Browsing by Author "Karahan, Mehmet"
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Item Ballistic impact behavior of the aramid and ultra-high molecular weight polyethylene composites(Sage Publications, 2015-01) Jabbar, Abdul; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200This paper presents the experimental study of fiber type, fabric structure, orientation of fabric plies and thickness on the ballistic impact behavior of aramid and ultra-high molecular weight polyethylene (UHMWPE) composite laminates. Aramid composite laminates are reinforced by three kinds of fabric structures and UHMWPE composite laminates are reinforced by two kinds of fabric structures. The laminates are fabricated via autoclave curing process. The ballistic behavior of composite laminates is evaluated by ballistic limit velocity, and energy absorbed at ballistic limit. Through a series of ballistic tests, it is demonstrated that unidirectional composite laminates exhibit higher ballistic limit velocity and energy absorption on unit weight basis compared to other laminates. Interesting results are shown by UD-UHMWPE-H62 (R) and UD-UHMWPE-Endumax (R) fabric-reinforced laminates. Orientation of fabric plies is found to have insignificant effect on ballistic behavior irrespective of material type. A bi-linear relationship is found between the ballistic limit velocity, energy absorption and specimen thickness.Item Blast performance of demining footwear: Numerical and experimental trials on frangible leg model and injury modeling(Amer Soc Testing Maretials, 2018-03) Karahan, Emir Ali; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200TBThis study reveals the protective efficacy of a personal protective boot against mine blasts, both experimentally and numerically. By employing analyses conducted with the use of different amounts of explosives, the protective efficacy of the developed boot is compared to a typical military boot as reference. Both for analysis and verification tests, a ballistic gelatin covered frangible leg model was used. Strain energy that is exerted on the leg was determined with numerical analyses and verified with data obtained from strain gauges that were placed on the leg model. By employing the dynamic finite-element method, the physical injury that occurred to the leg model was examined and compared with the results of the blast test. The Type 2 boot decreased the strain energy by approximately 80 % compared with the Type 1 boot. This observation was also verified with measurements obtained from strain-gauge sensors placed along the tibia. It was observed that the damage occurring on the tibia was limited to local injuries and concentrated at a single spot without causing any fractures with the Type 2 boot. As a result of axial load, the leg with the Type 1 boot demonstrated fractures at several points rather than a fracture at a single point based on deflection. Hence, the latter case yields irremediable injuries.Item Blast performance of demining footwear: Numerical and experimental trials on frangible leg model and injury modeling(Springer, 2018) Ahram, T.; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200This study reveals the protective efficacy of a personal protective boot against mine blasts both experimentally and numerically. By employing analyses conducted with the use of different amounts of explosives, the protective efficacy of the developed boot is compared to a typical military boot as reference. Both for analysis and verification tests, a ballistic gelatin covered frangible leg model was used. Strain energy that is exerted on the leg was determined with numerical analyses and verified with data obtained from strain gauges that were placed on the leg model. By employing the dynamic finite elements method, the physical injury that occurred to the leg model was examined and compared with the results of the blast test. The type-2 boot decreased the strain energy by approximately 80% compared with the type-1 boot. This observation was also verified with measurements obtained from strain gauge sensors placed along the tibia bone. It was observed that the damage occurring on the tibia bone was limited to local injuries and concentrated at a single spot without causing any fractures with the type-2 boot. As a result of axial load, the leg with the type-1 boot demonstrated fractures at several points rather than a fracture at a single point based on deflection. Hence, the latter case yields irremediable injuries.Item A comparative study of tensile properties of non-crimp 3D orthogonal weave and multi-layer plain weave E-glass composites. Part 1: Materials, methods and principal results(Elsevier