Control of properties and structure of steel vessels by cooling in various media at the outlet of rolling and pressing lines

Metal Structure ◽

Machine Building ◽

Regression Equations ◽

Wide Range ◽

Industrial Mineral ◽

Cooling Media ◽

Technological Limitations ◽

When controlling the mechanical properties and structure of vessels made of carbon structural steels manufactured by hot deformation on rolling and pressing lines (PPL) of machine-building enterprises of Russia, such cooling media as water, I20 industrial mineral oil, air are used. The applied cooling media are able to provide the workpieces with a given structure with a wide range of mechanical properties. However, the cooling media have a number of technological limitations and conditions of the use, non-compliance with which leads to reject. When cooled in oil, the probability of ignition is high; when cooled in water, hardening cracks may form, and air is not always able to provide the required rate and uniformity of heat transfer to the environment. The efficiency of control of physical and mechanical properties and structure of deformed vessels made of 50 steel by cooling in TERMAT polymer aqueous solutions in different concentrations on PPL of the plant of JSC NPO Pribor was studied. The effect of varying the concentration from 2 to 9% of TERMAT polymer on the formation of metal structure, as well as physical and mechanical properties of hot-deformed vessels was studied. The results of testing the strength and plastic characteristics of vessels by destructive and non-destructive control methods are presented. According to the results of physical and mechanical properties, regression equations were obtained with at least 95% reliability of R2, which establish the relationship between the controlled plastic and strength parameters of the vessel metal`s properties. The conducted researches allowed to compare the indicators of the main physical and mechanical properties of steel vessels at the PPL outlet and to propose methods of inhomogeneity control that reduce time and material costs by 5–10% during the tests.

Forecasting Water Saturation of Fill Grounds in Urban Infrastructure Conditions by Mathematical Modeling Based on the Main Hydrophysical Characteristic

Journal of Environmental Management and Tourism ◽

10.14505//jemt.v9.3(27).08 ◽

2018 ◽

Vol 9 (3) ◽

pp. 485

Author(s):

Anna V. CHELOVECHKOVA ◽

Irina V. KOMISSAROVA ◽

Dmitry I. EREMIN

Keyword(s):

Mathematical Modeling ◽

Mechanical Properties ◽

Mathematical Model ◽

Granulometric Composition ◽

Water Saturation ◽

Urban Infrastructure ◽

Regression Equations ◽

Wide Range ◽

Software Product

A technique is proposed for forecasting water saturation of fill and undisturbed grounds used in construction when making a foundation. Dependencies are established between the content of individual granulometric fractions of grounds and their physico-mechanical properties. Reliable regression equations are obtained, which formed the basis of a mathematical model for predicting the water saturation of grounds. A software product has been developed, the work of which was tested using the example of the basic hydro-physical characteristics of the grounds differing in their properties (black earth and salt earth). The results obtained reliably prove the possibility of using the model and software product in a wide range of granulometric composition values and physical and mechanical properties of grounds.

Structure and properties of compact articles from high-alloyed iron powder with adding of boron nitride

Perspektivnye Materialy ◽

10.30791/1028-978x-2020-8-39-48 ◽

2020 ◽

pp. 39-48

Author(s):

B. O. Bolshakov ◽

◽

R. F. Galiakbarov ◽

A. M. Smyslov ◽

◽

...

Keyword(s):

