Variation of strain rate sensitivity index of a superplastic aluminum alloy in different testing methods

Majidi, Omid; Jahazi, Mohammad; Bombardier, Nicolas; Samuel, E. Isaac

doi:10.1063/1.5007979

Cited by 8 publications

(8 citation statements)

References 11 publications

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“…(2009), reported that the m-values, determined based on the true stress, true strain curves and also using the jump-test method, varied from 0.35 to 0.70, which depended upon the forming conditions. Majidi, et. al.…”

Section: Resultsmentioning

confidence: 99%

Understanding Fiber-Matrix Integrity in Fiber-Reinforced Polymer Composites from Strain Rate Sensitivity Concept

Sinebe¹,

Chukwuneke²,

Omenyi³

2020

ujme

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Section: Resultsmentioning

confidence: 99%

Understanding Fiber-Matrix Integrity in Fiber-Reinforced Polymer Composites from Strain Rate Sensitivity Concept

Sinebe¹,

Chukwuneke²,

Omenyi³

2020

ujme

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“…The superplastic differential temperature tensile simulation of 5083Al was carried out to provide a basis for future industrial production. Majidi et al studied the m value of superplastic grades of aluminum alloys (AA5083) [ 6 ]. Patel et al believed that friction stir processing with the active cooling method can enhance the superplasticity of aluminum alloys [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation of Forming Process of Aluminum Alloy Rail Vehicle Side Window

Chen

et al. 2022

Materials

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With the vigorous development of rail transit trains around the world and the emergence of global environmental pollution and energy shortages, the world has an urgent need for manufacturing technology for lightweight aluminum alloy rail transit train components. This paper mainly studied the superplastic forming law of 5083Al for rail transit. Through the high-temperature tensile test and blowing forming experiments, the superplastic properties of 5083Al were determined. Based on this, the die design, finite element simulation, and forming experiment of the rail vehicle side window were carried out. In order to study the superplastic deformation behavior of industrial 5083Al under complex stress conditions, the influence of the depth, area ratio, and friction coefficient of the pre-forming die on the part thickness distribution is simulated. The side window is made of a high-strength 5083Al sheet in the form of bending at both ends to ensure the strength of the connection between the overall side window and the side wall skeleton. The variation law of the side wall forming height of 5083Al box-shaped parts was studied. The efficient manufacture of parts that meet quality standards was made possible by the optimization of the pressure profile. The microstructure changes of the material after superplastic forming were studied by Energy Dispersive Spectrometer (EDS) and Electron Backscattered Diffraction (EBSD).

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“…where σ, ε p , and ε p are the equivalent stress, plastic strain, and strain rate, respectively; K and n are the strain hardening parameters, while the parameter m represents the strain rate sensitivity index, and is commonly assumed to be a constant (average) number. In practice, however, it has been shown that m is not constant, but rather, is a function of the strain rate, plastic strain, and the test conditions (e.g., the applied test method, the temperature, and the geometry of the specimen) [17]. Specifically, when using the power law, the softening and damage of the superplastic material are not considered, and as a result, a wide range of viscoplastic models has been introduced [18][19][20][21][22] in order to better predict the flow behavior of superplastic metals.…”

Section: Introductionmentioning

confidence: 99%

Prediction of material behavior during biaxial stretching of superplastic 5083 aluminum alloy

Majidi

Jahazi

Bombardier³

2019

Int J Adv Manuf Technol

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In order to predict the flow behavior of a superplastic Al-Mg alloy sheet under near biaxial tension mode, finite element simulation was performed using commercial FE software (ABAQUS). To capture the time-dependent plastic behavior of the material, three constitutive models, i.e., the Voce model, a power law, and a newly introduced variable m value viscoplastic (VmV) model, were implemented in FE simulations. The models' parameters were assessed from the three uniaxial stress-strain curves ranging from 10 −3 to 10 −1 s −1 . To validate the simulation results, Nakazima hemispherical dome testing was performed under isothermal conditions using a constant strain rate of~0.01 s −1 at 450°C. After the tests, the thickness of the deformed parts was measured and the volume fractions of cavities at different locations were assessed using X-ray micro-tomography, and the impact of the strain path on the rate of cavitation was discussed. Based on the obtained results, when the material behavior was modeled using the VmV model, the accuracy of the prediction was about 2 and 5 times better than the ones from power law and Voce model, respectively. It was also observed that the volume fraction of the cavities exponentially increases with equivalent plastic strain and it depends on the strain path history.

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Variation of strain rate sensitivity index of a superplastic aluminum alloy in different testing methods

Cited by 8 publications

References 11 publications

Understanding Fiber-Matrix Integrity in Fiber-Reinforced Polymer Composites from Strain Rate Sensitivity Concept

Understanding Fiber-Matrix Integrity in Fiber-Reinforced Polymer Composites from Strain Rate Sensitivity Concept

Theoretical Investigation of Forming Process of Aluminum Alloy Rail Vehicle Side Window

Prediction of material behavior during biaxial stretching of superplastic 5083 aluminum alloy

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