Numerical modeling and experimental studies for shape and dimensional control in the curing process of textile composites

2007 ◽  
Vol 81 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Enrico D’Amato
Keyword(s):  
Numerical Modeling ◽  
Experimental Studies ◽  
Textile Composites ◽  
Curing Process ◽  
Dimensional Control

Numerical modeling and experimental studies of light pulse propagation in inhomogeneous random media

1993 ◽  
Author(s):  
Sten Madsen ◽  
Michael S. Patterson ◽  
Brian C. Wilson ◽  
Satish M. Jaywant ◽  
Andreas Othonos
Keyword(s):  
Numerical Modeling ◽  
Light Pulse ◽  
Random Media ◽  
Pulse Propagation ◽  
Experimental Studies

scholarly journals ANALYSIS OF RHEOLOGICAL MODELS OF PROCESS OF SELF-FORMING OF GLUED WOODEN

2020 ◽  
Vol 16 (2) ◽  
pp. 94-100
Author(s):  
Vladislav Ponomarev ◽  
Galina Kashevarova
Keyword(s):  
Plastic Deformation ◽  
Numerical Modeling ◽  
Moisture Content ◽  
Rheological Model ◽  
Experimental Studies ◽  
Rheological Models ◽  
Model Experiments ◽  
Promising Technology ◽  
Expansion Coefficients ◽  
Elastic And Plastic Deformation

The article considers a promising technology for self-shaping glued wooden elements of curved forms. This method is based on rheological processes occurring in wood, such as dehumidification and swelling of wood and its anisotropic properties. To predict the final curved shape of the wooden structure, the authors analyzed existing rheological models of wood and concluded that the rheological model proposed by European researchers includes the most complete list of factors that affect the process of deformation of wood: elastic and plastic deformation, drying and swelling of wood, deformation of viscous-elastic creep and mechanical sorption deformation. Based on the results of experimental studies and numerical modeling of the change in the curvature of glued wooden elements, which were made by European researchers, it was found that the proposed rheological model of wood needs to be clarified, namely, the correction of hygro-expansion coefficients depending on the moisture content of wood. A further direction of the authors’ research will be aimed at conducting model experiments to determine the hygro-expansion coefficients of different grades of wood depending on the thickness of the wooden elements and the orientation of the layers in the glued structure.

scholarly journals THE ANALISIS OF MERCURY EMISSIONS FROM «USOLYEKHIMPROM» INDUSTRIAL SITE

2021 ◽  
Vol 4 (1) ◽  
pp. 193-198
Author(s):  
Vladimir F. Raputa ◽  
Ruslana A. Amikishieva ◽  
Tatyana V. Yaroslavtseva
Keyword(s):  
Numerical Modeling ◽  
Numerical Analysis ◽  
Experimental Studies ◽  
Mercury Vapor ◽  
Soil Survey ◽  
Industrial Site ◽  
Mercury Emissions ◽  
Long Period ◽  
Light Impurities ◽  
Reconstruction Model

The numerical analysis of mercury pollution in the vicinity of the “Usoliekhimprom" industrial site and a territory of Usolye-Sibirskoye was held. The main centers of atmospheric influx of mercury vapor, which are located in the area of the sludge storage and the former mercury electrolysis workshop, were determined by the results of the soil survey. Asymptotic descriptions of the processes of transfer of light impurities from ground-based sources, taking into account the relative position of foci and observation points, were proposed. A reconstruction model of concentration fields over a long period of time for the dominant sources of plant was developed. The model was tested on biomonitoring data for 2019. Quite satisfactory agreement between the data of experimental studies of the content of mercury in poplar leaves with the results of numerical modeling was obtained. The ratios of contributions to pollution from different objects of the enterprise were calculated. Recommendations on the use of the reconstruction model to control rehabilitation measures at the Usoliekhimprom industrial site, which are currently being carried out, have been proposed.

scholarly journals A semi-analytical decomposition analysis of surface plasmon generation and the optimal nanoledge plasmonic device

RSC Advances ◽  
2016 ◽  
Vol 6 (21) ◽  
pp. 17196-17203 ◽  
Author(s):  
Zheng Zeng ◽  
Madu N. Mendis ◽  
David H. Waldeck ◽  
Jianjun Wei
Keyword(s):  
Numerical Modeling ◽  
Surface Plasmon ◽  
Experimental Studies ◽  
Decomposition Analysis ◽  
Optical Performance ◽  
Analytical Analysis ◽  
Plasmonic Device

A semi-analytical analysis of a nanoledged plasmonic device for optimal optical performance, validated with numerical modeling and experimental studies.

A modern approach to the design of foreign landing parachute systems

2020 ◽  
Author(s):  
S.Yu. Ploskov
Keyword(s):  
Numerical Modeling ◽  
Vortex Formation ◽  
Experimental Studies ◽  
Modern Approach ◽  
Parachute System ◽  
Parachute Canopy ◽  
Payload Mass ◽  
The Stability ◽  
Definition Of ◽  
Expanded Concept

Landing parachute systems are among the most demanded samples of parachute equipment. The purpose of the study was to find new principles for developing parachutes with increased stability according to the analysis of the results of numerical and experimental studies of canopies of various shapes. The paper proposes to supplement a traditional definition of the stability of a parachute system with the obligatory consideration of the system’s ability to maintain a given trajectory of movement with a neutral canopy, regardless of the change in the payload mass. It is the expanded concept of stability that is taken as the basis of the modern approach to the design of foreign landing parachute systems. The study substantiates the main criteria for choosing the optimal cutting shape for parachute systems of increased stability of various types at the stage of preliminary design. The results of numerical modeling of canopies are presented: quarter-spherical, hemispherical, polyconic canopies and a T-11 type parachute canopy. Based on the analysis of these results, the study was first to propose a hypothesis that a decrease in the intensity of vortex formation in the wake leads to an increase in the stability of the parachute descent. The results of numerical modeling of canopies of various shapes, as well as experimental studies of a model polyconic parachute, which prove the correctness of the proposed hypothesis, are presented.

