Pub Date : 2023-09-28DOI: 10.36236/1999-7590-2023-15-3-205-214
I.D. Petukhov, A. A. Kolchin, V.Yu. Malyshev, O. Shakhlevich, N. Prokopenko, S. Mileiko
Fabrication, microstructure and some mechanical properties of a laminated composite containing titanium layers and those of Ti-Ti2Ni eutectic, the latter being an intermediate matrix for carbon fibre are described in the present paper. In particular, it is shown that strength characteristics of the composite allows considering it as a possible structural material.
{"title":"LAMINATED TITANIUM-MATRIX COMPOSITE","authors":"I.D. Petukhov, A. A. Kolchin, V.Yu. Malyshev, O. Shakhlevich, N. Prokopenko, S. Mileiko","doi":"10.36236/1999-7590-2023-15-3-205-214","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-3-205-214","url":null,"abstract":"Fabrication, microstructure and some mechanical properties of a laminated composite containing titanium layers and those of Ti-Ti2Ni eutectic, the latter being an intermediate matrix for carbon fibre are described in the present paper. In particular, it is shown that strength characteristics of the composite allows considering it as a possible structural material.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-20DOI: 10.36236/1999-7590-2023-15-3-151-161
S.B. Sapozhnikov, M. Semashko, A.Yu. Kletneva
In this work, the kinetics of the curing of fabric GFRP was carried out by measuring the parameters of its electrical conductivity. A compound of epoxy resin (ED-20), plasticizer (DBF) and hardener (PEPA) with the addition of finely milled graphite (FMG) was used as a matrix. To en-sure high-quality mixing of FMG in epoxy resin, a planetary mixer was used. Plain weave glass tape 0.2 mm thick with two woven wires was impregnated with a matrix compound. This tape was placed onto a beam 4 mm thick made of typical GFRP as an external electrically conductive functional sensor (FS). During curing at room temperature, periodic measurements of the electrical conductivity of the FS and the stiffness of the beam with FS in three-point bending were carried out. The amount of FMG into the matrix compound was below the percolation threshold; there-fore, electrical measurements of FS required alternating current. The dependence of the imped-ance on the current frequency (from 10 Hz to 1 MHz) was recorded. Comparison of the change in FS electrical impedance with the change in the beam stiffness during the curing showed their close correlation. The proposed method of measuring the FS impedance can be used to assess the degree of curing of the polymer matrix in critical large-sized composite products during the manufacturing process.
{"title":"EVALUATION OF THE CURING KINETICS OF A POLYMER MATRIX COMPOSITE USING A SENSOR CONTAINING AN ELECTRICALLY CONDUCTIVE FILLER","authors":"S.B. Sapozhnikov, M. Semashko, A.Yu. Kletneva","doi":"10.36236/1999-7590-2023-15-3-151-161","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-3-151-161","url":null,"abstract":"In this work, the kinetics of the curing of fabric GFRP was carried out by measuring the parameters of its electrical conductivity. A compound of epoxy resin (ED-20), plasticizer (DBF) and hardener (PEPA) with the addition of finely milled graphite (FMG) was used as a matrix. To en-sure high-quality mixing of FMG in epoxy resin, a planetary mixer was used. Plain weave glass tape 0.2 mm thick with two woven wires was impregnated with a matrix compound. This tape was placed onto a beam 4 mm thick made of typical GFRP as an external electrically conductive functional sensor (FS). During curing at room temperature, periodic measurements of the electrical conductivity of the FS and the stiffness of the beam with FS in three-point bending were carried out. The amount of FMG into the matrix compound was below the percolation threshold; there-fore, electrical measurements of FS required alternating current. The dependence of the imped-ance on the current frequency (from 10 Hz to 1 MHz) was recorded. Comparison of the change in FS electrical impedance with the change in the beam stiffness during the curing showed their close correlation. The proposed method of measuring the FS impedance can be used to assess the degree of curing of the polymer matrix in critical large-sized composite products during the manufacturing process.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139338634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-18DOI: 10.36236/1999-7590-2023-15-3-170-204
A. V. Khokhlov, A. Okhlopkova, S. A. Sleptsova, A.V. Babaytsev, N. Lazareva, P. Tarasova, O. S. Votinova, A. A. Ushkanov, A. V. Shaporev, V. V. Gulin