Science, 2009-08) Lomov, Stepan V.; Bogdanovich, Alexander E.; Ivanov, Dmitry S.; Mungalov, Dmitri; Verpoest, Ignaas; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500Composites fabricated by VARTM technology with the use of single-ply non-crimp 3D orthogonal woven preforms 3WEAVE (R) find fast growing research interest and industrial applications. It is now well understood and appreciated that this type of advanced composites provides efficient delamination suppression, enhanced damage tolerance, and superior impact, ballistic and blast performance characteristics over 2D fabric laminates. At the same time, this type of composites, having practically straight in-plane fibers, show significantly better in-plane stiffness and strength properties than respective properties of a "conventional" type 3D interlock weave composites. One primarily important question, which has not been addressed yet, is how the in-plane elastic and strength characteristics of this type of composites compare with respective in-plane properties of "equivalent" laminates made of 2D woven fabrics. This 2-part paper presents a comprehensive experimental study of the comparison of in-plane tensile properties of two single-ply non-crimp 3D orthogonal weave E-glass fiber composites on one side and a laminate reinforced with four plies of plain weave E-glass fabric on the other. Results obtained from mechanical testing are supplemented by acoustic emission data providing damage initiation thresholds, progressive cracks observation, full-field surface strain mapping and cracks observation on micrographs. The obtained results demonstrate that the studied 3D non-crimp orthogonal woven composites have considerably higher in-plane ultimate failure stresses and strains, as well as damage initiation strain thresholds than their 2D woven laminated composite counterpart. Part I presents the description of materials used, experimental techniques applied, principal results and their mutual comparisons for the three tested composites. Part 2 describes in detail the experimentally observed effects and trends with the main focus on the progressive damage: detailed results of AE registration, full-field strain measurements and progressive damage observations, highlighting peculiarities of local damage patterns and explaining the succession of local damage events, which leads to the differences in strength values between 2D and 3D composites.Item A comparative study of tensile properties of non-crimp 3D orthogonal weave and multi-layer plain weave E-glass composites. Part 2: Comprehensive experimental results(Elsevier Science, 2009-08) Ivanov, Dmitry S.; Lomov, Stepan V.; Bogdanovich, Alexander E.; Verpoest, Ignaas; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500This Part 2 paper presents results of comparative experimental study of progressive damage in 2D and 3D woven glass/epoxy composites under in-plane tensile loading. As Part 1, this Part 2 work is focused on the comparison of in-plane tensile properties of two non-crimp single-ply 3D orthogonal weave E-glass fibre composites on one side and a laminate reinforced with four plies of E-glass plain weave on the other. The damage investigation methodology combines mechanical testing with acoustic emission registration (that provides damage initiation thresholds), progressive cracks observation on transparent samples, full-field surface strain mapping and cracks observation on micrographs, altogether enabling for a thorough characterisation of the local micro- and meso-damage modes of the studied composites. The obtained results demonstrate that the non-crimp 3D orthogonal woven composites have significantly higher in-plane strengths, failure strains and damage initiation thresholds than their 2D woven laminated counterpart. The growth of transverse cracks in the yarns of 3D composites is delayed, and they are less prone to a yarn-matrix interfacial crack formation and propagation. Delaminations developing between the plies of plain weave fabric in the laminate at certain load level never appear in the 3D woven single-ply composites. (C) 2009 Elsevier Ltd. All rights reserved.Item Comparison of ballistic performance and energy absorption capabilities of woven and unidirectional aramid fabrics(Sage Publications, 2008-08) Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Tekstil,Giyim, Ayakkabı ve Deri Bölümü.; AAK-4298-2021; 8649952500This study investigated and compared the performance of ballistic protection panels formed with 100% woven and 100% unidirectional nonwoven para-aramid fabrics at different fabric ply numbers. For this purpose, Twaron CT 710 type woven para-aramid fabric panels and