Simple Shear: Double-Stage Deformation

Beygelzimer, Yan; Valiev, Ruslan Z.; Varyukhin, Viktor

doi:10.4028/www.scientific.net/msf.667-669.97

Cited by 10 publications

(8 citation statements)

References 9 publications

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“…Segal [27] proposed that the simple shear played a very important role in the SPD process. Notably, the central square grid just rotates a certain angle (a representative grid II), similar to that during elongation, according to Beygelzimer's two-stage character of a simple shear deformation hypothesis [28]. Compared to the only rotation of central grids, the ones in the circumferential direction, not only rotate, but also change the sides (a representative grid III).…”

Section: Flow Netmentioning

confidence: 96%

A novel severe plastic deformation method for fabricating ultrafine grained pure copper

Wang

et al. 2013

Materials & Design

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Section: Flow Netmentioning

confidence: 96%

A novel severe plastic deformation method for fabricating ultrafine grained pure copper

Wang

et al. 2013

Materials & Design

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“…An important feature of simple shear determining microstructure formation in metallic materials is that, unlike pure shear, it leads to an early formation of shear bands and their further transformation into ultrafine grains. [14][15][16] Analyzing the process of simple shear, the authors showed in various studies [17,18] that such a shear forms a separate group of geometric transformations, different from the one typical for pure shear. It turns out that the von Mises strain satisfies the group properties of simple shear, but the Hencky strain does not.…”

Section: Simple and Complex Loading Of A Billet During Deformationmentioning

confidence: 99%

Section: Simple and Complex Loading Of A Billet During Deformationmentioning

confidence: 99%

Large and Severe Plastic Deformation of Metals: Similarities and Differences in Flow Mechanics and Structure Formation

2021

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Large and severe plastic deformations (SPD) are two widely known approaches for the processing of metallic billets that have a different effect on the microstructure and physicoÀmechanical properties of materials. After a large deformation is implemented, for example, by longitudinal rolling or drawing, dislocation substructure cells and microbands are formed in billets. As a result of SPD, in particular, after equal-channel angular pressing (ECAP), ultrafine nanoscale grains are formed in metals, [1,2] which provides their high mechanical and functional properties. Herein, in both cases, structure formation is largely conditioned by the patterns in the mechanics of plastic deformation. The difference in the produced microstructures is determined by different scalar and vector characteristics of large and severe strains. In the former case, monotonic strain accumulation takes place in a billet. In the latter case, due to the active nonmonotonic deformation of a billet, heavy strain is accumulated, and rotational modes are realized, which, as a result, produces shear bands with further formation of ultrafine grains with high-angle grain boundaries. As a conclusion, a more precise definition of SPD is introduced, and recommendations are given for increasing the efficiency of the process of UFG structure formation in metals.

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“…It has been argued [20] that a transition to a logarithmic dependence of equivalent strain will occur when the grain size reaches a minimal value and has saturated. All such approximations are valid for ideal plastic solid with no strain hardening.…”

Section: Definition Of the Strain Imposed In Hptmentioning

confidence: 99%