An investigation of springback stresses in AISI-1010 deep drawn cups

Gnaeupel-Herold, Thomas H.; Foecke, Timothy J.; Prask, H. J.; Fields, Richard J.

doi:10.1016/j.msea.2005.02.017

Cited by 26 publications

(16 citation statements)

References 7 publications

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“…The accumulated strain has direct impact on the throughthickness circumferential stress distribution. These stresses play a key role in the springback modelling because their integral over the thickness yields a nonzero bending moment and, thus, a change of shape [20,[32][33][34]47].…”

Section: Numerical Simulationmentioning

confidence: 99%

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Laurent

Coër

Grèze

et al. 2011

ISRN Mechanical Engineering

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This study deals with the mechanical behaviour and material modelling of an AA5754-O alloy at elevated temperature. Experimental shear tests were performed from room temperature up to 200• C, and the material behaviour has been identified with both shear and tensile tests, as a function of temperature. To analyse the influence of temperature during forming over springback, a split-ring test is used. Experimental results are obtained and compared to numerical simulations performed with the finite element in-house code DD3IMP. The numerical process of ring splitting is performed with the in-house code DD3TRIM. The main observed data are force-displacement curves of the punch during forming, cup thickness at the end of forming, and ring gap after splitting. It is shown that all these parameters are strongly dependent on the forming temperature. A correlation is obtained between experimental data and numerical simulation for the evolution of punch force and opening after springback as a function of temperature. The distribution of the tangential stress in the cup wall is the main factor influencing the springback mechanism in warm forming condition.

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Section: Numerical Simulationmentioning

confidence: 99%

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Laurent

Coër

Grèze

et al. 2011

ISRN Mechanical Engineering

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“…This stress has been investigated [9] and found to differ significantly from formalisms that model through thickness stresses for work hardening materials. [10] It was also found that there are variations in the hoop stress both around the circumference and in the vertical direction, both of which affect the springback opening.…”

Section: A Model Considerationsmentioning

confidence: 99%

“…[9] As the cup is drawn deeper, the fraction of uniform plastic strain in the cup wall increases. As a result, the material in all physical locations in the cup wall is deformed significantly past the yield stress, and the magnitude of the through-thickness strain inhomogeneities (difference in plastic strain from one location to another) introduced by the bending and unbending of the blank decreases.…”

Section: F Effect Of Error In Cup Heightmentioning

confidence: 99%

Robustness of the sheet metal springback cup test

Foecke

Gnaeupel-Herold

2006

Metall Mater Trans A

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The robustness of a proposed test for elastic springback characterization of sheet metal has been examined using a matrix of defined experimental errors. A series of flat bottom deep drawn cups made from AISI 1010 steel sheet were examined. It was found that misalignment of the blank over the forming tool and error in the vertical location where the springback ring was cut from the cup sidewall had the largest effect on the resulting springback opening. Other experimental errors involving cup height and ring width were found to be less important. The effect of in-plane anisotropy of mechanical properties on springback was negligible. The results are examined in terms of measured through thickness residual stresses and elastic bending of beams with circumferential thickness gradients.

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“…The effective XECs might be expected to change with accumulated plastic strain, because this will change the texture of the sample. [11,16,17] For uniaxial samples, this correction is easily determined using the method described previously while tracking the plastic strains using an extensometer. To determine the effect of biaxial plastic strain, additional samples prestrained in balanced biaxial tension to different plastic strain levels were subsequently tested in uniaxial tension under the X-ray system in the same manner as the unprestrained samples.…”

Section: Methodsmentioning

confidence: 99%

A Method for Direct Measurement of Multiaxial Stress-Strain Curves in Sheet Metal

Foecke

Iadicola

Lin

et al. 2007

Metall Mater Trans A

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A method has been developed that allows measurement of stress-strain curves for sheet metal being deformed in multiaxial tension. The strain state is imposed using a modification of the Marciniak in-plane biaxial stretching test. Resulting stresses are measured using a modified Xray diffraction (XRD) residual stress measurement system. This system is flexible enough to allow spatial mapping of in-plane stress and measurement of stresses at specific locations of interest on the sample, such as developing localizations. Results are presented correlating measurements on a thin strip of AA5182 with data from standard uniaxial tension test. Also presented are experimentally determined curves for this material in balanced biaxial tension in both the rolling and transverse directions.

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An investigation of springback stresses in AISI-1010 deep drawn cups

Cited by 26 publications

References 7 publications

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Mechanical Behaviour and Springback Study of an Aluminium Alloy in Warm Forming Conditions

Robustness of the sheet metal springback cup test

A Method for Direct Measurement of Multiaxial Stress-Strain Curves in Sheet Metal

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