Study of adiabatic localized shear in metals by split Hopkinson pressure bar method

Pushkov, V. A.; Yurlov, Alexey; Bolshakov, A. P.; Podurets, A. M.; Кальманов, А В; Koshatova, E.

doi:10.1051/epjconf/20101000029

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Another restriction of cold shearing is that it cannot be used for tube or hallow profiles shearing because the resulted profile will be flattened [2]. Multiple topics from the literature review have been addressed on theoretical and experimental research upon the shearing process of metal bars [3,4], wire profiles [5] or sheet metal raw materials [6], including high speed shearing solutions and process finite element analysis [7,8].…”

Section: Introductionmentioning

confidence: 99%

Device for Precision Cold Shearing Using Bar Torsion

Neagoe¹,

Năsulea²

2019

RECENT

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The precision cold shearing is a production process used for intermediary parts or even final parts manufacture, from round metal bars or other laminated profiles, obtaining a high dimensional and geometric precision, and higher surface quality in comparison with conventional metal shearing processes. There are well-known two methods of precision cold shearing, by conventional shearing or by material torsion. The precision cold shearing by material torsion is suitable for parts manufactured from metal bars which do not have a round transversal section, or various laminated profiles, where the conventional shearing process is difficult to be implemented and to obtain similar results. In the literature, there is presented a special machine tool for metal bar shearing by material torsion. The disadvantage of this machine tool is that the manufacturing costs for such a machine tool are at a very high level. The paper presents a simple device for metal bar precision cold shearing by material torsion which can be easily implemented using a conventional simple action mechanical or hydraulic press. The device uses the principle of spatial material compression, before the proper shear, using a simple lever system, and it is recommended for precision cold shearing of hard and medium-hard materials.

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Section: Introductionmentioning

confidence: 99%

Device for Precision Cold Shearing Using Bar Torsion

Neagoe¹,

Năsulea²

2019

RECENT

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“…Shear stress-shear displacement curves of various microstructures at (A) RT and (B) CT. Shear stress-nominal shear strain curves of various microstructures for the experiments conducted at (C) RT and (D) CT. (E) Uniform dynamic shear strain vs. dynamic shear YS for the present MEA, along with data for other metals and alloys. (F) Impact shear toughness vs. dynamic shear YS for the present MEA, along with data for other metals and alloys[64,[150][151][152][153][154][155][156][157][158] . MEA: Medium-entropy alloy; RT: room temperature; YS: yield stress; CT: cryogenic temperatures.…”

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A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

Xu¹,

Wang²,

Li³

et al. 2022

Microstructures

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The CoCrFeMnNi alloy is one of the most notable first-generation high-entropy alloys and is also known as a Cantor alloy. This alloy was first proposed in 2004 and shows promising performance at cryogenic temperatures (CTs). Subsequent research has indicated that the equiatomic ternary CoCrNi medium-entropy alloy (MEA), as a subset of the Cantor alloy family, has better mechanical properties than the CoCrFeMnNi alloy. Interestingly, both the strength and ductility of the CoCrNi MEA are higher at CTs than at room temperature. CoCrNi-based alloys have attracted considerable attention in the metallic materials community and it is therefore important to generalize and summarize the latest progress in CoCrNi-based MEA research. The present review initially briefly introduces the discovery of the CoCrNi MEA. Subsequently, its tensile response and deformation mechanisms are summarized. In particular, the effects of parameters, such as critical resolved shear stress, stacking fault energy and short-range ordering, on the deformation behavior are discussed in detail. The methods for strengthening the CoCrNi MEA are then reviewed and divided into two categories, namely, modifying microstructures and adjusting chemical compositions. In addition, the mechanical performance of CoCrNi-based MEAs, including their dynamic shear properties, creep behavior and fracture toughness, is also deliberated. Finally, the development prospects of CoCrNi-based MEAs are proposed.

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2012

Adiabatic Shear Localization

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Study of adiabatic localized shear in metals by split Hopkinson pressure bar method

Cited by 7 publications

References 4 publications

Device for Precision Cold Shearing Using Bar Torsion

Device for Precision Cold Shearing Using Bar Torsion

A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys

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