K-Flex unidirectional nonwoven para-aramid fabric panels (which were formed by using Kevlar 129 yarns) of different ply numbers were subjected to ballistic tests according to NIJ standards. Ballistic performance of the test samples was determined by measuring trauma depth and trauma diameter. The energy absorbed by fabric layers and the energy transmitted to the back of fabric layers were calculated from trauma depth and trauma diameter values. It was shown that the unidirectional fabric panels absorbed around 12.5-16.5% more energy than woven fabric panels for the unit panel weight.Item Comparison of heald frame motion generated by rotary dobby and crank & cam shedding motions(Inst Chemical Fibres, 2005) Eren, Recep; Özkan, Gülcan; Karahan, Mehmet; Uludağ Üniversitesi/Mühendislik Mimarlık Fakültesi/Tekstil Mühendisliği Bölümü.; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Tekstil Programı.; AAK-4298-2021; 55999849700; 57197680261; 8649952500Mechanism models are introduced for rotary dobby, crank & cam shedding motions. Equations governing heald frame motion are derived. Heald frame motion curves are obtained and compared with each other. It is shown that higher heald frame maximum velocity & maximum acceleration, as well as a longer approximate heald frame dwell, are generated by the rotary dobby rather than the crank or cam shedding motions, due to the intermittent nature of the rotary dobby shaft motion.Item Compressibility of carbon woven fabrics with carbon nanotubes/nanofibres grown on the fibres(Elsevier, 2011-02-07) Lomov, Stepan V.; Gorbatikh, Larissa; Kotanjac, Zeljko; Koissin, Vitaly; Houlle, Matthieu; Rochez, Olivier; Mezzo, Luca; Verpoest, Ignaas; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500Growth of carbon nanotubes (CNT) or carbon nano-fibres (CNF) on carbon fibrous substrates is a way to increase the fracture toughness of fibre reinforced composites (FRC), with encouraging results reported in the recent years. If these nano-engineered FRC (nFRC) are destined to leave laboratories and enter industrial-scale production, a question of adapting the existing composite manufacturing methods will arise. The paper studies compressibility of woven carbon fibre performs (two types of fabrics) with CNT/CNF grown on the fibres using the CVD method. The results include pressure vs thickness and pressure vs fibre volume fraction diagrams for one and four layers of the fabric. Morphology of the nFRC is studied with SEM. It is shown that the pressure needed to achieve the target fibre volume fraction of the preform increases drastically (for example, from 0.05 MPa to more than 0.5 MPa for a fibre volume fraction of 52%) when CNT/CNF are grown on it. No change in nesting of the fabric plies is noticed. The poor compressibility can lower the achievable fibre volume fraction in composite for economical vacuum assisted light-RTM techniques and increase the pressure requirements in autoclave processing.Item Compressibility of CNT-grafted fibrous reinforcements: A theory(Springer, 2010-04) Lomov, Stepan Vladimirovitch; Koissin, Vitaly; Godara, Ajay; Gorbatikh, Larissa; Verpoest, I.; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500The paper introduces a theoretical model of compressibility of a nanotube forest with randomly oriented nanotubes, which is applied to predict compressibility of a fibrous reinforcement with CNT-grafted fibres. It is shown that the pressure needed to achieve the target fibre volume fraction of the perform increases drastically when CNT are present in the preform. This can lower the achievable fibre volume fraction for economical vacuum assisted light-RTM manufacturing techniques and increase the pressure requirements in autoclave processing. The modelling is complemented with experimental investigation of compressibility of woven carbon performs with CNT grown on the carbon twill 2/2 fabric using CVD method.Item Development and characterization of hybrid green composites from textile waste(Springer, 2018) Masood, Zaid; Nawab, Yasir; Trzcielinski, S.; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200The current study focused on the use of textile industry waste (cotton and jute) and glass fabric for the development of hybrid composites. Composites were fabricated using either a single reinforcement or different fractions of cotton, jute and glass fabric. A good fibre-matrix interface was observed using Scanning Electronic Microscopy (SEM). The mechanical performance of the developed composites was analyzed under certain loads. The tensile and flexural properties of the composites developed from waste material was found lower as compared to the glass fiber composites, while