Physical Mesomechanics最新文献_第9页

Electrical Disintegration of Reinforced Concrete: Experiment and Simulation 钢筋混凝土的电解体：实验与模拟

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2025-02-12 DOI: 10.1134/S1029959924601106

R. A. Bakeev, A. S. Yudin, N. S. Kuznetsova, D. V. Zhgun, Yu. P. Stefanov

{"title":"Electrical Disintegration of Reinforced Concrete: Experiment and Simulation","authors":"R. A. Bakeev, A. S. Yudin, N. S. Kuznetsova, D. V. Zhgun, Yu. P. Stefanov","doi":"10.1134/S1029959924601106","DOIUrl":"10.1134/S1029959924601106","url":null,"abstract":"The paper reports on physical experiments on disintegration of reinforced concrete by the electric pulse method based on the Vorobiev effect. Concrete is fractured under the action of a compression wave propagating from the discharge channel between the electrode on the concrete surface and the reinforcement. Disintegration experiments are conducted on pebble concrete. It is shown that a single pulse results in separate cracks in the material on retention of its integrity. Disintegration of concrete and cavitation at the point of application of the electrode begin after the second or third pulse. Computer simulation is made for the action of an expanding discharge channel on reinforced concrete. A structural model of reinforced concrete is plotted, explicitly taking into account its main constituents, namely, cement, stone inclusions, and reinforcement. The inelastic behavior of cement is described within the modified Drucker–Prager–Nikolaevsky model with the nonassociated flow rule for quasi-brittle media. Cracking is simulated using the fracture criterion based on tensile stresses. The performed numerical simulation confirms the conclusions of the physical experiment: a single pulse causes the formation of separate cracks parallel to the free surface, and the network of horizontal, vertical and inclined cracks appears in the cement after 2–3 pulses, resulting in a cavity at the point of application of the electrode. Cavitation in reinforced concrete is governed by the presence of stone inclusions, whose boundaries serve as sites of redistribution of maximum tensile stresses and formation of vertical and inclined cracks, as well as of accumulation of irreversible strains and stresses retained in the cement after the first pulse.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"28 1","pages":"101 - 110"},"PeriodicalIF":1.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the Structure, Phase Transformations, and Shape Memory Effect in Amorphous-Crystalline TiNiCu Alloy 非晶钛镍铜合金的结构、相变和形状记忆效应研究

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2025-02-12 DOI: 10.1134/S1029959924601155

A. V. Shelyakov, N. N. Sitnikov, D. A. Khachatrian, I. A. Zaletova

{"title":"Study of the Structure, Phase Transformations, and Shape Memory Effect in Amorphous-Crystalline TiNiCu Alloy","authors":"A. V. Shelyakov, N. N. Sitnikov, D. A. Khachatrian, I. A. Zaletova","doi":"10.1134/S1029959924601155","DOIUrl":"10.1134/S1029959924601155","url":null,"abstract":"Layered amorphous-crystalline TiNiCu alloy ribbons produced by ultrarapid quenching from the liquid state (melt spinning technique) show the two-way shape memory effect without additional processing, which makes them applicable to various micromechanical devices (microtweezers) for gripping and manipulating microobjects. The present work is devoted to the study of the influence of the rejuvenation process (cryogenic thermal cycling) and the thickness of the crystalline layer on the structure and functional properties of quasi-binary TiNi-TiCu alloy with the copper content 25 at %. It is shown that thickening of the crystalline layer significantly increases not only the enthalpy of martensitic transformation but also its critical temperatures and affects the alloy crystallization pattern and temperatures. Rejuvenation treatment transforms the interface between the amorphous and crystalline layers and changes the ratio between the B19 martensitic phase and the residual B2 austenitic phase in the martensitic state, which affects the martensitic transformation parameters. In addition, cryothermal treatment causes a noticeable increase in reversible strain (magnitude of the two-way shape memory effect) and significantly narrows the temperature hysteresis of shape changing, which can improve the functional properties of microdevices based on rapidly quenched amorphous-crystalline ribbons.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"28 1","pages":"111 - 122"},"PeriodicalIF":1.8,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143396737","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Retained Austenite Transformation and Portevin–Le Chatelier Effect in 44CrMn2Si2Mo Steel under Tension 44CrMn2Si2Mo钢拉伸后残余奥氏体相变及Portevin-Le Chatelier效应

