16 Result(s)
within
L. B. Zuev
Mechanical Engineering
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Article
Entropy Interpretation of the Elastic–Plastic Strain Invariant
An interpretation of the nature of the relation between elastic and plastic strains, called the elastic–plastic strain invariant, is proposed which takes into account the change in the entropy of the system du...
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Article
Chernov–Luders and Portevin–Le Chatelier deformations in active deformable media of different nature
The development of macroscopic inhomogeneities in the form of Chernov–Luders bands and serrated deformation bands (Portevin–Le Chatelier effect) in plastic metal flow is studied. For these two cases, regularit...
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Article
Elastoplastic invariant relation for deformation of solids
This paper considers the basic laws of localized plastic flow in solids obtained from an experimentally established relation invariant for plastic and elastic deformation that determine the propagation velocit...
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Article
Evolution of strain localization autowaves in a zirconium alloy and evaluation of plasticity margin in a rolling area
The stress-strain state of a zirconium alloy in a cold rolling area is studied by considering the evolution of strain localization autowaves and changes in the ultrasound velocity. It is found that in the regi...
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Article
Laboratory observation of slow movements in rocks
It is established that the development of a localized plastic strain during compression of samples of rocks (sylvinite, marble, and sandstone) deformed by different micromechanisms has an autowave character. I...
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Article
Specific features of laser cutting of steel sheets and monitoring of sample quality after laser influence
An automated laser system with an 8-kW quantum generator with the beam quality not worse than that of a single-mode laser is described. The possibility of using such a system in procurement production for cutting...
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Article
Types of Localization of Plastic Deformation and Stages of Loading Diagrams of Metallic Materials with Different Crystalline Structures
Macrolocalization, which accompanies the process of plastic deformation beginning from the yield point and ending by fracture, is determined by the staged character of material-loading diagrams. The evolution ...
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Article
Plastic Flow Localization in Commercial Zirconium Alloys
The behavior of plastic flow curves and patterns of plastic strain localization were studied for tension of samples of Zr — 1% Nb (É110 alloy) and Zr — 1% Nb — 1.3% Sn — 0.4% Fe (É635 alloy) were studied. The ...
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Article
Structural strength of welded joints in blast furnace jackets
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Article
Effect of the grain size on the wavelength of localized strain in aluminum specimens in tension
This paper studies the dependence of the wavelength of localized plastic strain at the parabolic stage of strain hardening on the grain size in polycrystal aluminum. This dependence is determined in the grain‐...
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Article
Possibility of evaluation of strength of metals and alloys by a nonintrusive ultrasonic method
The dependence of the propagation velocity of ultrasonic waves on the acting stress in plastically deformable polycrystalline metals and alloys is examined. The relationship between the acting stress and the v...
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Article
Heterogeneity of Plastic Flow of Zirconium Alloys with a Parabolic Law of Strain Hardening
The specific features of plastic–strain macrolocalization at the stage of the parabolic law of strain hardening in samples from industrial zirconium–based alloys are considered. It is shown that in predeformed...
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Article
The velocity of ultrasound in low-carbon steel deformed at the low yield limit
The variation of a thin structure upon deformation of low-carbon steel at the yield limit is analyzed. The character of the interrelationship between the stage nature of a plastic flow of low-carbon steel and ...
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Article
Acoustic evaluation of the endurance of steel specimens and recovery of their serviceability
A study is made of the possibility for evaluation of damage accumulation during fatigue loading by measuring the ultrasound velocity. It is shown that the dependence of the ultrasonic velocity on the number of...
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Article
A model of the viscous-brittle transition upon fracture of metals and alloys
A model of the viscous-brittle transition upon fracture of metals and alloys that is based on the competition of the processes of microcrack development and dislocation generation is proposed. Micropores which...
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Article
Stress distribution at the tip of a growing crack
High-speed motion-picture photography and an optical method of stress analysis have been used to study the distribution of elastic stress fields at the tip of a crack growing at a fast rate. The existence of s...