This is the first (introductory) article in a series of articles devoted to a comprehensive experimental study and modeling of the viscoelastoplastic properties of polytetrafluoroethylene and a number of composites with increased wear resistance based on it, obtained in recent years in the laboratories “Technology of Polymer Nanocomposites” and “Polymer Composites for the North” of the Ammosov North-Eastern Federal University by introducing layered silicates (mechanically activated kaolin and serpentine, magnesium spinel) and short basalt or carbon fibers as fillers. Data from quasi-static tensile tests of these materials under different loading programs are presented: a family of stress-strain curves (until failure) at different strain rates, loading and unloading curves at different strain rates, creep and recovery curves for different stress levels, etc. The basic scalar characteristics of materials are determined (instantaneous modulus, yield strength, stress and strain at failure depending on the loading rate, etc.), the influence of the composition and proportion of fillers on them, and their strain rate sensitivity are analyzed. After mechanical tests, changes in the microstructure of PTFE and composites with different filler contents in the destruction zones of the samples were studied using a scanning electron microscope. An initial analysis of the volume of test data accumulated over 2 years revealed high deformability of materials, pronounced hereditary properties, the ability of materials to creep (flow) under constant load and accumulate irreversible (plastic) deformation, very high strain rate sensitivity, a strong influence of small amounts of fillers on the structure and mechanical properties. A more detailed presentation of the entire volume of test data and effects found, a systematic study of the viscoelastoplastic properties of these materials with different filler contents and their detailed comparative analysis as well as detection of connection with wear resistance are the topics of subsequent articles in the series in 2023-2025.
{"title":"STUDY ON THE VISCOELASTOPLASTIC PROPERTIES OF POLYTETRAFLUOROETHYLENE AND NANOCOMPOSITES WITH INCREASED WEAR RESISTANCE BASED ON IT. PART 1. MATERIALS, TEST PROGRAMS AND BASIC PROPERTIES","authors":"A. V. Khokhlov, A. Okhlopkova, S. A. Sleptsova, A.V. Babaytsev, N. Lazareva, P. Tarasova, O. S. Votinova, A. A. Ushkanov, A. V. Shaporev, V. V. Gulin","doi":"10.36236/1999-7590-2023-15-3-170-204","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-3-170-204","url":null,"abstract":"This is the first (introductory) article in a series of articles devoted to a comprehensive experimental study and modeling of the viscoelastoplastic properties of polytetrafluoroethylene and a number of composites with increased wear resistance based on it, obtained in recent years in the laboratories “Technology of Polymer Nanocomposites” and “Polymer Composites for the North” of the Ammosov North-Eastern Federal University by introducing layered silicates (mechanically activated kaolin and serpentine, magnesium spinel) and short basalt or carbon fibers as fillers. Data from quasi-static tensile tests of these materials under different loading programs are presented: a family of stress-strain curves (until failure) at different strain rates, loading and unloading curves at different strain rates, creep and recovery curves for different stress levels, etc. The basic scalar characteristics of materials are determined (instantaneous modulus, yield strength, stress and strain at failure depending on the loading rate, etc.), the influence of the composition and proportion of fillers on them, and their strain rate sensitivity are analyzed. After mechanical tests, changes in the microstructure of PTFE and composites with different filler contents in the destruction zones of the samples were studied using a scanning electron microscope. An initial analysis of the volume of test data accumulated over 2 years revealed high deformability of materials, pronounced hereditary properties, the ability of materials to creep (flow) under constant load and accumulate irreversible (plastic) deformation, very high strain rate sensitivity, a strong influence of small amounts of fillers on the structure and mechanical properties. A more detailed presentation of the entire volume of test data and effects found, a systematic study of the viscoelastoplastic properties of these materials with different filler contents and their detailed comparative analysis as well as detection of connection with wear resistance are the topics of subsequent articles in the series in 2023-2025.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139339166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-14DOI: 10.36236/1999-7590-2023-15-3-162-169
N. V. Titov, А.V. Kolomeichenko, P. Bazhin, А.М. Stolin
The article presents the results of a study of the microstructure of composite cermet coatings formed by carbovibro-arc hardening using multicomponent pastes containing tungsten carbide as a hardening component. It is shown that the composite cermet coatings obtained using this paste have a two-layer structure. The X-ray phase analysis and scanning electron microscopy reveals the strengthening phases characteristic of the main and transition zones of the coatings. The distribution of chemical elements in the cross section of the coatings confirmed their high adhesion strength.