Mechanical Properties ◽

Boron Nitride ◽

Grain Boundary ◽

Bending Strength ◽

Operating Conditions ◽

Structure And Properties ◽

Steam Turbines ◽

Friction Forces ◽

Wide Range

The results of the research of structure and properties of a composite compact from 13 Cr – 2 Мо and BN powders depending on the concentration of boron nitride are provided. It is shown that adding boron nitride in an amount of more than 2% by weight of the charge mixture leads to the formation of extended grain boundary porosity and finely dispersed BN layers in the structure, which provides a high level of wearing properties of the material. The effect of boron nitride concentration on physical and mechanical properties is determined. It was found that the introduction of a small amount of BN (up to 2 % by weight) into the compacts leads to an increase in plasticity, bending strength, and toughness by reducing the friction forces between the metal powder particles during pressing and a more complete grain boundary diffusion process during sintering. The formation of a regulated structure-phase composition of powder compacts of 13 Cr – 2 Mо – BN when the content of boron nitride changes in them allows us to provide the specified physical and mechanical properties in a wide range. The obtained results of studies of the physical and mechanical characteristics of the developed material allow us to reasonably choose the necessary composition of the powder compact for sealing structures of the flow part of steam turbines, depending on their operating conditions.

Fabrication and Characterization of Polylactic Acid Electrospun Scaffolds Modified with Multi-Walled Carbon Nanotubes and Hydroxyapatite Nanoparticles

Biomimetics ◽

10.3390/biomimetics5030043 ◽

2020 ◽

Vol 5 (3) ◽

pp. 43

Author(s):

Athanasios Kotrotsos ◽

Prokopis Yiallouros ◽

Vassilis Kostopoulos

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Polylactic Acid ◽

Polymeric Materials ◽

Cost Effective ◽

Electrospinning Process ◽

Wide Range ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

The solution electrospinning process (SEP) is a cost-effective technique in which a wide range of polymeric materials can be electrospun. Electrospun materials can also be easily modified during the solution preparation process (prior SEP). Based on this, the aim of the current work is the fabrication and nanomodification of scaffolds using SEP, and the investigation of their porosity and physical and mechanical properties. In this study, polylactic acid (PLA) was selected for scaffold fabrication, and further modified with multi-walled carbon nanotubes (MWCNTs) and hydroxyapatite (HAP) nanoparticles. After fabrication, porosity calculation and physical and mechanical characterization for all scaffold types were conducted. More precisely, the morphology of the fibers (in terms of fiber diameter), the surface properties (in terms of contact angle) and the mechanical properties under the tensile mode of the fabricated scaffolds have been investigated and further compared against pristine PLA scaffolds (without nanofillers). Finally, the scaffold with the optimal properties was proposed as the candidate material for potential future cell culturing.

Prosthodontic Applications of Polymethyl Methacrylate (PMMA): An Update

Polymers ◽

10.3390/polym12102299 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2299 ◽

Cited By ~ 1

Author(s):

Muhammad Sohail Zafar

Keyword(s):

Mechanical Properties ◽

Polymethyl Methacrylate ◽

Mechanical Reinforcement ◽

Occlusal Splints ◽

Dental Prostheses ◽

Wide Range ◽

Dental Applications ◽

Artificial Teeth ◽

Orthodontic Retainers

A wide range of polymers are commonly used for various applications in prosthodontics. Polymethyl methacrylate (PMMA) is commonly used for prosthetic dental applications, including the fabrication of artificial teeth, denture bases, dentures, obturators, orthodontic retainers, temporary or provisional crowns, and for the repair of dental prostheses. Additional dental applications of PMMA include occlusal splints, printed or milled casts, dies for treatment planning, and the embedding of tooth specimens for research purposes. The unique properties of PMMA, such as its low density, aesthetics, cost-effectiveness, ease of manipulation, and tailorable physical and mechanical properties, make it a suitable and popular biomaterial for these dental applications. To further improve the properties (thermal properties, water sorption, solubility, impact strength, flexural strength) of PMMA, several chemical modifications and mechanical reinforcement techniques using various types of fibers, nanoparticles, and nanotubes have been reported recently. The present article comprehensively reviews various aspects and properties of PMMA biomaterials, mainly for prosthodontic applications. In addition, recent updates and modifications to enhance the physical and mechanical properties of PMMA are also discussed.

