Extracting plastic properties from in-plane displacement data of spherical indentation imprint

Hwang, Yewon; Marimuthu, Karuppasamy Pandian; Kim, Naksoo; Lee, Cheol-Soo; Lee, Hyungyil

doi:10.1016/j.ijmecsci.2021.106291

Cited by 33 publications

(4 citation statements)

References 49 publications

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“…This technique is a powerful tool for determining the mechanical properties of materials without requiring extensive material testing, as it relies on computational modeling to extract material properties from an indentation experiment. Kim et al [37] proposed a method for assessing the elastic limit and strain hardening exponent through a single spherical indentation test. This method relies on finite element (FE) analysis and regression analysis to associate indentation data with plastic properties, extracting plastic properties from the radial displacement field and the vertical profile of residual indentations.…”

Section: Introductionmentioning

confidence: 99%

Estimation of Mechanical Properties of Aluminum Alloy Based on Indentation Curve and Projection Area of Contact Zone

Bai,

Liu

2024

Metals

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This study proposes a method for determining aluminum alloys’ yield stress and hardening index based on indentation experiments and finite element simulations. Firstly, the dimensionless analysis of indentation variables was performed on three different aluminum alloys using the same maximum indentation depth to obtain load-displacement curves. Then, laser confocal microscopy was used to observe the residual indentation morphology. And four dimensionless parameters were derived from the load-displacement curves while another dimensionless parameter was obtained from the projection area of the contact zone. Subsequently, a genetic algorithm was employed to solve these five dimensionless parameters and estimate the yield stress and hardening index. Finally, the predicted results are compared with uniaxial tensile experiments and the results obtained are essentially the same. The yield stress and hardening index can be predicted using this method. And an example is used to verify that this method enables predictions for unidentified “mysterious material” and the expected results agree with the experiments.

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Section: Introductionmentioning

confidence: 99%

Estimation of Mechanical Properties of Aluminum Alloy Based on Indentation Curve and Projection Area of Contact Zone

Bai,

Liu

2024

Metals

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“…Much of this work is summarized in the literature. [6][7][8][9] Specific information about the PIP procedure is provided in several recent articles. [10][11][12][13][14][15] In particular, there is a review article [10] that covers the details of how the FE modelling is carried out, the sensitivities of outcomes to various parameters etc.…”

Section: Introductionmentioning

confidence: 99%

Profilometry‐Based Indentation Plastometry and Uniaxial Testing of Pipelines: Detection of In‐Plane Anisotropy and Potential for Simplification of Test Procedures

Vaka,

Warwick,

Clyne

2024

steel research int.

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This article concerns anisotropy in stress–strain relationships exhibited by steel pipelines. Since the stress from internal pressurization is highest in the hoop direction, standard industrial practice to measure these properties has focussed on tensile testing in this direction, requiring a prior flattening operation. The associated plastic deformation may affect properties, typically causing a (poorly‐defined) degree of hardening and the creation of inhomogeneity. Field testing of such pipelines, requiring in situ measurement of tensile properties (yield stress (YS) and ultimate tensile stress (UTS)), is based on indentation testing of the outer surface. One such test (profilometry‐based indentation plastometry (PIP)), not only gives the stress–strain curve, but also allows detection of any (in‐plane) anisotropy, with a high sensitivity. Both PIP testing and compression testing (with and without prior flattening) have confirmed that none of the eight pipes examined in the current work exhibited any such anisotropy, although the effects of flattening did tend to generate apparent anisotropy in the tensile test outcomes. It may therefore be appropriate to switch the focus of tensile testing to the axial direction, such that no flattening would be required.

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“…Some of this work is summarized in recent papers. [2][3][4][5] Specific details of the PIP procedure are described in several recent papers, [6][7][8][9][10][11] one of which is focused on the study of anisotropic samples. [9] There is therefore scope for using this testing methodology to study how prior differential plastic straining has affected the local response of a metallic component.…”

Section: Introductionmentioning

confidence: 99%

Use of Profilometry‐Based Indentation Plastometry to Study the Effects of Pipe Wall Flattening on Tensile Stress–Strain Curves of Steels

Warwick

Vaka

Fang

et al. 2023

steel research int.

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Herein, the flattening and subsequent tensile testing (in the hoop direction) of steel pipes used for transmission of oil and gas are concerned. A particular focus is on the use of a novel indentation plastometry test (PIP), applied to the outer free surface of an as‐received pipe. This allows a stress–strain curve to be obtained from a relatively small volume (a disk of diameter about 1 mm and thickness around 100–200 μm). Whole section and reduced section tensile testing, of as‐received and flattened samples are carried out. Four different pipes are studied. While there are some variations between them, there is a general trend for near‐surface regions of the pipe to be a little harder than the interior, and for flattened pipes to be a little harder than unflattened ones, although these are not dramatic or well‐defined effects. PIP testing also confirms that these pipes exhibit little or no anisotropy. It is in general concluded that PIP‐derived stress–strain curves for testing of the outside of a pipe are likely to be quite close to those obtained by tensile testing of the whole section in the hoop direction, after flattening.

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Extracting plastic properties from in-plane displacement data of spherical indentation imprint

Cited by 33 publications

References 49 publications

Estimation of Mechanical Properties of Aluminum Alloy Based on Indentation Curve and Projection Area of Contact Zone

Estimation of Mechanical Properties of Aluminum Alloy Based on Indentation Curve and Projection Area of Contact Zone

Profilometry‐Based Indentation Plastometry and Uniaxial Testing of Pipelines: Detection of In‐Plane Anisotropy and Potential for Simplification of Test Procedures

Use of Profilometry‐Based Indentation Plastometry to Study the Effects of Pipe Wall Flattening on Tensile Stress–Strain Curves of Steels

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