On deformation and damage micromechanisms in strong work hardening 2198 T3 aluminium alloy

Buljac, Ante; Hild, François; Helfen, Lukas; Morgeneyer, Thilo F.

doi:10.1016/j.actamat.2018.01.026

Cited by 22 publications

(17 citation statements)

References 58 publications

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“…Due to the gray-scale pixel noise, a fictitious strain of about 1.5% was registered. This method is similar to the test performed by Buljac et al [45]. However, they registered an error of 0.3% in a DVC analysis, compared to 1.5% in this DIC analysis.…”

Section: Experimental Results On Etched Specimensupporting

confidence: 81%

Comparing In Situ DIC Results from an Etched Surface with a Gold Speckled Surface

Paulsen

Fagerholt

Westermann

2019

Metals

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A ferrite-pearlite two-phase steel was investigated using in situ scanning electron microscope (SEM) tensile testing combined with digital image correlation (DIC). Two different speckled patterns were used and compared. The first pattern was achieved by etching a polished surface in order to reveal the microstructural features. Second, a gold speckled pattern was obtained. Here, a continuous layer of gold was applied to a polished surface. This continuous layer was remodeled into gold nanoparticles by keeping the specimen at 180 °C for 96 h with an Ar/Styrene mixture flowing across the specimen surface. The result is randomly distributed gold nanoparticles on the surface. These particles and the etched microstructure were then used by the DIC software to correlate an image series to obtain the local strain field of the material. The differences between the two techniques are numerous. Considering the etched surface, most microstructural features were grain boundaries and pearlite lamellas. As a consequence, large areas within grains did not provide sufficient contrast for DIC, thus restricting maximum resolution. However, the technique is fast and does not expose the material to any elevated temperatures. In contrast, the gold remodeling method provides a finely dispersed gold speckle pattern on the surface, giving excellent contrast across the recorded area. DIC with gold particles achieved a spatial resolution of 0.096 µm, compared to 2.24 µm in the DIC for the etched specimen. As a result, DIC with gold speckles can resolve slip lines. Conversely, DIC with etched microstructure resolves local strains on grain level. However, it is less cumbersome and faster to perform the test on the etched specimen.

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Section: Experimental Results On Etched Specimensupporting

confidence: 81%

Comparing In Situ DIC Results from an Etched Surface with a Gold Speckled Surface

Paulsen

Fagerholt

Westermann

2019

Metals

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“…Strain hardening ratio, which is also named as work hardening ratio, is hereby introduced to analyze mechanical behaviors for TPU. The ratio acts as an important parameter to represent uniform deformation capacity of material . It is usually utilized as n from the material's constitutive equation: σ = K ⋅ ε n , and n is then calculated based on the following formula:

n = \frac{\ln σ_{2} - \ln σ_{1}}{\ln ε_{2} - \ln ε_{1}}

…”

Section: Resultsmentioning

confidence: 99%

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Miao

2020

Polymer Engineering & Sci

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The uniaxial tension experiments are performed on thermoplastic polyurethane to investigate its mechanical behaviors and related potential mechanisms, and the loading strain rate is designing to be wide ranging from 0.0001 to 1 s −1 . It is found that the polyurethane presents an obvious rate-dependence, and the stress strain curves share distinct strain hardening characteristics under the investigated strain rates. Furthermore, the strain hardening ratios are sharing nearly same trends and appear to be influenced by both strain rate and the induced adiabatic heating. Besides, the ratio is also strain-dependent on previous loading history. Then, a two-dimension unit cell model is built to investigate potential equivalent mechanisms, of which the hard phase as inclusion is equivalent with crystallization zone, crosslinking sites, and so forth. The simulation results facilitate to explain the distinct strain hardening ratios, even for the matrix from the extrapolated curves under super-low strain rate loading. Finally, the analogic mechanisms of equivalent hard inclusions are proposed, which can reasonably explain the strain rate-and strain-dependence characteristics of polyurethane mechanical behaviors. K E Y W O R D Smechanical properties, polyurethane, strain hardening ratio, structure-property relations, tension

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“…Recently, experiments were carried out on notched thin specimens to evaluate strain fields ahead of notches using a combination of in situ laminography and digital volume correlation (DVC) as a way of non-destructively studying damage and strain developments at the micrometre scale in sheet-like samples (Morgeneyer et al, 2014(Morgeneyer et al, , 2016Buljac et al, 2018). Synchrotron laminography allows regions of interest in plate-like samples to be imaged at micrometre resolution (Helfen et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

On crystallographic aspects of heterogeneous plastic flow during ductile tearing: 3D measurements and crystal plasticity simulations for AA7075-T651

Morgeneyer

Khadyko

Buljac

et al. 2021

International Journal of Plasticity

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On deformation and damage micromechanisms in strong work hardening 2198 T3 aluminium alloy

Cited by 22 publications

References 58 publications

Comparing In Situ DIC Results from an Etched Surface with a Gold Speckled Surface

Comparing In Situ DIC Results from an Etched Surface with a Gold Speckled Surface

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

On crystallographic aspects of heterogeneous plastic flow during ductile tearing: 3D measurements and crystal plasticity simulations for AA7075-T651

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