Prediction Of Mechanical Properties

Hall-Petch and Multiple Linear Regression Equations for the Prediction of Mechanical Properties in Gamma-Based Titanium Aluminides

MRS Proceedings ◽

10.1557/proc-460-183 ◽

1996 ◽

Vol 460 ◽

Author(s):

W. O. Soboyejo ◽

A. B. O. Soboyejo ◽

Y. Ni ◽

C. Mercer

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Linear Regression ◽

Multiple Linear Regression ◽

Titanium Aluminides ◽

Regression Equations ◽

Combined Effects ◽

Wide Range ◽

Elongation To Failure ◽

In a recent paper, Mercer and Soboyejo [1] demonstrated the Hall-Petch dependence of basic room- and elevated-temperature (815°C) mechanical properties (0.2% offset strength), ultimate tensile strength, plastic elongation to failure and fracture toughness) on the average equiaxed/lamellar grain size. Simple Hall-Petch behavior was shown to occur in a wide range of extruded duplex α2-γ alloys (Ti-48A1, Ti-48Al-1.4Mn Ti-48Al-2Mn and Ti-48Al-1.5Cr). As in steels and other materials [2–5], simple Hall-Petch equations with were derived for the above properties [1]. However, the Hall-Petch equations did not include the effect of other variables that can affect to the basic mechanical properties of gamma alloys. Multiple linear regression equations for the prediction of the combined effects of several (alloying, microstructure and temperature) variables on basic mechanical properties temperature are presented in this paper.

RESULTS OF MULTIVARIATE EXPERIMENT TO DETERMINE DEPENDENCE OF THE MAXIMUM PRESSURE OF TRACTOR WHEELS ON THE SOIL FROM TRACTOR’S PARAMETERS AND PHYSICAL AND MECHANICAL PROPERTIES OF SOIL. STATISTICAL ANALYSIS

Vestnik of Kazan state agrarin university ◽

10.12737/article_592fc87eb749c3.30587578 ◽

2017 ◽

pp. 94-98

Author(s):

Хафизов ◽

Kamil Khafizov ◽

Хафизов ◽

Ramil Khafizov

Keyword(s):

Mechanical Properties ◽

Similarity Theory ◽

Experimental Studies ◽

Similarity Criterion ◽

Statistical Processing ◽

Multiple Correlation Coefficient ◽

Similarity Criteria ◽

Maximum Pressure ◽

Regression Equations

A similarity criteria were reveled to determine the dependence of maximum pressure of the tractor wheel on the soil on the basis of the use of similarity theory. Each similarity criterion includes several parameters, characterizing the tractor, its propeller and physical and mechanical properties of the soil. The similarity criteria is taken as factors in the multivariate experiment. Multifactorial experimental studies were planned and carried out. We used Statistics Toolbox subsystem of Matlab computer mathematics system for processing the results of experiments. As a result of statistical processing of the experimental data by the equation we obtained a dependence of maximum pressure of the tractor wheel on the soil from tractor parameters, and physical and mechanical properties of the soil. Statistical data on the equations, such as - multiple correlation coefficient, Fisher’s criterion, Student’s criterion, indicate the significance of equations of the experiments variants, as well as the significance of the coefficients of the regression equations.

Testing of the physical and mechanical properties of cast iron with the help of IFMH-C device

Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY) ◽

10.21122/1683-6065-2019-3-65-69 ◽

2019 ◽

pp. 65-69

Author(s):

A. P. Kren ◽

V. A. Rudnitsky ◽

G. A. Lantsman ◽

M. N. Delendik ◽

N. V. Zinkevich ◽

...

Keyword(s):

Mechanical Properties ◽

Cast Iron ◽

Spheroidal Graphite ◽

Applied Physics ◽

National Academy Of Sciences ◽

Cast Irons ◽

Academy Of Sciences ◽

Manufacturing Environments ◽

The possibility of the application of impact microindentation method for testing the physic and mechanical properties of cast iron using the IFMH-C instrument developed at the Institute of applied physics of the National Academy of Sciences of Belarus was tested. It was established that the method and the instrument allow to estimate such parameters as Brinell hardness in the range of 100–500 HB, elastic modulus from 40 to 200 MPa, as well as to determine the tensile strength of the flake and spheroidal graphite cast irons. The possibility of using the instrument for non-destructive test directly of parts and products in the manufacturing environments is shown.