{"title":"FEATURES OF THE MICROSTRUCTURE OF COMPOSITE CERMET COATINGS FORMED BY CARBO-VIBROARC HARDENING USING MULTICOMPONENT PASTES CONTAINING TUNGSTEN CARBIDE","authors":"N. V. Titov, А.V. Kolomeichenko, P. Bazhin, А.М. Stolin","doi":"10.36236/1999-7590-2023-15-3-162-169","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-3-162-169","url":null,"abstract":"The article presents the results of a study of the microstructure of composite cermet coatings formed by carbovibro-arc hardening using multicomponent pastes containing tungsten carbide as a hardening component. It is shown that the composite cermet coatings obtained using this paste have a two-layer structure. The X-ray phase analysis and scanning electron microscopy reveals the strengthening phases characteristic of the main and transition zones of the coatings. The distribution of chemical elements in the cross section of the coatings confirmed their high adhesion strength.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"155 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139340068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-18DOI: 10.36236/1999-7590-2023-15-2-129-139
O. Averichev, A. Stolin, N. Lazareva, P. A. Stolin, А. Okhlopkova
In the current work a solid-phase technology of composite materials based on polytetrafluoroethylene (PTFE) with functional additives is investigated. The mentioned additives are titanium carbides and diborides was obtained by self-propagating high-temperature synthesis (SHS). The process of pressing bulk density composite powders into compact blanks in a special mold by loading in a constant speed mode has been studied. Rheological strainstress curves were obtained. The time when a progressive increasing of stress inside the sample was determined. The results of these studies were compared with data for samples without additives (pure PTFE), as well as for compositions with basalt fiber. It is shown that at stresses 171-177 MPa it is possible to achieve a density corresponding to the calculated compact density of 2.24-2.25 g/cm3. The dependence of density variation over the volume of compact specimens has been studied, and a comparative analysis of the compressibility moduli G under uniaxial cold pressing has been carried out.
{"title":"COLD UNIAXIAL PRESSING OF COMOSITE MATERIALS BASED ON PTFE WITH FUNCTIONAL\u0000ADDITIVES TIC AND TIB2","authors":"O. Averichev, A. Stolin, N. Lazareva, P. A. Stolin, А. Okhlopkova","doi":"10.36236/1999-7590-2023-15-2-129-139","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-2-129-139","url":null,"abstract":"In the current work a solid-phase technology of composite materials based on polytetrafluoroethylene (PTFE) with functional additives is investigated. The mentioned additives are titanium carbides and diborides was obtained by self-propagating high-temperature synthesis (SHS). The process of pressing bulk density composite powders\u0000into compact blanks in a special mold by loading in a constant speed mode has been studied. Rheological strainstress curves were obtained. The time when a progressive increasing of stress inside the sample was determined. The results of these studies were compared with data for samples without additives (pure PTFE), as well as for compositions with basalt fiber. It is shown that at stresses 171-177 MPa it is possible to achieve a density corresponding to the calculated compact density of 2.24-2.25 g/cm3. The dependence of density variation over the volume of compact specimens has been studied, and a comparative analysis of the compressibility moduli G\u0000under uniaxial cold pressing has been carried out.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114644536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-12DOI: 10.36236/1999-7590-2023-15-2-116-128
S. Lurie, G. Kriven
The paper investigates the effective properties of compact bone tissue under shear loading along the central axis of the Haversian canal. Compact bone tissue is considered as a structure consisting of an osteon (haversian canal, lamellae, cementing line) and interstitial tissue. To assess the effective longitudinal properties of bone tissue, a three-stage homogenization procedure based on the Reiss method and the three-phase method is used. The numerical values of the effective modulus of longitudinal shear obtained in the proposed work are in good agreement with the numerical values of the longitudinal shear obtained by other authors as a result of experimental studies.