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060043

S. I. Borisov, Yu. I. Borisova, E. S. Tkachev, S. M. Gaidar, R. O. Kaibyshev

{"title":"Retained Austenite Transformation and Portevin–Le Chatelier Effect in 44CrMn2Si2Mo Steel under Tension","authors":"S. I. Borisov, Yu. I. Borisova, E. S. Tkachev, S. M. Gaidar, R. O. Kaibyshev","doi":"10.1134/S1029959924060043","DOIUrl":"10.1134/S1029959924060043","url":null,"abstract":"The 44CrMn2Si2Mo steel heat treated by quenching and partitioning demonstrates a unique combination of strength characteristics: the yield stress σ0.2 = 1140 MPa, ultimate strength σВ = 1690 MPa, and elongation δ = 20.7%. Quenching and partitioning leads to the formation of a multiphase structure consisting of primary martensite, retained austenite, bainite, and secondary martensite. Primary martensite and bainite contain transition-metal carbides Fe2C. The high ductility of the steel is due to the transformation of retained austenite into strain-induced martensite during tension, which ensures high strain hardening. Stable plastic flow is observed at low strain, when a significant fraction of retained austenite is transformed into strain-induced martensite. The plastic flow instability, which appears as the Portevin–Le Chatelier effect on deformation curves and plastic flow localization in deformation bands, occurs at higher strains and is associated with the transformation of film-like retained austenite. The velocity of deformation bands decreases with a decrease in the volume fraction of retained austenite. Localization of plastic flow in the neck and fracture occur when the transformation of retained austenite into strain-induced martensite cannot provide strain hardening, and deformation bands lose their mobility.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"664 - 677"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radial Dependences of the Phase Composition, Nanohardness, and Young’s Modulus for Ti–2 wt % Fe Alloy after High-Pressure Torsion Ti-2 wt % Fe合金高压扭转后相组成、纳米硬度和杨氏模量的径向依赖性

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060018

A. S. Gornakova, S. I. Prokofjev, N. S. Afonikova, A. I. Tyurin, A. R. Kilmametov, A. V. Korneva, B. B. Straumal

{"title":"Radial Dependences of the Phase Composition, Nanohardness, and Young’s Modulus for Ti–2 wt % Fe Alloy after High-Pressure Torsion","authors":"A. S. Gornakova, S. I. Prokofjev, N. S. Afonikova, A. I. Tyurin, A. R. Kilmametov, A. V. Korneva, B. B. Straumal","doi":"10.1134/S1029959924060018","DOIUrl":"10.1134/S1029959924060018","url":null,"abstract":"The specimens of Ti–2 wt % Fe alloy were annealed at three different temperatures, in the β-Ti, α-Ti + β-Ti and α-Ti + TiFe fields of the Ti–Fe phase diagram, then water quenched and subjected to high-pressure torsion (HPT). The X-ray diffraction analysis showed that the main phase in all annealed specimens was the α phase (more than 90%), while the main phase after HPT was the ω phase. Hardness H and Young’s modulus E were determined by nanoindentation at the center, in the middle of the radius, and near the edge of each specimen. It was found that the H and E values were different for specimens annealed at different temperatures and depended on the radial coordinate of the indentation region. The maximum H values were obtained in the middle of the radius of the specimens. The E values of all specimens decreased from the center to the edge, reaching very low values. The paper discusses structure transformations during HPT, the behavior of the radial dependences of H and E, and probable causes of a strong decrease in E values.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"627 - 641"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical Properties and Fracture of Ultrafine-Grained Near β Titanium Alloy under Three-Point Bending 超细晶近β钛合金三点弯曲力学性能及断裂

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060109

E. V. Naydenkin, I. P. Mishin, I. V. Ratochka, B. B. Straumal, O. V. Zabudchenko, O. N. Lykova, A. I. Manisheva

引用次数: 0

Effect of Preliminary Deformation on the Formation of Ultrafine-Grained Structure during Equal Channel Angular Pressing of Magnesium Alloys 等径角挤压过程中预变形对镁合金超细晶组织形成的影响

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060055

A. V. Botkin, R. Z. Valiev, E. P. Volkova, G. D. Khudododova, R. Ebrahimi

引用次数: 0

Role of Nanosized Rotational Vortices in Cold Deformation of Metallic Glasses by the Example of Alloy Vit105 纳米旋转涡在金属玻璃冷变形中的作用——以Vit105合金为例

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060031

Vas. V. Astanin, E. A. Korznikova, D. V. Gunderov, V. V. Astanin, S. V. Dmitriev, J. Bhatt

{"title":"Role of Nanosized Rotational Vortices in Cold Deformation of Metallic Glasses by the Example of Alloy Vit105","authors":"Vas. V. Astanin, E. A. Korznikova, D. V. Gunderov, V. V. Astanin, S. V. Dmitriev, J. Bhatt","doi":"10.1134/S1029959924060031","DOIUrl":"10.1134/S1029959924060031","url":null,"abstract":"The experimental data on the deformation of amorphous alloy Vit105 (Zr52.5Cu17.9Al10Ni14.6Ti5) and its molecular dynamics simulation gave birth to new ideas about the mechanism of plastic deformation of disordered structures. A special method of torsion under hydrostatic pressure allows forming a developed deformation relief on the surface of polished specimens. Inspection of the relief points to the formation of shear bands on the surface, which can merge or branch, freely intersect or be arrested by an obstacle, forming a delta of small shear bands. Simulations based on the Morse pair potential made it possible to build a two-dimensional amorphous model and study its deformation at the atomic level. Under loading, material parts are displaced due to the appearance of atomic-scale vortices in the shear band layer by means of free volume, which is a structural feature of amorphous materials. A vortex causes redistribution of stress fields, which, when added to external stresses, are capable of activating similar vortices in the neighboring zones of the material, both in the direction of the applied stresses and along the vortex axis. In the latter case, a vortex tube is formed, which acts by the tornado mechanism. Shear is induced by the tube motion in the direction of principle shear stresses, and traces on the specimen surface are made by its screw component. An increase in the number of vortex tubes and their interaction causes a deformation band. Though playing the role of dislocations, vortex tubes are independent of specific crystalline planes and can move in arbitrary directions. This explains the experimentally observed features of deformation of amorphous alloys.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"653 - 663"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mathematical Modeling of Complex-Shape Forming of Ultrafine-Grained Ti Alloy and Subsequent Deposition of Protective High-Entropy Coatings 超细晶钛合金复杂形状成形及高熵防护涂层沉积的数学模型

