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Dynamic response and plastic deformation behavior of Ti–5Al–2.5Sn ELI and Ti–8Al–1Mo–1V alloys under high-strain rate

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Rare Metals 2014年第2期33卷 127-133页

作者： Yan-Ling Wang Song-Xiao Hui Rui Liu Wen-Jun Ye Yang Yu Ravil kayumov State Key Laboratory for Fabrication & Processing of Nonferrous Metals General Research Institute for Nonferrous Metals Department of Mechanical Engineering Sun Moon University

Split Hopkinson pressure bar test system was used to investigate the plastic deformation behavior and dynamic response character of a-type Ti–5Al–2.5Sn ELI and near a-type Ti–8Al–1Mo–1V titanium alloy when subjected to dynamic loading. In the present work, stress–strain curves at strain rate from 1.5 9 103to 5.0 9 103s-1were analyzed, and optical microscope（OM） was used to reveal adiabatic shearing behavior of recovered samples. Results show that both the two alloys manifest significant strain hardening effects. Critical damage strain rate of the two alloys is about 4.3 9 103s-1, under which the impact absorbs energy of Ti–5Al–2.5Sn ELI and Ti–8Al–1Mo–1V are 560 and 470 MJ m-3, respectively. Both of them fracture along the maximum shearing strength orientation, an angle of 45° to the compression axis. No adiabatic shear band（ASB） is found in Ti–5Al–2.5Sn ELI alloy, whereas several ASBs with different widths exist without regular direction in Ti–8Al–1Mo–1V alloy.

关键词： Titanium alloy Ti–5Al–2.5Sn ELI Ti–8Al– 1Mo–1V High-strain rate Adiabatic shear band

The Study of the Movement of Cotton Particles and Mathematical Modeling of the Impact of It at the Ginning Point

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Engineering（科研） 2019年第11期11卷 768-776页

作者： Jamoliddin Ergashev Khamid Akhmedhodjaev Abdusamat Karimov Juramirza kayumov Rashida Ergasheva Namangan Institute of Engineering and Technology Namangan Uzbekistan

This article studied the principles of movements in the horizontal part of the newly constructed ginning camera, which is created by the authors, of the cotton particles. During the movement, the cotton particles get affected by pressing to various surface and forceful turbulent and horizontal movements of the surface. Some foreign mixtures and additional unnecessary objects get separated by the turbulence of the various surfaces and movement of the paneled stripes. Ginning efficiency and the quality of the cotton will be improved as the defects of the cotton particles are removed. “Cotton particle + net surface” movement principle of the Cartesian coordinate system was examined based on the rows of Cartesian coordinate system, by dividing all sides of the system by m weight and has the following second ordered multiple gender differential formula.

关键词： Cotton Particle Ginning Process Ginning Camera Saw Cylinder Belt Conveyor Plank

Analysis of Vibrations of Roller of the Polymer Composite Coating Equipment on Stitches of Tarpaulin Materials

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Engineering（科研） 2023年第10期15卷 709-719页

作者： Shavkat Behbudov Anvar Djurayev Juramirza kayumov Urinboy Kuryozov Mehrinur Samadova Department of Technological Machines and Equipment Bukhara Institute of Engineering and Technology Bukhata Uzbekistan Department of Automation and Control of Technological Processes and Manufacturing Tashkent Institute of Textile and Light Industry Tashkent Uzbekistan Department of Textile Engineering Zhejiang Sci-Tech University Hangzhou China Department of Technology of Goods of Textile Industry Namangan Institute of Textile Industry Namangan Uzbekistan

The article presents a structural diagram and the principle of operation of the installation of a sewing machine for applying a polymer composition to the stitch lines of tarpaulin materials. The calculation schemes and the mathematical model of oscillations of the axis of the composite roller during the application of the polymer composition along the lines of tarpaulin materials are presented. Based on the numerical solution of the problem, the regularities of roller oscillations are presented. The main parameters of the system are substantiated.

关键词： Sewing Machine Device Roller Polymer Composition Vibration Rigidity

Antibiofilm and antithrombotic hydrogel coating based on superhydrophilic zwitterionic carboxymethyl chitosan for blood-contacting devices

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Bioactive Materials 2024年第4期34卷 112-124页

作者： Dong Uk Lee Mukhammad kayumov Junghun Park Se Kye Park Yeongkwon Kang Yejin Ahn Woojin Kim Seung Hwa Yoo Jun-Kyu Park Bong-Gi Kim Yong Suk Oh In-Seok Jeong Dong Yun Choi Biomedical Manufacturing Technology Center Korea Institute of Industrial TechnologyYeongcheon38822Republic of Korea Department of Thoracic and Cardiovascular Surgery Chonnam National University Hospital and Medical SchoolGwangju61469Republic of Korea Research Institute of Advanced Materials Seoul National UniversitySeoul08826Republic of Korea Department of Organic and Nano System Engineering Konkuk UniversitySeoul05029Republic of Korea Department of Quantum System Engineering Jeonbuk National UniversityJeonju-si54896Republic of Korea IMT Inc. Gwangju61086Republic of Korea Department of Mechanical Engineering Changwon National UniversityChangwon51140Republic of Korea