{"title":"STUDY OF THE EFFECTIVE PROPERTIES OF COMPACT BONE TISSUES","authors":"S. Lurie, G. Kriven","doi":"10.36236/1999-7590-2023-15-2-116-128","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-2-116-128","url":null,"abstract":"The paper investigates the effective properties of compact bone tissue under shear loading along the central axis of the Haversian canal. Compact bone tissue is considered as a structure consisting of an osteon (haversian canal, lamellae, cementing line) and interstitial tissue. To assess the effective longitudinal properties of bone tissue, a three-stage homogenization procedure based on the Reiss method and the three-phase method is used. The numerical values of the effective modulus of longitudinal shear obtained in the proposed work are in good agreement with the numerical values of the longitudinal shear obtained by other authors as a result of experimental studies.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124065653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-18DOI: 10.36236/1999-7590-2023-15-2-109-115
L. R. Vishnyakov, I. A. Gushchin
General approaches to solving the problem of lightning protection of composite materials are considered. In particular, the use of dielectric composites, which are radio transparent, requires the organization of their reliable lightning protection, which involves the use of conductors. Thus, the development of segment tires creates the prerequisites for realizing the advantages of knitted combined weaves, including metal threads, and requires further research.
{"title":"PRINCIPLES OF THE CHOICE OF THE COMBINED LIGHTNING PROTECTION FOR COMPOSITE MATERIALS OF DIELECTRIC POLYMERS","authors":"L. R. Vishnyakov, I. A. Gushchin","doi":"10.36236/1999-7590-2023-15-2-109-115","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-2-109-115","url":null,"abstract":"General approaches to solving the problem of lightning protection of composite materials are considered. In particular, the use of dielectric composites, which are radio transparent, requires the organization of their reliable lightning protection, which involves the use of conductors. Thus, the development of segment tires creates the prerequisites for realizing the advantages of knitted combined weaves, including metal threads, and requires\u0000further research.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127358464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-28DOI: 10.36236/1999-7590-2023-15-2-95-108
M. Yapryntsev, M. Ozerov
Composite materials Bi2Te2.7Se0.3 /Teδ with varying concentration (δ = 0.15; 0.2; 0.25 and 0.3) were obtained by solvothermal synthesis of the initial powders and their subsequent spark plasma sintering. During the sintering process, the samples are textured, as a result of which the lamellar grains are arranged in layers perpendicular to the direction of pressure application during sintering (the direction of the texture axis). At magnification, the concentration of over-stoichiometry tellurium decreases the degree of texturing. The concentration of tellurium does not affect the average grain size. Super-stoichiometric tellurium is distributed along the grain boundaries, as a result of which a structure characteristic of composite materials is formed. The release of tellurium at the grain boundaries leads to a change in the thermoelectric properties of the obtained materials. The electrical resistivity naturally increases, and the total thermal conductivity decreases with an increase in the concentration of overstoichiometry tellurium.
{"title":"SYNTHESIS, MICROSTRUCTURE AND THERMOELECTRIC PROPERTIES OF COMPOSITE\u0000MATERIAL Bi2Te2.7Se0.3Teδ OBTAINED FROM ASYMMETRIC","authors":"M. Yapryntsev, M. Ozerov","doi":"10.36236/1999-7590-2023-15-2-95-108","DOIUrl":"https://doi.org/10.36236/1999-7590-2023-15-2-95-108","url":null,"abstract":"Composite materials Bi2Te2.7Se0.3 /Teδ with varying concentration (δ = 0.15; 0.2; 0.25 and 0.3) were obtained by solvothermal synthesis of the initial powders and their subsequent spark plasma sintering. During the sintering process, the samples are textured, as a result of which the lamellar grains are arranged in layers perpendicular to the direction of pressure application during sintering (the direction of the texture axis). At magnification, the concentration of over-stoichiometry tellurium decreases the degree of texturing. The concentration of tellurium does not affect the average grain size. Super-stoichiometric tellurium is distributed along the grain boundaries, as a result of which a structure characteristic of composite materials is formed. The release of tellurium at the grain boundaries leads to a change in the thermoelectric properties of the obtained materials. The electrical resistivity naturally increases, and the total thermal conductivity decreases with an increase in the concentration of overstoichiometry\u0000tellurium.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"2009 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127327049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.36236/1999-7590-2022-14-4-233-245
