scholarly journals Кинетика развития паттернов макролокализации пластического течения металлов

2018 ◽  
Vol 60 (7) ◽  
pp. 1358
Author(s):  
Л.Б. Зуев ◽  
С.А. Баранникова ◽  
Б.С. Семухин
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission ◽  
Plastic Strain ◽  
Plastic Flow ◽  
Strain Localization ◽  
Plastic Distortion ◽  
Localization Zone ◽  
Distortion Tensor ◽  
The Relationship

AbstractThe features of the macroscopic inhomogeneity of plastic deformation in the form of autowaves with a pulsating amplitude are analyzed, and data on the localization of sources of acoustic emission at different stages of plastic flow in the stretching of fcc mono- and polycrystals are presented. The relationship between the local components of the plastic distortion tensor in the strain localization zone is traced. The role of acoustic phenomena accompanying the localization of plastic strain in the development of the process of plastic deformation is considered.

scholarly journals Studying Deformation Behaviors in Austenitic Stainless Steels within a Temperature Range of 143 K < T < 420 K

2021 ◽  
pp. 22-30
Author(s):  
S. A Barannikova ◽  
A. M Nikonova ◽  
S. V Kolosov
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Strain Localization ◽  
Work Hardening ◽  
Deformation Localization ◽  
Linear Hardening ◽  
Jerky Flow ◽  
Temperature Range ◽  
Α Phase ◽  
Flow Stage

This work deals with studying staging and macroscopic strain localization in austenitic stainless steel 12Kh18N9T within a temperature range of 143 K < T < 420 K. The visualization and evolution of macroscopic localized plastic deformation bands at different stages of work hardening were carried out by the method of the double-exposure speckle photography (DESP), which allows registering displacement fields with a high accuracy by tracing changes on the surface of the material under study and then comparing the specklograms recorded during uniaxial tension. The shape of the tensile curves σ(ε) undergoes a significant change with a decreasing temperature due to the γ-α'-phase transformation induced by plastic deformation. The processing of the deformation curves of the steel samples made it possible to distinguish the following stages of strain hardening, i.e. the stage of linear hardening and jerky flow stage. A comparative analysis of the design diagrams (with the introduction of additional parameters of the Ludwigson equation) and experimental diagrams of tension of steel 12Kh18N9T for different temperatures is carried out. The analysis of local strains distributions showed that at the stage of linear work hardening, a mobile system of plastic strain localization centers is observed. The temperature dependence of the parameters of plastic deformation localization at the stages of linear work hardening has been established. Unlike the linear hardening, the jerky flow possesses the propagation of single plastic strain fronts that occur one after another through the sample due to the γ-α' phase transition and the Portevin-Le Chatelier effect. It was found that at the jerky flow stage, which is the final stage before the destruction of the sample, the centers of deformation localization do not merge, leading to the neck formation.

Derivation of Stress, Strain, Temperature, Strain-Rate Relation for Plastic Deformation

1947 ◽  
Vol 14 (3) ◽  
pp. A229-A230
Author(s):  
J. D. Lubahn
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Strain Rate ◽  
Plastic Flow ◽  
Stress Strain ◽  
Rate Relation ◽  
Temperature Strain

Abstract This paper carries out the derivation and correction of an equation previously presented by J. H. Hollomon and the author, relating to stress for plastic flow (σ), plastic strain (ϵ), strain rate (ϵ.), and temperature (T).

Hardening Viscous Failure and Strain Localization during Severe Plastic Deformation

2006 ◽  
Vol 503-504 ◽  
pp. 551-556 ◽  
Author(s):  
Yan Beygelzimer ◽  
O. Prokof'eva ◽  
B. Efros ◽  
Viktor Varyukhin
Keyword(s):  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
Plastic Flow ◽  
Strain Localization ◽  
The State ◽  
Physical Mechanisms ◽  
Metal Materials

The analysis is made of effect and physical mechanisms of the influence of pressure on metal materials that are in the state of plastic flow, as well as on characteristics of materials undergone severe plastic deformation under pressure.

