On the experimental characterization of crystal plasticity in polycrystals

Tatschl, A.; Kolednik, O.

doi:10.1016/s0921-5093(02)00278-2

Cited by 44 publications

(31 citation statements)

References 20 publications

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“…An exhaustive literature exists on heterogeneous deformation in single-phase metals and alloys [1][2][3][4][5][6][7][8][9][10][11]. Such studies are mostly concerned with differences in the extent of deformation, and the corresponding differences in microstructural developments.…”

mentioning

confidence: 99%

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Heterogeneous Deformation in Single‐Phase Zircaloy 2

Sahoo

Hiwarkar

Samajdar

et al. 2008

Ceramic Transactions Series

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mentioning

confidence: 99%

“…An exhaustive range of the published literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14] exists on this subject. Typically in single-phase polycrystalline metals, differences in strain are observed between different grains and also inside the same grain.…”

mentioning

confidence: 99%

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Sahoo

Hiwarkar

Samajdar

et al. 2008

Ceramic Transactions Series

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“…The cut surface of the split-specimen was ground and mechanically polished with procedures similar to metallographic sample preparation. This preparation is required for determining plastic strain distributions near the loaded edges by comparing scanning electron microscopy (SEM) micrographs from this region before and after loading or after different loading cycles [21][22][23][24].…”

Section: Physical Simulation Of Edge Loadingmentioning

confidence: 99%

“…The strain field was determined from the split plane by comparing SEM micrographs of the edge region on the split plane before and after loading via digital image analysis [22]. Again, the entire plastically deformed zone can be characterised only for loads up to about 10 kN.…”

Section: Strain Fieldsmentioning

confidence: 99%

Fatigue damage mechanisms and damage evolution near cyclically loaded edges

Ebner¹,

Gruber²,

Ecker³

et al. 2010

Bulletin of the Polish Academy of Sciences: Technical Sciences

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Abstract.A combined experimental and numerical approach was applied to develop a basic understanding of the fatigue damage process taking place at edges exposed to cyclic mechanical loads.A recently developed cyclic edge-loading test was used in order to simulate the fatigue loading of the edges of manufacturing tools and to study the microscopic damage mechanisms. Accompanying finite element calculations were performed to provide a better understanding of the loading conditions at edges subjected to cyclic mechanical loads. A comparison of the numerical simulation with the experimental results revealed good accordance.Main results of the investigations are the distribution of plastic strains and their evolution with increasing number of cycles, the distribution of the residual stresses, the localisation and the evolution of damage at the microscale (microcracks and voids), and the localisation and growth of fatigue cracks.Micro-damage develops in the entire plastically deformed region. Fatigue crack nucleation was mainly found in deformation bands and fatigue crack growth was only observed near the transition region between the extensively and the slightly plastically deformed zone not at the loaded area but at the side area. The reason for that phenomenon is the formation of tensile residual stresses in this region which is favouring fatigue crack growth.

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“…Through the use of full-field measurements and detailed numerical simulations the notion that plastic deformation evolves in a homogeneous manner both in regards to space and time has been discredited-particularly at small scales, where significant inhomogeneities have been observed [1][2][3][4][5][6][7][8]. Although such heterogeneities can be adequately modeled in a multiscale or strain gradient framework [9][10][11][12], the question central for determining a material representative volume element (RVE) still remains: at what length and time scale, if any, can mechanical behavior be averaged over in order to achieve a result lacking spatial correlation that may serve as an approximation to (idealized) homogeneous response?…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Thermal Inhomogeneities During Compression of Highly Textured Zirconium

et al. 2010

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Using a focal plane array infrared camera, the heat generated during large strain compression (at a rate of 1 s −1 ) is used to study the characteristics of plastic flow for hcp zirconium. Heat generation during plastic flow in a reference material, copper, was seen to develop uniformly both at the lower (40 μm/pixel) and higher (8 μm/pixel) magnifications used in this study. The thermomechanical response of Zr, however, was seen to depend on the loading direction with respect to the specimen texture. Highly textured zirconium compressed along nonbasal oriented grains results in a homogeneous thermal response at both scales. However, compression along basal (0001) oriented grains shows evidence of inhomogeneous deformation at small strains that lead to macroscale localization and failure at large strains. The conversion of plastic work into heat is observed to be a dynamic process, both in the timedependent nature of the energy conversion, but also in the passage of waves and 'bursts' of plastic heating. Basal compression also showed evidence of small scale localization at strains far below macroscale localization, even below 10%. These localizations at the lower strain levels eventually dominate the response, and form the shear band that is responsible for the softening of the macroscopic stress-strain curve.

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On the experimental characterization of crystal plasticity in polycrystals

Cited by 44 publications

References 20 publications

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Heterogeneous Deformation in Single‐Phase Zircaloy 2

Fatigue damage mechanisms and damage evolution near cyclically loaded edges

Spatiotemporal Thermal Inhomogeneities During Compression of Highly Textured Zirconium

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