hybrid composites had comparable properties. Regression equations were also developed to predict the mechanical properties of the hybrid composites. The results revealed that, after some pre-treatment (mercerization and desizing) textile waste materials can be used with virgin material in reinforcement part of composite to decrease the cost but with optimum mechanical properties. This usage of textile waste will be helpful for its value addition and solving the waste disposal problems.Item Development of an innovative sandwich composite material for protection of lower limb against landmine explosion: Mechanical leg test results(Sage Puplications, 2017-01) Karahan, Emir Ali; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500This paper includes results of the blast tests which were performed with the aim of comparing the energy absorption and protection efficiency of protective boots with different sole configurations. Tests were performed on a mechanical leg model vestured with protective boots. Load and three axis acceleration values were measured during the blast tests to determine the protection efficiency of boot samples. Herewith, it was understood that merely a monolithic composite layer used in a sole does not provide protection, whereas compressible metallic honeycomb material-based sandwich composites demonstrate better energy absorption. With the innovative sandwich composite material developed in this study, energy absorption was increased by 209% in comparison to monolithic composites.Item Development of an innovative sandwich composites for the protection of lower limbs against landmine explosions(Sage Publications, 2016-12) Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200This article includes the results of blast tests that were performed with the aim of comparing the energy absorption and protection efficiencies of protective boots with different sole configurations. The tests were performed using a frangible leg model vestured with protective boots. Strain values were measured during the blast tests to determine the protection efficiencies of different sole configurations of the protective boots. Filling honeycomb cells with glass microspheres dramatically increased the energy absorption. In the type-3 samples, which were produced with these microspheres, the strain through the tibia axis decreased 83-47% for different explosive weights compared with the type-1 samples and 52-13% for different explosive weights compared with the type-2 samples; the type-1 and type-2 samples do not have glass microspheres. Bone damage and mine trauma score values show that the type-3 boot provides absolute protection against 40g of Trinitrotoluene (TNT) and that the injuries that occurred in the tests performed using 70 and 110g of TNT can be reduced to a curable level without amputation.Item The effect of fibre volume fraction on damage initiation and propagation of woven carbon-epoxy multi-layer composites(Sage Publications, 2012-01) Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021In the current study, the mechanical behaviour, damage initiation and propagation properties of 2 x 2-twill woven carbon composites with various fibre volume fractions, under uni-axial tension in the warp direction, were investigated. Observations of damage were made using acoustic emission (AE), x-ray and microscopy techniques. The mechanical properties and strain values of the composite damage thresholds were determined. The strain levels at which AE events were recorded for the first time (i.e. the epsilon(min) values) were affected by variations in fibre volume fraction; however, characteristic strain values indicating damage initiation (i.e. epsilon(1) and epsilon(2)) were not affected by variations in fibre volume fraction.Item Effect of silica nanoparticles on mechanical properties of Kevlar/epoxy hybrid composites(Taylor & Francis, 2019-04-03) Jabbar, Madeha; Nawab, Yasir; Ashraf, Munir; Hussain, Tanveer; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500The addition of nanofillers in high-performance reinforcement results in the formation of hybrid composites. The objective of this research is to determine the effect of silica nanofillers loading on the mechanical properties of Kevlar/epoxy composites for ballistic use. Produced hybrid composite laminates were tested for flexural properties, tensile Properties and impact energy absorption. DMA analyses were performed to investigate composite properties at elevated temperatures. It was observed that introduction of silica nanofillers enhanced flexural properties, tensile strength, and storage modulus of composites. Impact energy absorption was increased up to