MULTIPHASE SPRAY COOLING OF STEEL PLATES NEAR THE LEIDENFROST TEMPERATURE — EXPERIMENTAL STUDIES AND NUMERICAL MODELING

2010 ◽  
Vol 20 (5) ◽  
pp. 387-405 ◽  
Author(s):  
Nedim Sozbir ◽  
C. Yigit ◽  
R. J. Issa ◽  
Shi-Chune Yao ◽  
H. R. Guven ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Experimental Studies ◽  
Spray Cooling ◽  
Steel Plates ◽  
Leidenfrost Temperature

scholarly journals Plastic Shaping of Concentrator-Waveguide Tip for Ultrasound Endovascular Ablation

2021 ◽  
Vol 20 (2) ◽  
pp. 101-108
Author(s):  
Wenqi Dai ◽  
Yu. G. Aliakseyeu ◽  
A. Yu. Korolyov ◽  
A. S. Budnitskiy
Keyword(s):  
Numerical Modeling ◽  
Experimental Studies ◽  
The Finite Element Method ◽  
Forming Process ◽  
Preliminary Calculation ◽  
Cavitation Effect ◽  
Distribution Process ◽  
Conical Section ◽  
Vibration Impact ◽  
Plastic Shaping

One of the most effective methods of treating intravascular formations at present is the use of stepped ultrasonic waveguide systems of a tubular type (concentrators-waveguides) with a hollow spherical tip, the presence of which makesit possible to supply liquid media to the dislocation zone of an intravascular formation with the aim of additional cavitation effect and as efficiently as possible. destroy intravascular formations due to vibration impact. Based on the results of the analysis on the features of the existing shaping methods for obtaining a hollow spherical tip of the concentrator-waveguide, it is advisable to use methods of plastic deformation – expansion and crimping. The paper presents results of preliminary calculations, numerical modeling and experimental studies of tip shaping processes of the concentrator-waveguide by distribution and crimping. On the basis of the finite element method in the environment of the ABAQUS software package, modeling of the expansion and crimping of a pipe billet was carried out, which has made it possible to: evaluate the stress-strain state of the deformable conical section of the billet, the change in wall thickness during the forming process and calculate the length of the billet for the design of the conical section; to establish the patterns of the influence of geometric parameters on the power modes of the distribution process; to set the parameters of the modes of forming the tip of the concentrator-waveguide by the method of distribution and crimping, which ensure the formation of the required geometry. The obtained results of preliminary calculation, numerical modeling and experimental studies of tip shaping processes of the concentrator-waveguide by distribution and crimping have similar values, which confirms the correctness of using both the method of preliminary calculation and numerical modeling in the development of the technology for manufacturing the concentrator-waveguide.

scholarly journals Methods for studying the parameters of the formation of a backfilling mass of open pit cavities from metallurgical slags

2021 ◽  
Vol 64 ◽  
pp. 81-98
Author(s):  
O Filonenko ◽  
M Petlovanyi
Keyword(s):  
Numerical Modeling ◽  
Physical Properties ◽  
Practical Implication ◽  
Experimental Studies ◽  
Stable State ◽  
Atmospheric Precipitation ◽  
Open Pit ◽  
The Finite Element Method ◽  
Steel Making ◽  
Metallurgical Slags

Purpose. Development of a methodological algorithm for performing analytical and experimental studies to substantiate rational parameters for the formation of a filling mass from metallurgical slags in worked-out opencast cavities. Methodology. The use of the physical modeling method to study the degree of permeability of atmospheric precipitation into the filling massif and determine its key physical properties, considering the criteria for the similarity of nature and the model, was proposed and substantiated. The use of numerical modeling by the finite element method for predicting deformations of the filling mass and achieving its stable state has been substantiated. Results.Theoretical aspects of the order of formation of a stable filling mass for various types of metallurgical slags under the action of a load, the layers of which are characterized by different physical properties, are presented. To form the height of the bottom sealed filling layer from steel-making slag in conditions of the degree of permeability of atmospheric precipitation and the formation of filtrate it is proposed. The characteristics of the physical model of the filling mass and the maximum amount of precipitation, which will affect its surface, have been determined. The key physical properties of the main layers of the backfill massif (voidness, bulk density, compaction coefficient) and methods of their determination for the formation of its stable state are highlighted. The features of the numerical modeling of the deformations of the filling mass based on the Drucker-Prager strength model for bulk materials in the SolidWorks software package have been determined. Original. The scientific and methodological foundations for the formation of a safe and stable filling array of opencast cavities based on metallurgical slags have been created. Practical implication. A methodological algorithm has been developed that makes it possible to determine the parameters of the formation of a filling mass with the subsequent restoration of natural landscapes and to dispose of significant volumes of safe industrial waste in quarry cavities.

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