Numerical analysis of the deformation instability of metals in liquid helium

Vorob’ev, E. V.; Anpilogova, T. V.

doi:10.1016/j.commatsci.2012.10.008

Cited by 10 publications

(9 citation statements)

References 13 publications

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“…Specific results have been obtained for typical cryogenic engineering materials: stable austenitic steel 03Kh20N16AG6 and aluminum alloy AMg5, which were studied in [5]. The numerical simulation is based on a nonlinear local one-dimensional multiparameter model [6] formulated as the following differential equation describing the dynamic equilibrium of the specimen-machine system during discontinuous deformation: been set up for a nonloaded system, which deforms at the expense of stored elastic energy only; therefore, its right-hand side does not describe the loading conditions.…”

Section: Methodsmentioning

confidence: 99%

“…The point is that a jump is a so rapid process that static loading hardly affects it. The contribution of the nominal deformation rate _ e n for a loaded system was estimated using a model in [5] where it was shown that e D increases noticeably (by 5% and more) only when _ e n ! 1 Â 10 À1 s À1 , which is approximately two orders of magnitude greater than the standard rate.…”

Section: Methodsmentioning

confidence: 99%

“…The low-temperature discontinuous yielding of metals is a very short-term process, which determines its energy balance. External loading is practically switched off, and the work of deformation is almost completely done at the expense of the stored elastic energy of the specimen-machine system [5]. After a strain jump, it decreases by…”

Section: Mechanisms and Energy Of The Processmentioning

confidence: 99%

“…The low-temperature discontinuous deformation of structural alloys in cryogenic engineering as a function of eight determining factors, including the material characteristics of metals and loading conditions, was plotted in [5]. The next step is numerical analysis of the kinetics of the discontinuous yielding of metals at a temperature of 4 K, including the determination of the deformation rate and acceleration and the strain jump duration depending on major factors influencing the process.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of low-temperature discontinuous deformation of metals

Vorob’ev

Anpilogova

2015

Cryogenics

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Mechanisms and Energy Of The Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of low-temperature discontinuous deformation of metals

Vorob’ev

Anpilogova

2015

Cryogenics

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“…mm/N, whereas the magnitudes s 0 2 . , s u in , s b in , B, and n are 1190, 1640, 2214, 2240 ÌPà, and 0.65, respectively [9].…”

mentioning

confidence: 99%

Influence of Machine Compliance on the Mechanical Characteristics of Materials in the Course of Static Tensile Testing

Vorob’ev

2015

Strength Mater

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ev UDC 539.4The influence of machine compliance on the standard mechanical characteristics of metallic materials is investigated. It is shown that with an increase of compliance percent elongation and reduction of area after fracture decrease by several times. At cryogenic temperatures ultimate strength can decrease to the level of yield strength due to the effect of jumplike deformation of metals.Many experimental data, including [1][2][3][4][5], provide evidence of the influence of compliance, or its inverse value -stiffness of loading system, on the mechanical behavior and characteristics of materials. This factor at the specified loading level determines the content of elastic energy W Ð = P 2 2, where P is the compliance of the specimen-machine system and P is the load. Potential energy transforms into the active form (energy of deformation or fracture) as soon as load starts decreasing. Using standard tensile tests of metals [6] the modulus of elasticity, limit of proportionality, yield strength (physical and offset) and ultimate strength (corresponding point within the border zone of the diagram) are determined on the ascending branch of the diagram load vs elongation. The rest standard characteristics of plastic materials such as percent elongation after fracture d and reduction of area of the cross section after fracture y are determined after passing through the stage of load fall on the descending branch of the diagram and final fracture of the specimen, i.e., they are subjected to the influence of compliance factor. Moreover, the magnitude of compliance is not regulated and for various tensile testing machines it can differ by an order and even more, since the range of their ultimate loads is very wide (0.5-1000 kN) [7]. It is required to evaluate the degree of the influence of compliance on the specified mechanical characteristics.Let us consider the diagram of static tension with control of the displacement (severe conditions) of the specimen made of plastic metal, which equation of state is described by the exponential function of the following type:where s and e are the true stress and strain, A and m are the constants, 0 1 £ £ m . It is assumed that the specimen made of uniform anisotropic material undergoes fracture upon attainment of some critical stress s c without necking (its contribution to the total elongation magnitude is insignificant). From Eq. (1) the relation for the description of the diagram "load P vs elongation Dl" is obtained under tension of the specimen with the initial cross-sectional area F 0 and initial calculated gauge length l 0 (extensometer gauge length): P AF l l l l m = + + 0 0 0 1 1 [ln( )] ( ). D D (2) 0039-2316/15/4704-0561

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Jumplike Deformation as the Scale Effect Measure for the Metal Deformed Volume Under Deep-Freezing Conditions: Experiment and Modeling

Vorob’ev

Anpilogova

2014

Strength Mater

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Numerical analysis of the deformation instability of metals in liquid helium

Cited by 10 publications

References 13 publications

Kinetics of low-temperature discontinuous deformation of metals

Kinetics of low-temperature discontinuous deformation of metals

Influence of Machine Compliance on the Mechanical Characteristics of Materials in the Course of Static Tensile Testing

Jumplike Deformation as the Scale Effect Measure for the Metal Deformed Volume Under Deep-Freezing Conditions: Experiment and Modeling

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