a specific extent of nanofiller addition. The findings of this study indicate that introduction of silica nanofillers on Kevlar fabrics is a promising method for enhancing mechanical properties of hybrid composite laminates.Publication Effect of structural hybridization on ballistic performance of aramid fabrics(Sage Publications, 2019-06-01) Karahan, Mehmet; Karahan, Nevin; Nasir, Muhammad Ali; Nawab, Yasir; KARAHAN, MEHMET ALİ; KARAHAN, NEVİN; Bursa Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu; FEC-4798-2022; AAK-4298-2021This article presents an investigation regarding the ballistic performance of hybrid panels formed by combining woven and unidirectional (UD) para-aramid fabrics. For this purpose, hybrid panels are formed by combining woven and UD para-aramid fabrics with different ply ratios. The hybrid panels formed in this way are subjected to ballistic tests according to National Institute of Justice (NIJ) standard. The results show that hybrid panels present 4.48% less trauma depth as compared to 100% woven fabric panels and 3% less trauma diameter as compared to 100% UD fabric panels. Furthermore, 13.9% less energy is transmitted to the back side of hybrid panels as compared to 100% UD fabric panels. The energy absorbed per unit weight in hybrid panels is 8.48% more as compared to 100% woven fabrics. Additionally, in wet conditions, less trauma depth of hybrid panels is observed as compared to both 100% woven and 100% K-Flex UD fabric panels. No significant difference is realized in trauma diameter between hybrid panels and 100% woven fabric panels in wet conditions. However, 3.25% less trauma diameter is noticed in hybrid panels as compared to 100% UD fabric panels.Item Effect of weaving structure and hybridization on the low-velocity impact behavior of woven carbon-epoxy composites(Inst Chemical Fibres, 2014) Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Tekstil, Giyim, Ayakkabı ve Deri Bölümü.; AAK-4298-2021; 8649952500; 22034801200In the current study the low-velocity impact behaviour of composite materials obtained from carbon and carbon-aramid hybrid woven fabrics of different constructions, produced from the same yarn and under the same production conditions, was determined, and the effects of the weaving structure and hybridisation on the low velocity impact properties were investigated. Depending on the weaving structure, the best results were obtained for twill woven composites. The energy absorption capacity was increased by around 9 - 10% with hybridisation. It was observed that peak load values varied with a coefficient between 0.84-0.97 for hybrid composites, whereas the range was 0.49 - 0.87 for 100% carbon composites, depending on the bending stiffitess.Item Evaluation of foot protection effectiveness against AP mine blasts: Effect of deflector geometry(Amer Soc Testing Maretials, 2017) Kamberoǧlu, Murat; Alpdoğan, Can; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200In this study, the effectiveness of blast deflectors used in protective footwear against antipersonnel (AP) mines was investigated. The tip angle of a V-shaped deflector and the overall shape (symmetrical, unsymmetrical) were chosen as the design parameters to be examined, whereas parameters such as deflector material and wall thickness were kept constant. Both explicit dynamic finite element analysis (LS-Dyna) and blast tests were performed to evaluate the effectiveness of these design parameters. The analysis results were also verified with the blast tests. A visual (qualitative) comparison between the analysis results and the blast tests showed a good agreement on the final deformed geometry of the deflector, which suggested that the simulation was able to capture the energy absorption mechanism of the deflector. The analysis results showed that the peak force transmitted to the leg decreased tremendously with the addition of blast deflectors. When compared to the case with no deflectors, an unsymmetrical and symmetrical deflector reduced the peak force by a factor of 24 and 36, respectively.Item Evaluation of photovoltaic panels using different nano phase change material and a concise comparison: An experimental study(Pergamon-Elsevier Science Ltd, 2021-05) Jamil, Furqan; Ali, Hafiz Muhammad; Nasir, Muhammad Ali; Naseer, Ammar; Ejaz, Ali; Pasha, Riffat Asim; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Tekstil,Giyim,Ayakkabı Ve Deri, Tekstil Teknolojisi.; AAK-4298-2021; 8649952500The cooling techniques of photovoltaic (PV) panels captured special attention due to positive impact on PV panels efficiency as continuous elevation of temperature degraded its performance. A number of studies have suggested