Experimental research of dependence between informative parameters NDT techniques and steel physical and mechanical properties

Oil and Gas Power Engineering ◽

10.31471/1993-9868-2018-2(30)-44-48 ◽

2018 ◽

pp. 44-48

Author(s):

N. I. Chaban

Keyword(s):

Mechanical Properties ◽

Experimental Studies ◽

Ultrasonic Field ◽

Failure Detectors ◽

Metal Structures ◽

New Methods ◽

Informative Parameters ◽

Research of new methods and technologies of non-destructive control of change of long-term metal structures is an actual task of the present. In this article the methodology and results of experimental studies, the main aim of which is to determine the correlation between the intensity of structural noise in the material determined by failure detectors based on ultrasonic field-induced phase grating and the physical and mechanical properties of steels are presented.

Analysis of efficiency of drilling equipment use in mining operations

E3S Web of Conferences ◽

10.1051/e3sconf/202131502018 ◽

2021 ◽

Vol 315 ◽

pp. 02018

Author(s):

Yuriy Masaev ◽

Vladislav Masaev ◽

Yuriy Drozdenko

Keyword(s):

Mechanical Properties ◽

Energy Intensity ◽

Structural Features ◽

Ore Deposits ◽

Mining Operations ◽

Drilling Equipment ◽

Wide Range ◽

Mine Workings ◽

Underground Method

When developing coal and ore deposits by underground method, it is necessary to carry out a large volume of preparatory mine workings using drilling and blasting operations. Minerals are found in rocks under various conditions and their physical and mechanical properties change in a wide range. Under such conditions, it is necessary to use drilling machines this different to the principle of action and structural features. The article considers geometric parameters of roc cutters, peculiarities of drilling modes, affecting energy intensity and drilling productivity in rocks with different strength coefficient.

Application of a portable indentation rig with Rockwell indenter to determine mechanical properties and residual stresses on an aluminum plate

The Journal of Strain Analysis for Engineering Design ◽

10.1177/0309324720921289 ◽

2020 ◽

Vol 55 (7-8) ◽

pp. 246-257

Author(s):

Saba Salmani Ghanbari ◽

Amir-Hossein Mahmoudi

Keyword(s):

Mechanical Properties ◽

Residual Stresses ◽

Structural Integrity ◽

Indentation Load ◽

Instrumented Indentation ◽

Unknown Parameters ◽

Plastic Properties ◽

Wide Range ◽

Portable Apparatus ◽

Measuring residual stresses is still a dilemma in many engineering applications. It is even more crucial when the industrial requirements demand for a non-destructive technique in order to avoid compromising the structural integrity of the engineering components. Furthermore, estimating the mechanical properties of the materials, especially when the components are aged, is of importance. Instrumented indentation has gained much interest in recent years. There are many studies in the literature which are focused on measuring residual stresses or mechanical properties using instrumented indentation. Since in many cases there is no possibility of transferring large samples or those under service, for possible measurements, having a portable rig can be very useful. Furthermore, indentation procedure is a low-cost non-destructive method with high accuracy which is able to measure the plastic properties of material as well as its residual stresses on which the designing and construction of the portable apparatus were based. The instrumented indentation testing details were followed according to the ASTM E2546-15 standard practice. In this research, a wide range of simulations were performed on a group of aluminum alloys in order to estimate the equi-biaxial residual stresses by analyzing the indentation load–displacement curves which were obtained from the experimental outcomes. Then neural networks were employed to estimate the unknown parameters. The performance accuracy of the designed portable apparatus and the acceptable precision of the introduced method were then verified with experimental tests performed on Al 2024-T351.