A new method for determining limit strains of materials that show post-uniform elongation behavior

Türköz, Mevlüt; Halkacı, Hüseyin Selçuk; Yiğit, Osman; Dilmeç, Murat; Öztürk, Fahrettin

doi:10.1177/0954405413501812

Cited by 6 publications

(5 citation statements)

References 11 publications

(11 reference statements)

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“…10 Nakajima testing is well established for the determination of forming limit curves for various materials including copper and steel. 11,12 Samples with different geometries were prepared to give varied strain paths. DIC was used to analyze the samples during deformation and establish the peak strains observed within the test piece immediately prior to failure.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Formability and Microstructural Evolution of C106 Copper and 316L Stainless Steel

Taylor

Masters

et al. 2019

JOM

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Strain-hardenable materials achieve their strength due to the build-up of defects and dislocation tangles within the microstructure brought about by strain induced through processing or forming. This strength can be significantly reduced and negatively impacted if the material is used in service at elevated temperatures, which causes the grain structure to recover and recrystallize to a more organized, lower strength state. Forming limit curves of C106 DHP copper and 316L stainless steel were established using an Interlaken hydraulic press with Nakajima punch tooling and GOM digital image correlation cameras. These formed samples were used as an analog to current formed parts, and the effect of extant elevated operating temperatures was then investigated by means of microhardness testing. High-resolution electron backscatter diffraction (EBSD) analysis using a JEOL JSM-7800F fieldemission gun scanning electron microscope was employed to understand the various mechanisms responsible for the physical and microstructural changes during forming and at elevated temperatures.

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Section: Introductionmentioning

confidence: 99%

Comparison of Formability and Microstructural Evolution of C106 Copper and 316L Stainless Steel

Taylor

Masters

et al. 2019

JOM

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“…Two primary test methods, in-plane [4][5][6] and out-ofplane [7][8][9][10][11] formability experiments, are widely adopted to find out the FLDs for sheet metals under different forming situations, including deformation rate and temperature. 12 Various researchers 13,14 have also adopted planar biaxial tensile experiments to determine FLDs for sheet metals, since effect of friction is absent and precise control of strain path is possible.…”

Section: Introductionmentioning

confidence: 99%

Effect of specimen orientation to the rolling direction on uniaxial tensile forming and failure limits

Ghosal

Paul

2020

Proceedings of the Institution of Mechanical Engineers, Part B:

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Alteration of forming and failure limits due to planar anisotropy of the sheet metal significantly affects the safe forming operation region and finally successfully manufacturing of a sheet metal formed component. This article presents the effect of planar anisotropy on uniaxial tensile properties, forming and failure limits of cold-rolled ferritic and dual-phase steels. In-situ three dimensional digital image correlation technique is used to measure the evolution of local strain components during uniaxial tensile test. For both the steels, necking limit is highest for the specimen at an orientation of 90° to rolling direction, while failure limit is highest for those specimen whose orientation is 45° to rolling direction for ferritic steel, and both 0° and 90° to rolling direction for dual-phase steel. Uniaxial tensile deformation path for ferritic steel holds lower slope than dual-phase steel as depicted in major versus minor strain plot.

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“…Researchers determine the left side of the FLC from uniaxial tensile and notch tensile tests by local strain measurement on different sheet metals. [1][2][3][4][5][6] However, determination of HER from normal uniaxial tensile test is not possible due to the fundamental difference of deformation process. 7,8 HER is widely used as a limiting criterion during edge stretching operation of sheet metals.…”

Section: Introductionmentioning

confidence: 99%

Effect of punch geometry on hole expansion ratio

Paul

2019

Proceedings of the Institution of Mechanical Engineers, Part B:

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Stretch-flangeability of sheet metal is normally quantified by hole expansion ratio. Researchers have determined hole expansion ratio with various punch geometries such as conical, flat-bottom and hemispherical, and reported different hole expansion ratio values for identical test condition. Finite element investigation confirms that alteration of deformation path with punch geometries consequence different hole expansion ratio values. Necking and failure take place slightly away from the central hole edge for flat-bottom and hemispherical punches, while at the central hole edge for conical punch. Approximately plane strain tensile deformation prevails at the failure location for flat-bottom and hemispherical punches, while pure uniaxial tensile deformation prevails for conical punch.

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A new method for determining limit strains of materials that show post-uniform elongation behavior

Cited by 6 publications

References 11 publications

Comparison of Formability and Microstructural Evolution of C106 Copper and 316L Stainless Steel

Comparison of Formability and Microstructural Evolution of C106 Copper and 316L Stainless Steel

Effect of specimen orientation to the rolling direction on uniaxial tensile forming and failure limits

Effect of punch geometry on hole expansion ratio

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