Distinctive test for tungsten wires with different splitting properties

Gaal, I.; Tóth, A.L.; Uray, L.; Harmat, P.

doi:10.1016/j.ijrmhm.2005.10.005

Cited by 5 publications

(3 citation statements)

References 17 publications

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“…Yield point phenomena occur in a surprisingly wide range of materials and can have various causes. [ 10,19–35 ] Lüders‐like deformation behaviour may be observed in TRIP steels, [ 36,37 ] shape memory alloys, [ 38 ] and also in cellular [ 39 ] and granular materials under compression. [ 40 ]…”

Section: Extracting the Real Upper Yield Strength The Real Lower Yield Strength And The Flow Curve In The Lüders Regionmentioning

confidence: 99%

Extracting true stresses and strains from nominal stresses and strains in tensile testing

Schwab

Harter

2021

Strain

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Seemingly a simple task, the extraction of the flow curve (true stress vs. true plastic strain) from nominal stresses and strains in standard tensile testing still has its unsolved points. This study addresses two of them: (i) in materials without yield point phenomenon (or generally in the region of homogeneous plastic deformation), the true stress is typically calculated assuming constant volume, ignoring the elastic volume changes. Here, we derive a set of exact analytical solutions for true stresses and strains with remarkable simplicity and beauty that fully account for the elastic volume changes. This set of exact solutions is cross‐checked by finite element simulations as well as zeroth‐ and first‐order approximations; perfect agreement has been found. (ii) In materials with a pronounced yield point phenomenon, a complicated three‐dimensional stress state inevitably arises at the edge of the Lüders bands, which masks the real (or inherent) material behaviour. To determine the real material behaviour in the Lüders region, here we use a new macroscopic analytical approach characterised by a high true upper yield point, a typical strain hardening behaviour common for many materials, and the triaxiality of the stress state that inevitably develops at the edges of the Lüders bands and that determines the stress level at the observed lower yield point. This approach is verified by experiments (including video observations as well as digital image correlation (DIC) strain distribution measurements) and finite element simulations with very good agreement.

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Section: Extracting the Real Upper Yield Strength The Real Lower Yield Strength And The Flow Curve In The Lüders Regionmentioning

confidence: 99%

Extracting true stresses and strains from nominal stresses and strains in tensile testing

Schwab

Harter

2021

Strain

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“…6 produced by the formation of one Lüders band is same, the total length increase (Δl t ) is much larger in the thinner Lüders band even in the same total deformation region (H) of the gage length. Because the Lüders band width (w) is equivalent to the grain size, [40][41][42] the increase in Lüders strain with decreasing grain size to the critical grain size can be attributed to the thinner Lüders band width (w).…”

Section: Grain Size and Lüders Strainmentioning

confidence: 99%

A Universal Equation Governing Engineering Stress-strain Curves of Polycrystals

Heo

Kim

2016

ISIJ Int.

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“…Like in steels, the interaction between solute atoms and/or small precipitates and dislocations in Mg can strongly influence the flow behavior and can lead to plastic instabilities detectable at the macroscopic scale 28 . Although first described more than 150 years ago, the studies on plastic instabilities have mostly been carried out on steels 32 and other body-centered cubic (bcc) 33 metals. The number of studies on this subject in Mg alloys is limited.…”

Section: Introductionmentioning

confidence: 99%

Influence of deformation banding instabilities on small scale yielding of a Mg–Nd alloy revealed by in-situ digital image correlation

Васильев

Wang

Zhu

et al. 2023

Sci Rep

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Propagating deformation bands are observed to accommodate the initial plasticity in an as-extruded Mg–1.5Nd alloy under tension using digital-image-correlation. The propagating bands cause an uncommon plateau in the stress–strain response of the alloy prior to restoring a common decreasing work hardening with further straining. Effects of the deformation banding and underlying plateau in the flow stress on small scale yielding are investigated during low cycle fatigue (LCF) and tension of notched specimens. Alternating formation/disappearance of deformation bands in the gauge section of as-extruded LCF specimens during testing is observed to reduce life compared to annealed specimens exhibiting no instabilities. In contrast, the bands deflect the plastic zone ahead of the notch from the principal plane orthogonal to the applied loading inducing positive effect on toughness of the alloy.

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Distinctive test for tungsten wires with different splitting properties

Cited by 5 publications

References 17 publications

Extracting true stresses and strains from nominal stresses and strains in tensile testing

Extracting true stresses and strains from nominal stresses and strains in tensile testing

A Universal Equation Governing Engineering Stress-strain Curves of Polycrystals

Influence of deformation banding instabilities on small scale yielding of a Mg–Nd alloy revealed by in-situ digital image correlation

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