Г.А. Форенталь, Сергей Борисович Сапожников
In this paper, felting is considered as a needle-punch technology for joining layered preform made from dry plain weave fabrics (XY plane) by breaking and pulling down some of the fibers in the Z-axis. After impregnation of the preform and curing of the polymeric matrix, the pulled fibers strengthen the composite in the Z-direction. Experimental studies were carried out to determine the relationship between the number and length of Z-fibers versus the density of felting (number of needle punches per 1 cm2). It is shown that for a room curing epoxy matrix, the length of Z-fibers is greater than the critical one, which made it possible to obtain an increase in the Mode I crack energy release rate (GIC) by 40% for a minimum density of felting of 10 cm-2. Based on the stress state FEM analysis at the tip of a crack (DCB-specimen), it is shown that the layered fabric composite transverse strength after felting increases significantly, which makes it possible to recommend this 3D-reinforcement technology for use in aerospace applications in areas subjected to random local impacts. В данной работе фелтинг рассматривается как иглопробивная технология для связывания слоёв преформы из сухих тканей гладкого плетения (плоскость XY) за счёт разрыва и вытяжки части волокон по направлению Z. После пропитки преформы и отверждения полимерного связующего вытянутые волокна обеспечивают упрочнение композита в направлении Z. В работе проведены экспериментальные исследования количества и длины Z-волокон от плотности фелтинга (количества ударов игл на 1 см2). Экспериментально показано, что для эпоксидного связующего холодного отверждения длина Z-волокон больше критической, что позволило получить увеличение критической энергии развития трещины нормального отрыва на 40% для минимальной плотности фелтинга 10 см-2. На базе МКЭ-анализа напряжённого состояния в вершине трещины нормального отрыва (образец – двойная консольная балка) показано, что трансверсальная прочность слоистого тканевого композита после фелтинга существенно возрастает, что позволяет рекомендовать данную технологию локального трёхмерного армирования для использования в аэрокосмических приложениях в областях, подверженных случайным локальным ударам.
{"title":"ПЕРСПЕКТИВЫ ТЕХНОЛОГИИ ФЕЛТИНГА ДЛЯ ЛОКАЛЬНОГО ТРЁХМЕРНОГО АРМИРОВАНИЯ ПОЛИМЕРНЫХ ТКАНЕВЫХ КОМПОЗИТОВ\u0000\u0000PROSPECTS OF FELTING TECHNOLOGY FOR LOCAL 3D-REINFORCEMENT OF POLYMER FABRIC COMPOSITES","authors":"Г.А. Форенталь, Сергей Борисович Сапожников","doi":"10.36236/1999-7590-2022-14-4-233-245","DOIUrl":"https://doi.org/10.36236/1999-7590-2022-14-4-233-245","url":null,"abstract":"In this paper, felting is considered as a needle-punch technology for joining layered preform made from dry plain weave fabrics (XY plane) by breaking and pulling down some of the fibers in the Z-axis. After impregnation of the preform and curing of the polymeric matrix, the pulled fibers strengthen the composite in the Z-direction.\u0000Experimental studies were carried out to determine the relationship between the number and length of Z-fibers versus the density of felting (number of needle punches per 1 cm2). It is shown that for a room curing epoxy matrix, the length of Z-fibers is greater than the critical one, which made it possible to obtain an increase in the Mode I crack energy release rate (GIC) by 40% for a minimum density of felting of 10 cm-2. Based on the stress state FEM analysis at the tip of a crack (DCB-specimen), it is shown that the layered fabric composite transverse strength after felting increases significantly, which makes it possible to recommend this 3D-reinforcement technology for use in aerospace applications in areas subjected to random local impacts.