Blood-contacting devices must be designed to minimize the risk of bloodstream-associated infections,thrombosis,and intimal lesions caused by surface ***,achieving effective prevention of both bloodstream-associated infections and thrombosis poses a challenge due to the conflicting nature of antibacterial and antithrombotic activities,specifically regarding electrostatic *** study introduced a novel biocompatible hydrogel of sodium alginate and zwitterionic carboxymethyl chitosan(ZW@CMC)with antibacterial and antithrombotic activities for use in *** ZW@CMC hydrogel demonstrates a superhydrophilic surface and good hygroscopic properties,which facilitate the formation of a stable hydration layer with low *** zwitterionic-functionalized CMC incorporates an additional negative sulfone group and increased negative charge density in the carboxyl *** augmentation enhances electrostatic repulsion and facilitates the formation of hydration *** leads to exceptional prevention of blood clotting factor adhesion and inhibition of biofilm ***,the ZW@CMC hydrogel exhibited biocompatibility with tests of in vitro cytotoxicity,hemolysis,and catheter ***,in vivo tests of antithrombotic and systemic inflammation models with catheterization indicated that ZW@CMC has significant advantages for practical applications in cardiovascular-related and sepsis *** study opens a new avenue for the development of chitosan-based multifunctional hydrogel for applications in blood-contacting devices.

关键词： Zwitterionic Hydrogel Blood-clotting Antimicrobial Sepsis

Studying the Law of the Movement of Cotton Particle on a Saw Cylinder and the Interaction with Saw Teeth

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Engineering（科研） 2019年第10期11卷 717-725页

作者： Jamoliddin Ergashev Khamid Akhmedhodjaev Abdusamat Karimov Juramirza kayumov Rashida Ergasheva Shohruxmirzo Mahsudov Namangan Institute of Engineering and Technology Namangan Uzbekistan

This article investigates the movement trajectory of the cotton particle from Point D of belt transporter of the saw gin camera to Point B of the saw cylinder. In other words, the forces acting on the cotton particle and the equations of their interactions are developed, where, the differential equation of the law of movement of the cotton particle “belt + saw” is made according to the d’Alembert principle. Arc-BD of cotton particle gives the length of the arc of their fall on the saw teeth. The maximum separation of fibers and the quality of separation of fiber from seeds, as well as the time (t) of rapid separation of fiber from seeds, depend on the length of the arc-BD, because the critical length of the arc-BD makes it possible to reduce the multi-layering of the falling cotton particle on the saw teeth. In this scientific research work, patented by the new working camera of the saw gin, the trajectories of the movement of the cotton particles along the arc-DB, as well as the trajectory of the move in the direction of the grate are studied. The results of the study show that the number of fibers increases along the height of the teeth of the saw with one touch. This leads to a decrease in the average stay of seeds in the working chamber of the gin. As a result, the efficiency of the saw gin is increased.

关键词： Cotton Particle Belt Conveyor Saw Cylinder Grate Cotton Seeds Cotton Fiber Net Surface

An Experimental Investigation to Examine the Wicking Properties of Silk Fabrics

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Journal of Textile Science and Technology 2019年第4期5卷 108-124页

作者： Md Kamrul Hasan Juramirza kayumov Guocheng Zhu Munna Khatun Asaduzzaman Nur Xinbo Ding School of Materials and Textile Zhejiang Sci-Tech University Hangzhou China

In this research, the wicking characteristics of fabrics were used as an essential and effective indicator to investigate the satisfaction of heat and moisture. Due to the popularization of silk fabrics recently it has become an interesting topic to know about the wicking behavior of silk fabrics in water. The absorptive capability of the silk textile makes clothing comfortable even for a hotter environment. Silk fabrics are comfortable in the summer, and warm in the winter. Silk fabric can usually contain about 11 percent of its weight in moisture but the range varies from 10% to as much as 30%. In this paper, the wicking behavior of silk fabric in both warp and weft directions was investigated in terms of wicking height, wicking rate, mass increase distribution per centimeter of wicking height, the velocity of wicking height, and durability of wicking height after removal of the wicking liquid reservoir. The experimental results show that the wicking height in both the warp and weft directions had a good correlation with the time. The wicking rate was comparable in both weft and warp directions, but at the start of the wicking phase, weft direction wicking was quicker than warp direction. The mass increase in fabric per centimeter of wicking height was inversely proportional to wicking height. The mass of moisture carried in the fabric did not significantly differ in the direction of the weft and warp.