the better prospects of air, water and phase change material (PCM) for thermal management of PV modules. The present work studies three different nanoparticle-based nano-PCMs for acceleration in performance of PV panel in terms of temperature reduction and increment of electrical efficiency. The experimental methodology was tested in the outdoor conditions of Taxila, Pakistan during winter seasons by using different concentrations (0.25 wt% and 0.5 wt%) of multiwall carbon nanotubes nanoparticles, graphene nanoplatelets and magnesium oxide nanoparticles in phase change material (PT-58). The topmost performance of PV panel is found at 0.5 wt% nanomaterial concentration in graphene nanoplatelets/PT-58 nano-PCM. The experimental results indicate that maximum temperature reduction is observed to be 9.94 degrees C, 6.53 degrees C for PV/nano-PCM at 0.5 wt% of graphene nanoplatelets/PT-58 nano-PCM and 0.25 wt% of graphene nanoplatelets/PT-58 nano-PCM respectively while it was 5.01 degrees C for PV/PCM with highest observation in electrical efficiency of 12.10%, 11.97% and 11.74% respectively as compared to conventional PV panel. The maximum percentage increase of electrical power was 33.07% in case of GNPs/PT-58 nano-PCM at 0.5 wt% of nanomaterial in base PCM. The graphene nanoplatelets based nano-PCM exhibited best results in terms of temperature reduction as well as electrical efficiency and higher concentration of nanoparticles indicated good results compared to low concentration in nano-PCM. (C) 2021 Elsevier Ltd. All rights reserved.Item Experimental analysis of ILSS of glass fibre reinforced thermoplastic and thermoset textile composites enhanced with multiwalled carbon nanotubes(Korean Society of Mechanical Engineers, 2018-09-13) Zahid, Saamia; Nasir, Muhammad Ali; Nauman, Saad; Nawab, Yasir; Ali, H. M.; Khalid, Yasir; Nabeel, Muhammad; Ullah, Mudaser; Karahan, Mehmet; Bursa Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Tekstil, Giyim, Ayakkabı ve Deri Bölümü.; AAK-4298-2021; 8649952500In this study experimental investigation of interlaminar shear strength of glass fibre reinforced thermoplastic polyurethane (TPU) and epoxy based thermosets composites enhanced with multi walled carbon nanotubes (MWCNTs) is presented, and comparison is made between thermoplastic and thermosets composites. Suspension of MWCNTs in TPU and epoxy matrix was prepared using magnetic stirring and sonication technique. Both thermoplastic reinforced glass fibre and thermosets reinforced glass fibre composites were manufactured using hand layup technique. Carbon nanotubes were added in the concentrations of 0.1 %weight, 0.3 %weight and 0.5 %weight in both types of composites. Results showed that as the concentration of CNTs increases, the ILSS of the nanocomposites was also improved. With an addition of 0.5 % weight CNTs, there was improvement of 24.37 % in ILSS in epoxy based composites and 10.05 % enhancement in thermoplastic polyurethane reinforced glass fibre composites. The average ILSS obtained for thermoplastic polyurethane composites was less than that of epoxy composites. The TPU based composites also demonstrated inelastic deformations without any trace of brittle fracture. The pristine epoxy based composites on the other hand did show inelastic deformations followed by brittle fracture. Higher concentrations of MWCNTs led to an absence of brittle fracture during the tests, owing to the crack bridging effect of the CNTs.Item Experimental investigation of the effect of fabric construction on dynamic water absorbtion in terry fabrics(Fibres & Textiles Eastern Europe, 2007) Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu/Tekstil-Giyim-Ayakkabı ve Deri Bölümü.; AAK-4298-2021; 8649952500Dynamic water absorption properties of terry fabrics were investigated experimentally using 216 various terry fabric samples of different construction. It is shown that around 26% to 40% of water is absorbed during the first 10 seconds, depending on the fabric construction; the percentage of water absorption exceeds 50% in 30 seconds and reaches 75% in 100 seconds. Yarn type is found to have the most important effect on the dynamic water absorption properties of terry fabrics. 29.5 tex ring carded yarn has a faster water absorption than 29.5x2 tex ring carded yarn and 29.5x2 tex open end yarn, and 29.5x2 tex open end yarn has the lowest water absorption speed The effect of pile length, warp and weft density on the percentage of water absorption remains limited compared to that of yarn type, and no significant effect of these parameters on water absorption is found for the last 100 seconds.
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