless steel

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

Contact Info

Product

Resources

About