Role of superposition of dislocation avalanches in the statistics of acoustic emission during plastic deformation

2013 ◽  
Vol 88 (4) ◽  
Author(s):  
M. A. Lebyodkin ◽  
I. V. Shashkov ◽  
T. A. Lebedkina ◽  
K. Mathis ◽  
P. Dobron ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission

Mechanical Properties of Aluminium Processed by ECAP

2006 ◽  
Vol 114 ◽  
pp. 39-44
Author(s):  
Rafal M. Molak ◽  
Zbigniew Pakiela
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Plastic Strain ◽  
Room Temperature ◽  
Tensile Tests ◽  
Large Plastic Strain ◽  
Angular Pressing ◽  
Purity Aluminium ◽  
High Purity Aluminium ◽  
The Relationship

The aim of this study was to investigate the influence of large plastic strain on the microstructure and mechanical properties of aluminium processed by severe plastic deformation (SPD) by the Equal Channel Angular Pressing (ECAP) method. Polycrystalline high purity aluminium (99,99%) was pressed at room temperature to produce samples subjected to 4, 8 and 12 ECAP passes. The microstructure of aluminium was examined using a light polarized microscope. Microhardness measurements and tensile tests were undertaken to determine the mechanical properties of the material processed by ECAP. The results obtained show the relationship between the microstructure and the mechanical properties of the material.

The model of plastic deformation and failure of solids

2021 ◽  
pp. 75-83
Author(s):  
L.B. Zuev ◽  
◽  
V.V. Gorbatenko ◽  
L.V. Danilova ◽  
◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Acoustic Emission ◽  
Plastic Flow ◽  
Work Hardening ◽  
Scale Level ◽  
Macroscopic Scale ◽  
Deformation And Failure ◽  
New Model ◽  
Hardening Law

The new model is proposed to explain localized plasticity and failure development in solids. This is based on the idea about the interaction of plasticity acts with acoustic emission pulses. They are generated in the course of the elementary plasticity acts. It is shown experimentally that plastic flow is always localized on the macroscopic scale level. The distribution of localization in the volume has the form of different autowave processes and depends on the work hardening law.

Deformation Behavior and Plastic Strain Localization of Nanostructured Materials Produced by Severe Plastic Deformation

2009 ◽  
Vol 633-634 ◽  
pp. 107-119 ◽  
Author(s):  
Evgeny V. Naydenkin ◽  
Galina P. Grabovetskaya
Keyword(s):  
Plastic Deformation ◽  
Plastic Strain ◽  
Severe Plastic Deformation ◽  
Strain Localization ◽  
Deformation Behavior ◽  
Grain Boundary Sliding ◽  
Deformation Bands ◽  
Localized Deformation ◽  
Plastic Strain Localization ◽  
Structure Heterogeneity

The literature on the deformation behavior and plastic strain localization inherent to nanostructured metallic polycrystals produced by severe plastic deformation techniques is reviewed. The effects of the texture, structure heterogeneity and state of grain boundaries on the special features and evolution of mesoscopic and macroscopic localized deformation bands are investigated. The role of grain-boundary sliding in the development of mesoscopic plastic deformation bands is discussed.

scholarly journals Plasticity: from Crystal Lattice to Macroscopic Phenomena

2021 ◽  
Vol 22 (1) ◽  
pp. 3-57
Author(s):  
L. B. Zuev ◽  
S. A. Barannikova ◽  
V. I. Danilov ◽  
V. V. Gorbatenko
Keyword(s):  
Experimental Investigation ◽  
Plastic Deformation ◽  
Acoustic Emission ◽  
Plastic Flow ◽  
Basic Assumption ◽  
Nonequilibrium Systems ◽  
Flow Localization ◽  
Quasi Particle ◽  
Proposed Model ◽  
Flow Evolution

New representations concerning plasticity physics in crystals are discussed. The model of plastic flow is suggested, which can describe its main regularities. With the use of the experimental investigation, it is shown that the plastic flow localization plays the role in the evolution of plastic deformation. Obtained data are explained with the application of the principles of nonequilibrium-systems’ theory. The quasi-particle is introduced for the description of plasticity phenomenon. It is established the relation between plasticity characteristics of metals and their position in Periodic table of the elements. A new model is elaborated to address localized plastic-flow evolution in solids. The basic assumption of the proposed model is that the elementary plasticity acts evolving in the deforming of medium would generate acoustic emission pulses, which interact with the plasticity carriers and initiate new elementary shears. As found experimentally, the macrolocalization of plastic flow involves a variety of autowave processes. To address the phenomenon of localized plastic-flow autowaves, a new quasi-particle called ‘autolocalizon’ is introduced; the criterion of validity of the concept is assessed.

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