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164 Result(s)
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Article
Localized Plasticity Pattern at the Prefracture Stage: Origin and Development
A pattern of macroscopic deformation bands with a characteristic size of ~10 mm was revealed experimentally in a uniaxially deformed sample at the prefracture stage prior to macroscopic necking. The bands move...
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Article
Self-Excited Plastic Deformation Instability during Tension of Nickel
The behavior of the localized plasticity fronts corresponding to self-excited deformation instability, which repeatedly pass through the same region in semifinished NP2 nickel specimens (Ni ≥ 98.5 wt %), is in...
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Article
Plastic Flow Autowaves and the Periodic Table of the Elements
Plastic flow patterns are considered for nineteen metals from the 3rd, 4th, 5th, and 6th periods of the Periodic Table of the Elements. A conditional plasticity characteristic has been introduced, and its relatio...
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Article
Localized Plasticity Autowaves Evolution in Aluminium
The kinetics of plastic flow localization foci in polycrystalline Al is investigated at room temperature via double-exposure speckle photography. Plastic flow instability in the form of periodically changing s...
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Article
Macroscopic Plastic Flow in Solids. The Basic Model
The autowaves of localized plastic flow are considered for the stages of easy glide and linear work hardening in a number of metals. The propagation rates were determined experimentally for the autowaves in qu...
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Article
Autowave Process of Plastic Flow in Cu–Ni Alloys
This work is aimed at studying the effect of Ni content in Cu–Ni alloys on the localization of plastic flow under uniaxial tension. The regularities of localized plastic flow at different stages of work harden...
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Article
The Autowave Concept of Plastic Flow
The fundamentals of the autowave theory of plasticity of solids, which are currently being developed in plasticity physics, are outlined. The main ideas of a new approach based on taking the decisive role of m...
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Article
Autowave Description of the Lüders and Portevin–Le Chatelier Phenomena
The kinetics of Chernov–Lüders and Portevin–Le Chatelier deformation processes at the yield plateau in an aluminum-magnesium alloy is analyzed. It is established that the deformation is localized in moving def...
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Article
Autowave Plasticity of Hydrogen-Charged Alloys
This paper proposes an autowave description of localized plastic flow in solids for hydrogen-charged metals. Experiments showed that plastic flow is always localized on the macroscopic scale and the localizati...
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Article
Integrated Analysis of Mechanical and Acoustic Properties of Materials
A model of evolution of the localized plastic flow of a solid is considered based on the idea of interaction of plastic flow carriers and signals of acoustic emission pulses originating during elementary plast...
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Article
Deformable Material as a Nonlinear Active Medium
The regularities of the formation of localized plastic flow autowaves in metals upon Lüders and Portevin–Le Chatelier deformations are considered taking into account the difference in the microscopic plastic f...
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Article
Plastic Flow as Spatiotemporal Structure Formation. Part I. Qualitative and Quantitative Patterns
Here we present an extended autowave concept of localized plastic flow in solids, its main definitions, and substantiation. The concept is supported by experiments showing that localization is always...
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Article
Plastic Flow as Spatiotemporal Structure Formation. Part II. Two-Level Description
Here we present a description of plastic flow macrolocalization in deformed materials as nonlinear systems continuously changing their structure on two spatiotemporal mesoscales. The kinetics of stru...
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Article
Model of Plastic Deformation and Failure of Solids
A model of localized plastic flow development based on the idea about interaction between plasticity carriers and acoustic emission pulses generated by develo** elementary plasticity acts is proposed. It is ...
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Article
Nature of the Elastic-Plastic Strain Invariant
The nature of the elastic-plastic strain invariant is considered. It is shown that the absolute values of the invariant obtained in experiments obey the normal distribution. The contributions of the scale and ...
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Article
Autowave Description of Plasticity of Materials with an Unstable Phase Structure at the Macroscale Level
We consider the regularities of a plastic flow in materials with strain-induced phase transformation in titanium nickelide and trip steel as examples. The experimental analysis of plastic deformation processes...
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Article
Temperature Dependence of Autowave Characteristics of Localized Plasticity
The behavior of localized plastic flow autowaves in a Fe–Ni–Cr alloy at temperatures 143 K ≤ T ≤ 420 K is considered. The temperature variation of the autowave propagation velocity is studied. It is found that, f...
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Article
Relaxation Mode of Macroscopic Plastic Deformation in Metals
The relaxation of elastic energy during macroscopic plastic deformation in a rigorous formulation is determined by solutions of the system of nonlinear equations of mechanics of a deformable solid. Using metho...
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Article
The Temperature Dependence of the Autowave Mechanism of Plastic Flow
The behavior of characteristics of localized plastic flow autowaves in a Fe–Cr–Ni alloy in the temperature interval of 143 ≤ T ≤ 420 K (0.34 ≤ T/ΘD ≤ 1), where ΘD = 420 K is the Debye temperature (parameter), is ...
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Article
Autowaves of Localized Deformation Induced by Phase Transformation
An approach and a model of the birth and development of deformation bands and their fronts under plastic deformation due to phase transformation are proposed. A solid body is considered as an open nonequilibri...