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060092

R. R. Valiev, A. V. Oleinik, R. N. Asfandiyarov, A. Yu. Nazarov, K. N. Ramazanov, Ya. N. Savina, A. R. Kilmametov

{"title":"Mathematical Modeling of Complex-Shape Forming of Ultrafine-Grained Ti Alloy and Subsequent Deposition of Protective High-Entropy Coatings","authors":"R. R. Valiev, A. V. Oleinik, R. N. Asfandiyarov, A. Yu. Nazarov, K. N. Ramazanov, Ya. N. Savina, A. R. Kilmametov","doi":"10.1134/S1029959924060092","DOIUrl":"10.1134/S1029959924060092","url":null,"abstract":"The paper reports on finite element simulation of extrusion of a complex-shaped billet from the ultrafine-grained Ti-6Al-4V alloy and vacuum-arc deposition of a protective coating based on the TiVZrCrAl high-entropy alloy. Temperature fields formed in the billet during extrusion are studied. Deformation heating and the necessary forming force are determined for the initial temperature-rate conditions. The strain rate distribution in the billet during extrusion is also analyzed. According to the obtained data, the chosen temperature-rate conditions allow using the ultrafine-grained titanium alloy as the initial billet without deteriorating its mechanical characteristics. Computer simulation of the coating deposition on the complex-shaped billet provides values of the temperature, chemical composition, and thickness of the high-entropy coating. Thus, the coating thickness varies within 6.5–7.5 μm, and the surface is heated during deposition to 368–597°C, which allows maintaining the ultrafine-grained structure in the alloy.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"725 - 735"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Vanadium-Alloying on Microstructural Evolution and Strengthening Mechanisms of High-Nitrogen Steel Processed by High-Pressure Torsion 钒合金化对高压扭转高氮钢组织演变及强化机制的影响

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060110

E. G. Astafurova, G. G. Maier, S. V. Astafurov

{"title":"Effect of Vanadium-Alloying on Microstructural Evolution and Strengthening Mechanisms of High-Nitrogen Steel Processed by High-Pressure Torsion","authors":"E. G. Astafurova, G. G. Maier, S. V. Astafurov","doi":"10.1134/S1029959924060110","DOIUrl":"10.1134/S1029959924060110","url":null,"abstract":"We study the effect of high-pressure torsion on the microstructure, phase composition, microhardness, and strengthening mechanisms of high-nitrogen austenitic steels with different vanadium content: Fe-23Cr-19Mn-0.2C-0.5N, Fe-19Cr-21Mn-1.3V-0.3C-0.8N, and Fe-18Cr-23Mn-2.6V-0.3C-0.8N, wt %. Regardless of the chemical composition of the steels, high-pressure torsion (HPT) causes the refinement of their microstructure due to a high density of dislocations, twin boundaries, and shear bands. Vanadium alloying decreases the stacking fault probability in the structure of the steels and changes their dominating deformation mechanism under high-pressure torsion: from planar dislocation slip and twinning in the vanadium-free steel to dislocation slip with a tendency to shear band formation in the vanadium-alloyed steels. An increase in the vanadium content forces precipitation hardening. Thus, after HPT, the V-alloyed steels have a higher microhardness as compared to the vanadium-free one. Different strengthening factors (strain hardening, solid solution hardening, and precipitation strengthening) govern the value and kinetics of growth of microhardness of the steels processed by high-pressure torsion. Vanadium alloying and increasing its content result in the growth of the contribution of precipitation hardening and decreases strain hardening of high-nitrogen steels.","PeriodicalId":726,"journal":{"name":"Physical Mesomechanics","volume":"27 and Elena V. Bobruk","pages":"747 - 759"},"PeriodicalIF":1.8,"publicationDate":"2024-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1029959924060110.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of Twinning-Induced Plasticity Steel Processed by Multipass Equal Channel Angular Pressing at High Temperatures 高温多道次等径角压制孪晶塑性钢的性能

IF 1.8 4区材料科学

Physical Mesomechanics Pub Date : 2024-12-08 DOI: 10.1134/S1029959924060079

N. A. Enikeev, M. M. Abramova, I. V. Smirnov, A. M. Mavlyutov, J. G. Kim, C. S. Lee, H. S. Kim

引用次数: 0