\u0000\u0000В данной работе фелтинг рассматривается как иглопробивная технология для связывания слоёв преформы из сухих тканей гладкого плетения (плоскость XY) за счёт разрыва и вытяжки части волокон по направлению Z. После пропитки преформы и отверждения полимерного связующего вытянутые волокна обеспечивают упрочнение композита в направлении Z. В работе проведены экспериментальные исследования количества и длины Z-волокон от плотности фелтинга (количества ударов игл на 1 см2). Экспериментально показано, что для эпоксидного связующего холодного отверждения длина Z-волокон больше критической, что позволило получить увеличение критической энергии развития трещины нормального отрыва на 40% для минимальной плотности фелтинга 10 см-2. На базе МКЭ-анализа напряжённого состояния в вершине трещины нормального отрыва (образец – двойная консольная балка) показано, что трансверсальная прочность слоистого тканевого композита после фелтинга существенно возрастает, что позволяет рекомендовать данную технологию локального трёхмерного армирования для использования в аэрокосмических приложениях в областях, подверженных случайным локальным ударам.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123072034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-10DOI: 10.36236/1999-7590-2022-14-4-192-200
Т.Т. Хачатрян, Р.М. Акобян, Э.А. Акобян, С. Г. Григорян, В. О. Топузян
Sorption properties of polyaniline (PANI) have been investigated. It has been found that maximum amount of adsorbed glycerin by PANI reaches 78 wt.%, and material remaining as dry powder of black color. Nicotine (NCT) release in aerosol mixture with glycerin (GLY) from samples of PANI containing nicotine and 64-78 wt.% of glycerin was determined in test bench trial in 1l/min airstream at 2000C of heating. TG-MS and DSC analysis data showed that in the case of a sample with 64 wt.% % glycerin, less energy is required to desorb the glycerin + nicotine mixture than in the other two cases with bigger amount of glycerin. Hybrid PANI-SiO2 nanocomposites were synthesized and tested. In regard to glycerin sorption they are significantly inferior to PANI. Исследованы сорбционные свойства полианилина (ПАНИ). Установлено, что максимальное количество адсорбированного глицерина полианилином достигает 78 масс. %, а материал остается в виде сухого по- рошка черного цвета. Высвобождение никотина аэрозольной смесью глицерина из образцов ПАНИ, со- держащих никотин и 64-78 масс % глицерина определяли в испытаниях на стенде в потоке воздуха скоростью 1 л/мин при температуре 2000C. Данные ТГ-МС и ДСК анализа показали, что в случае образца с 64 масс. % глицерина для десорбции смеси глицерин + никотин требуется меньше энергии, чем в двух других случаях с большим количеством глицерина. Синтезированы и исследованы гибридные нанокомпозиты ПАНИ-SiO2. По сорбции глицерина они значительно уступают ПАНИ.
{"title":"Polyaniline based composite sorbents as carriers and delivery systems of biologically active substances\u0000\u0000Сорбенты на основе композитов полианилина в качестве носителей и систем доставки биологически активных соединений","authors":"Т.Т. Хачатрян, Р.М. Акобян, Э.А. Акобян, С. Г. Григорян, В. О. Топузян","doi":"10.36236/1999-7590-2022-14-4-192-200","DOIUrl":"https://doi.org/10.36236/1999-7590-2022-14-4-192-200","url":null,"abstract":"Sorption properties of polyaniline (PANI) have been investigated. It has been found that maximum amount of adsorbed glycerin by PANI reaches 78 wt.%, and material remaining as dry powder of black color. Nicotine (NCT)\u0000release in aerosol mixture with glycerin (GLY) from samples of PANI containing nicotine and 64-78 wt.% of glycerin was determined in test bench trial in 1l/min airstream at 2000C of heating.\u0000TG-MS and DSC analysis data showed that in the case of a sample with 64 wt.% % glycerin, less energy is required to desorb the glycerin + nicotine mixture than in the other two cases with bigger amount of glycerin. Hybrid PANI-SiO2 nanocomposites were synthesized and tested. In regard to glycerin sorption they are significantly\u0000inferior to PANI.\u0000\u0000Исследованы сорбционные свойства полианилина (ПАНИ). Установлено, что максимальное количество\u0000адсорбированного глицерина полианилином достигает 78 масс. %, а материал остается в виде сухого по-\u0000рошка черного цвета. Высвобождение никотина аэрозольной смесью глицерина из образцов ПАНИ, со-\u0000держащих никотин и 64-78 масс % глицерина определяли в испытаниях на стенде в потоке воздуха скоростью 1 л/мин при температуре 2000C.\u0000Данные ТГ-МС и ДСК анализа показали, что в случае образца с 64 масс. % глицерина для десорбции смеси глицерин + никотин требуется меньше энергии, чем в двух других случаях с большим количеством глицерина. Синтезированы и исследованы гибридные нанокомпозиты ПАНИ-SiO2. По сорбции глицерина они значительно уступают ПАНИ.","PeriodicalId":317637,"journal":{"name":"COMPOSITES and NANOSTRUCTURES","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127660570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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