A New Proposal for a Method to Measure Orthogonal R-Value Using a Single Tensile Test with Three-Dimensional Digital Image Correlation

Gu, Gang Hee; Kim, Y.; Kwon, Hyuk-Sung; Ahn, Soung Yeoul; Seo, Min Hong; Ahn, Kun-Hyuck; Kim, Hyoung Seop

doi:10.1007/s11340-022-00857-3

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…efforts than usual tensile tests. Even more complex experimental setups, using double video acquisition, are those implementing 3D Digital Imaging used to study anisotropic materials as in [23,26,27]. Zhang et al [28] analyzed the relationship between area and thickness reduction during a tensile test, observing that the total the ratio ΔA/A0 can be decomposed into a proportional term and a non-linear term depending on the ratio Δt/t0.…”

Section: Four Approaches To the Stress And Strain Derivation In Flat ...mentioning

confidence: 99%

“…In such cases, simultaneous video acquisitions from two orthogonal viewpoints have been successfully adopted in [25] for deriving the post-necking true curves, but this procedure requires more experimental efforts than usual tensile tests. Even more complex experimental setups, using double video acquisition, are those implementing 3D Digital Imaging used to study anisotropic materials as in [23,26,27]. Zhang et al [28] analyzed the relationship between area and thickness reduction during a tensile test, observing that the total the ratio ∆A/A 0 can be decomposed into a proportional term and a non-linear term depending on the ratio ∆t/t 0 .…”

Section: Introductionmentioning

confidence: 99%

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A Simple Procedure for the Post-Necking Stress-Strain Curves of Anisotropic Sheet Metals

Mirone,

Barbagallo,

Bua

et al. 2023

Metals

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Modelling the anisotropic plasticity of a metal requires the derivation of various experimental flow curves from specimens machined along different orientations and, depending on the anisotropy model, tested under different loading modes (tension, compression, torsion). The derivation of stress–strain curves from tensile experiments is a common practice within the uniform straining range but still presents some uncertainties after necking onset. Modern sheet metals, for structural applications where significant energy absorption is required, may exhibit early necking and prolonged post-necking ductility; when such alloys also exhibit pronounced anisotropy, the derivation of their flow curves may be challenging, whatever the loading mode or the specimen direction. This work examines the experimental procedures for determining the true-stress–true-strain curve and the anisotropic strain ratio, extended over the post-necking range and up to failure, from representative tensile tests along the rolling direction of PHS-1800 steel and aluminum 6181 alloy. The validity ranges of different standard procedures for stress–strain derivation are investigated to understand when and how fast the typical true-stress–true-strain data start to depart from the effective material response. Other considerations, based on simple experimental and post-processing procedures, aim at a procedure delivering useful information about the material response over the post-necking range and up to failure. The procedure to retrieve post-necking true curves and anisotropy ratios is then applied to tensile tests at static, intermediate, and high strain rates on the two sheet metals of interest.

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Section: Four Approaches To the Stress And Strain Derivation In Flat ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Simple Procedure for the Post-Necking Stress-Strain Curves of Anisotropic Sheet Metals

Mirone,

Barbagallo,

Bua

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…However, this is not the case for anisotropic materials, making it more difficult to evaluate the actual cross-sectional area [16,18]. Consequently, complex experimental setups such as 3D Digital Image Correlation (DIC) have been proposed to directly reconstruct the full 3D geometry of the specimen [19,20].…”

Section: Introductionmentioning

confidence: 99%

True stress-strain identification accounting for anisotropy of sheet metals

Mirone,

Barbagallo,

Bua

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Sheet metals for the automotive industry are subjected to continuous research efforts aiming at ever increasing mechanical performance. A remarkable feature of modern high strength sheet metals is their anisotropy, intrinsic in the technologic process of their production. When the effect of anisotropy on the mechanical response of a material cannot be neglected, specimens along different directions are usually tested, possibly under different stress states, to assess the flow curves and the deforming ratios for each direction and each loading mode. Such data are then used to calibrate many possible plastic anisotropy models available in the literature. In this work, the experimental procedures for determining the stress-strain curve and the anisotropic straining ratio are studied in detail, referring to representative tensile tests along the rolling direction of two anisotropic sheet metals, respectively PHS-1800 steel and 6181 aluminium alloy. Both alloys are ductile and exhibit remarkably long post-necking phases in tension, revealing that, in such cases, the standard procedures for the experimental derivation of the hardening curves and of the anisotropic strain ratios are limited to the very early phases of the material life and miss to cover the major part of the strain range up to failure. Different alternative procedures for the derivation of experimental data and for their postprocessing are considered and compared to each other, identifying a set of guidelines for achieving a good engineering accuracy up to failure in deriving both the stress-strain curves and the anisotropic strains ratios. The above analyses are made on the results of tensile tests at static, intermediate and high strain rate, confirming the generality of the identified procedure.

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A Method for Measuring Plastic Strain Ratio Over a Wide Strain Range Using the Digital Image Correlation Technology

Kim

Seo

et al. 2022

Met. Mater. Int.

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A New Proposal for a Method to Measure Orthogonal R-Value Using a Single Tensile Test with Three-Dimensional Digital Image Correlation

Cited by 3 publications

References 28 publications

A Simple Procedure for the Post-Necking Stress-Strain Curves of Anisotropic Sheet Metals

A Simple Procedure for the Post-Necking Stress-Strain Curves of Anisotropic Sheet Metals

True stress-strain identification accounting for anisotropy of sheet metals

A Method for Measuring Plastic Strain Ratio Over a Wide Strain Range Using the Digital Image Correlation Technology

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