Effect of Strain Rate and Temperature Gradient on Warm Formability of Aluminum Alloy Sheet

Bagheriasl, Reza; Ghavam, Kamyar; Worswick, Michael J.

doi:10.1063/1.3623667

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Bagheriasl [20] used cartridge heater for heating up the die in Nakazima test in order to obtain the FLDs of AA3003 at temperature of 100-350°C and strain rate of 0.003-0.1 /s. The digital image correlation (DIC) technique [21] was adopted for strain measurement during the tests.…”

Section: Introductionmentioning

confidence: 99%

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Shao

Lin

et al. 2017

International Journal of Mechanical Sciences

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Published: Z. Shao, N. Li, J. Lin, T. Dean, 2017, Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model, Int. J. Mech. Sci., 120, pp149-158. AbstractHot stamping and cold die quenching has been developed in forming complex shaped structural components of metals. The aim of this study is the first attempt to develop unified viscoplastic damage constitutive equations to describe the thermo-mechanical response of the metal and to predict the formability of the metal for hot stamping applications. Effects of parameters in the damage evolution equation on the predicted forming limit curves were investigated. Test facilities and methods need to be established to obtain experimental formability data of metals in order to determine and verify constitutive equations. However, conventional experimental approaches used to determine forming limit diagrams (FLDs) of sheet metals under different linear strain paths are not applicable to hot stamping conditions due to the requirements of rapid heating and cooling processes prior to forming. A novel planar biaxial testing system was proposed before and was improved and used in this work for formability tests of aluminium alloy 6082 at various temperatures, strain rates and strain paths after heating, soaking and rapid cooling processes. The key dimensions and features of cruciform specimens adopted for the determination of forming limit under various strain paths were developed, optimised and verified based on the previous designs and the determined heating and cooling method [1]. The digital image correlation (DIC) system was adopted to record strain fields of a specimen throughout the deformation history. Material constants in constitutive equations were determined from the formability test results of AA6082 for the prediction of forming limit of alloys under hot stamping conditions. This research, for the first time, enabled forming limit data of an alloy to be generated at various temperatures, strain rates and strain paths and forming limits to be predicted under hot stamping conditions.

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Section: Introductionmentioning

confidence: 99%

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Shao

Lin

et al. 2017

International Journal of Mechanical Sciences

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“…A constant friction coefficient of 0.04 is defined between the tools and the blank surface to model the lubricated condition in deep drawing. 37 In stretch forming, a combination of three layers of Teflon film with grease sandwiched in between is applied to mimic a very low friction condition and achieve failure at the pole. Since failure perfectly occurred at the pole, a low friction condition is assumed in the simulation by defining a negligibly small value coefficient of friction of 0.001.…”

Section: Numerical Analysismentioning

confidence: 99%

Numerical simulation of sheet metal forming of an Al-Mg alloy incorporating plane strain properties in the yield criterion

Prakash

Digavalli

Lenzen

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this work, numerical simulation of AA5083-O aluminum alloy sheets is carried out using Yld2000-2d yield criterion to predict thinning and variation of load with displacement in sheet metal forming. It has been found that the accuracy of predictions in numerical simulation depends on the coefficients and the stress exponent used in the yield criterion. Hydraulic bulge tests with circular and elliptical die cavities are performed to characterize the material in equi-biaxial and plane strain conditions. An improved stress exponent is determined by incorporating the material properties obtained in plane strain in the existing criterion. The improved stress exponent is validated by using it in the numerical simulations of cylindrical cup deep drawing and stretch forming at room temperature. The same exponent is also used in the numerical simulations carried out for the case of experiments conducted at 250°C. The predicted thinning and load-displacement variations from the numerical simulations are validated with the experimental measurements. A considerable improvement in the results predicted using the improved stress exponent is observed at both the temperatures.

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Formability improvement with independent die and punch temperature control

2012

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Effect of Strain Rate and Temperature Gradient on Warm Formability of Aluminum Alloy Sheet

Cited by 3 publications

References 5 publications

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Formability evaluation for sheet metals under hot stamping conditions by a novel biaxial testing system and a new materials model

Numerical simulation of sheet metal forming of an Al-Mg alloy incorporating plane strain properties in the yield criterion

Formability improvement with independent die and punch temperature control

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