A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing

Petegem, S. Van; Guitton, Antoine; Dupraz, Maxime; Bollhalder, A.; Sofinowski, K.; Upadhyay, Manas Vijay; Swygenhoven, H. Van

doi:10.1007/s11340-016-0244-0

Cited by 27 publications

(8 citation statements)

References 56 publications

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“…In order to study the force-strain response of the cruciform samples under uniaxial and equibiaxial load paths, deformation tests using a mini-biaxial machine developed at Paul Scherrer Institute [17] are performed in combination with macroscopic digital image correlation (macro-DIC) analysis. The ECMM thinning process produces a mirror-like surface that does not give reflections to serve as DIC pattern.…”

Section: Macroscopic Digital Image Correlationmentioning

confidence: 99%

“…To gain insight into the dependence of the mechanical behavior on the strain paths, several biaxial deformation devices, using cruciform-shaped samples, have been employed in combination with microscopy, X-ray and neutron diffraction methods [4,[10][11][12][13][14][15][16][17]. Significant work has been done to optimize the cruciform geometries in order to reach high plasticity at the center, avoid fracture at the cruciform arms, reduce the stress heterogeneity in the center of the cruciform and prevent shear loading in the cruciform arms [18].…”

Section: Introductionmentioning

confidence: 99%

“…Recently a miniaturized biaxial tensile device that can be installed on synchrotron beamlines and inside scanning electron microscopes (SEMs) has been developed [17]. The implementation in an SEM allows performing in-situ deformation studies while undertaking high-resolution digital image correlation (HRDIC).…”

Section: Introductionmentioning

confidence: 99%

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A High Resolution Digital Image Correlation Study under Multiaxial Loading

et al. 2018

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In this study, a miniaturized cruciform-shaped sample geometry which allows reaching high plastic strain under equibiaxial loading with reduced thickness at the test section is presented. The thinning method results in excellent surface quality that can be used for electron backscatter diffraction (EBSD) and high-resolution digital image correlation (HRDIC) investigations. The new cruciform geometry is used to study the slip activity in metastable austenitic stainless steel 304 during uniaxial and equibiaxial deformation using HRDIC. The results are discussed with respect to the Schmid law and the effect of multiple slip activity on the nucleation of martensitic transformations.

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Section: Macroscopic Digital Image Correlationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A High Resolution Digital Image Correlation Study under Multiaxial Loading

et al. 2018

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“…2: uniaxial (UN), equibiaxial (EQ), triangular (TR) and square (SQ). The deformation tests were performed on the cruciform samples employing an upscale version of the minibiax tensile machine [35], hereafter called the meso biaxial tensile machine. The device has a very similar setup as the minibiax but a higher load capacity up to 1000 N. More details about the machine parameters can be found in the supplementary material.…”

Section: Methodsmentioning

confidence: 99%

Deformation and Degradation of Superelastic NiTi Under Multiaxial Loading

et al. 2018

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The degradation of the superelastic properties of a commercial NiTi alloy is studied during uniaxial, biaxial and load-path-change cycling performed in-situ with synchrotron X-ray diffraction. Careful examination of the diffraction pattern during uniaxial loading shows the R-phase as a transition between the austenite and the B19 0 martensite. Degradation of the superelasticity is found to depend strongly on the loading and unloading path followed, and it is discussed in terms the B19 0 martensitic variant selection, the accumulation of dislocations, and the residual R-Phase and B19' martensite. Cycling biaxially leads to faster degradation than uniaxially due to a larger accumulation of dislocations. If the deformation cycle contains a load path change, dislocation accumulation increases further and more martensite is retained.

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“…To address the second challenge, a variety of in situ SEM deformation stages have been developed to explore different deformation modes [38]: e.g., uniaxial tension [10,[39][40][41], biaxial tension [28,42,43], shear deformation [44]. However, regardless of how miniaturized such setups are, once installed in the SEM chamber, the geometrical requirements of different imaging modes (e.g.…”

Section: Introductionmentioning

confidence: 99%

Tracking Microstructure Evolution in Complex Biaxial Strain Paths: A Bulge Test Methodology for the Scanning Electron Microscope

Plancher

Vonk

et al. 2019

Exp Mech

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In this work, a novel method is presented to track site-specific microstructure evolution in metallic materials deformed biaxially along proportional and complex strain paths. A miniaturized bulge test setup featuring a removable sample holder was designed to enable incremental measurements to be performed in a scanning electron microscope, by probing the same position on the sample at different deformation levels, with electron backscatter diffraction (EBSD), electron channeling contrast imaging (ECCI) and other imaging modes.Validation experiments were performed at room temperature on samples prepared from commercial sheet metal (dual-phase steel) and foils (stainless steel). Local strain measurements with the digital image correlation technique confirmed that proportional strain paths with a strain ratio up to 5 can be investigated using elliptical dies in the bulge test holder. It is also shown how complex strain paths can be obtained using a combination of overlapping elliptical dies. Incremental EBSD and ECCI were conducted in configurations relevant for the multi-scale investigation of localized plasticity and damage mechanisms in dual-phase steel. Quantitative information regarding microstructure evolution (phase fractions, orientation fields, dislocation structures, etc.) and regarding local strain distributions could be successfully obtained. This type of data sheds light on underlying deformation mechanisms and provides opportunities to calibrate crystal plasticity models.

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A Miniaturized Biaxial Deformation Rig for in Situ Mechanical Testing

Cited by 27 publications

References 56 publications

A High Resolution Digital Image Correlation Study under Multiaxial Loading

A High Resolution Digital Image Correlation Study under Multiaxial Loading

Deformation and Degradation of Superelastic NiTi Under Multiaxial Loading

Tracking Microstructure Evolution in Complex Biaxial Strain Paths: A Bulge Test Methodology for the Scanning Electron Microscope

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