关键词： Silk Fabric Wicking Behavior Warp and Weft Direction Rate of Wicking Velocity of Wicking Durative Wicking Height Contact Angle

Theoretical Optimization of the Production of Heating Layers Using Local Wool Fibers

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Engineering（科研） 2022年第12期14卷 578-590页

作者： Matluba Abdurashid Kizi Nazarova Juramirza Abdiramatovich kayumov Axtam Akramovich Qosimov abdulrasul Abdumajitovich Mahmudov Department of “Construction and Technology of Light Industrial Products” Namangan Institute of Engineering and Technology Namangan Uzbekistan Department of Textile Engineering Zhejiang Sci-Tech University Hangzhou China Department of Technology of Goods of Textile Industry Namangan Institute of Engineering and Technology Namangan Uz-bekistan Department of “Metrology Standardization and Quality Management” Namangan Institute of Engineering and Technology Namangan Uzbekistan Department of General Technics Fergana Polytechnics Institute Fergana Uzbekistan

Science is the basis of the country’s development and wealth. In particular, it is necessary to effectively use advanced scientific developments and technical achievements in order to strengthen the economy in the period when the desire for innovation in all fields is still growing. In theoretical-experimental Scientific Research work, both theoretical and experimental results are achieved, and it is more useful to withstand more theoretical-experimental loads for a longer period of time. The occurrences in the production process of natural wool fiber technologists are a complex of physical and mechanical phenomena, which can be used only by the modern achievements of science and technology. In most cases, the parameter relationship with the factors influencing the technological process or the object can open a curve without any other things.

关键词： Wool Polyester Fiber Content Heating Layer Surface Density Result Unwanted Factors Chemical Fiber Experiments Heat Storage Determine

Study of Cotton Seeds as a Processing Material

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Engineering（科研） 2023年第11期15卷 782-791页

作者： Akhmedxodjayev Khamit Tursunovich Tadjibayev Muhammad Ahmadjanovich Sharipov Khayrullo No’monjanovich Juramirza Abdiramatovich kayumov Abduraximov Komiljon Karimovich Namangan Institute of Engineering and Technology Namangan Uzbekistan

The purpose of this research is to improve the qualitative and quantitative indicators of fiber, lint and seeds by improving the technology of preparing cotton seeds for processing. The state of the seeds after the gin was studied and their division into fractions according to the degree of pubescence was recommended, the probabilities of the seeds emerging from the gin with varying degrees of pubescence were investigated, the geometric sizes and shapes of cotton seeds were studied. It has been established that when seeds come out of gin, they have different pubescence. The conditional movement of seeds without separation from the surface has been determined;found a formula describing the movement of seeds without detaching from the surface;the movement of seeds in a micro-flight is determined;the sizes of the cells of the mesh surface were determined as a function of d_c, α and on the speed of seed movement. The aim of the research work is to increase the yield of cotton fiber by improving the processing technology of germinated seeds, to improve the quality indicators of seeds and lint. In order to achieve this goal, a mesh surface device was created to sort the seeds into fractions. Sorting technology was developed on this device and operating modes were determined. In addition, the law of surface distribution of the fractions separated from the cotton stream moving along the surface of the net was determined, and based on the results of practical and theoretical research, a mode of sorting of cotton seeds was developed.

关键词： Fiber Lint Raw Cotton Ginning Saw Gin Working Chamber Raw Grate Linting Cotton Seeds

Mathematical Modeling of the Bulk Density Property of Knitted Fabrics

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Engineering（科研） 2022年第1期14卷 33-42页

作者： Iroda Ibrohimovna Kamalova Baxtiyor Farruxovich Mirusmanov Juramirza Abdiramatovich kayumov Axtam Akramovich Qosimov Muborak Nosir Qizi Yusupova Department of “Design” Namangan Institute of Engineering and Technology Namangan Uzbekistan Department of “Textile Fabric Technology” Tashkent Institute of Textile and Light Industry Tashkent Uzbekistan Department of Textile Engineering Zhejiang Sci-Tech University Hangzhou China Department of Metrology Standardization and Quality Management Namangan Institute of Engineering and Technology Namangan Uzbekistan Department of Technology of Goods of Textile Industry Namangan Institute of Engineering and Technology Namangan Uzbekistan

The paper focuses on the prediction of the volumetric density property of knitting fabrics using mathematical modeling. Based on the graphical analysis of the obtained mathematical models, the results of the raw mater... 详细信息

关键词： Knitwear Futer Polyester Mathematical Model Input Parameter Output Parameter Regression Coefficient