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Literatura académica sobre el tema "Kevlar"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 7 de febrero de 2022

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Artículos de revistas sobre el tema "Kevlar"

Khusiafan, Firas J. "Use of KEVLAR ® 49 in Aircraft Components". Engineering Management Research 7, n.º 2 (27 de septiembre de 2018): 14. http://dx.doi.org/10.5539/emr.v7n2p14.

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Aircraft industry is also finding its way to adapt on the increasing demand not only considering aircraft safety and customer requirements, but also on the increasing legislative requirements in terms of resource efficiency and gas emissions. This document explores Kevlar 49’s application on aircraft components and why this material is specifically selected for such applications above any other Kevlar type of materials. Its functions, properties, advantages and disadvantages are discussed together with some alternative materials in lieu of Kevlar 49. In order to provide credible information, literature search was conducted using significant keywords in Google Scholar and journal repository Deepdyve. Kevalr ® 49 is considered an exceptional material for reinforcement to produce aircraft components. It has high tensile strength, lightweight, inert on some conditions, stiff, and resilient. However, Kevlar’s has poor compressive strength, workability and is overly stiff for some applications. Another disadvantage is its cost, though it was shown to belong to a middle ranged material relative to carbon fiber and Boron. But overall, there are extensive applications in aircraft components that are now continuously using this material as reinforcement with other materials like carbon and boron to arrive on an ideal blend of product.

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Neufeld, Mackenzie, Ahmed Samir Ead y Eric Lepp. "Design of a Braided Composite Badminton Racket on Solidworks". Alberta Academic Review 2, n.º 2 (18 de septiembre de 2019): 57–58. http://dx.doi.org/10.29173/aar64.

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Current badminton rackets are typically made out of steel, aluminium, or carbon fibre. Although these materials perform acceptably, there are some downsides to their properties. However, these non-ideal characteristics of badminton rackets may be overcome with the usage of different manufacturing materials, specifically braided composites. An example of a braided material is KevlarⓇ. Kevlar is a heat resistant and high strength synthetic fibre that can be manufactured into braids using a maypole braiding system. These Kevlar braids can then be manipulated to a preferred shape for the curing process. In order to come up with a feasible design to base the prototype, a 3D modelling software (SolidWorksTM) is used. This ensures geometrical viability and possible to manufacture of the prototype. Modeling a badminton racket on Solidworks required the modelling of a racket head, and handle. The head was created using 2 ellipses, one of which acted as a skeleton, or mould for the Kevlar braid, and the other was a hollow ellipse which encompassed the mold and acted as the Kevlar braid. The solid ellipse was created in two halves, each having either an extrusion or a hole in the ends. This allowed them to easily attach to form a full ellipse. Once modeled, the solid ellipse was 3D printed to act as the curing mandrel, an internal skeleton for the Kevlar braids. In order to attach the head to the handle, a three-part connector piece was created and 3D printed. The rod of the racket was not created with an internal skeleton because the flexibility would falter. Instead, the Kevlar braids were slid off the material after curing and attached to the racket heads connector piece. In order to have a balanced weight ratio throughout the racket, the grip was created with an internal 3D printed skeleton. This structure allowed for a feasible, flexible, and strong Kevlar based product.

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Radić, Vlado. "Kevlar and ballistic protection". Vojnotehnicki glasnik 44, n.º 6 (1996): 79–87. http://dx.doi.org/10.5937/vojtehg9601079r.

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Hosur, M. V., Jessie B. Mayo Jr., E. Wetzel y S. Jeelani. "Studies on the Fabrication and Stab Resistance Characterization of Novel Thermoplastic-Kevlar Composites". Solid State Phenomena 136 (febrero de 2008): 83–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.136.83.

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Kevlar has demonstrated the ability to protect well against ballistic threats but has low resistance to puncture. Correctional Kevlar has shown good resistance to puncture. However, the fabric is expensive, difficult to manufacture because of its tight weave construction, and has limited protection against ballistic threats. In an effort to produce materials that are less bulky, more flexible, and resistant to puncture, thermoplastic-Kevlar (TP-Kevlar) composites have been examined. Kevlar fabric was impregnated with thermoplastic film using a hot press to produce the composites. Static and dynamic puncture resistant properties of the TP-Kevlar composites were investigated using a National Institute of Justice (NIJ Standard 0115.00) Stab Tower. The TP-films used in this study were polyethylene, Surlyn, and co extruded-Surlyn, which is a co extrusion of Surlyn and polyethylene. Response of the polyethylene (PE)-Kevlar composites, Surlyn-Kevlar composites, and co extruded (COEX)-Kevlar composites to spike and knife threats under static and dynamic conditions were compared with that of neat Kevlar. The infusion of thermoplastic films into the Kevlar fabric was shown to dramatically increase puncture resistance during quasi-static and dynamic testing with spikes. The TP-film type also made a difference when examining the resistance on a comparative basis of the TP-Kevlar targets. The TP-Kevlar composite targets showed more resistance to quasi-static spike testing than quasi-static knife testing. Weapon comparisons revealed that the TP-Kevlar composite targets had more resistance to dynamic knife testing than dynamic spike testing.

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Mahbub, Rana Faruq, Lijing Wang, Lyndon Arnold, Sinnappoo Kaneslingam y Rajiv Padhye. "Thermal comfort properties of Kevlar and Kevlar/wool fabrics". Textile Research Journal 84, n.º 19 (23 de mayo de 2014): 2094–102. http://dx.doi.org/10.1177/0040517514532157.

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Recent research on ballistic vests has focused on comfort performance by enhancing thermal comfort and moisture management. Kevlar/wool fabric has been developed as a potential material for ballistic vests. This study investigates the thermal comfort properties of woven Kevlar/wool and woven Kevlar ballistic fabrics. In this context, the thermal resistance, water-vapor resistance, moisture management performance, air permeability and optical porosity of 100% Kevlar and Kevlar/wool ballistic fabrics were compared. The effects of fabric physical properties on laboratory-measured thermal comfort were analyzed. This study also presents the fabric bursting strength and tear strength for comparison. Experimental results showed a clear difference in thermal comfort properties of the two fabrics. It was found that Kevlar/wool possesses better moisture management properties and improved mechanical properties than Kevlar fabric.

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Muhammad Amir, Siti Madiha, Mohamed Thariq Hameed Sultan, Ain Umaira Md Shah, Mohammad Jawaid, Syafiqah Nur Azrie Safri, Shukri Mohd y Khairul Anuar Mohd Salleh. "Low Velocity Impact and Compression after Impact Properties on Gamma Irradiated Kevlar/Oil Palm Empty Fruit Bunch Hybrid Composites". Coatings 10, n.º 7 (3 de julio de 2020): 646. http://dx.doi.org/10.3390/coatings10070646.

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This work investigates the dynamic impact response of Kevlar/oil palm empty fruit bunch (EFB) hybrid composite structures with/without gamma radiation under low velocity impact (LVI) and compression after impact (CAI) test. The layering pattern Kevlar/oil palm EFB/Kevlar (K/OP/K) was applied in this work. Irradiation with gamma ray with various doses were applied from 25–150 kGy. LVI results shows that hybrid Kevlar/oil palm EFBs (Kevlar/OPEFB) that were not irradiated have greater impact resistance as compared to irradiated hybrid Kevlar/OPEFB. It was also observed that the hybridization of Kevlar/OPEFB with gamma irradiation helped to improve the compressive residual strength of the composites. It was found that Kevlar/OPEFB hybrid composites with the layering sequence K/OP/K can withstand up to 35 J of impact energy, with the optimum gamma radiation dose at 50 kGy.

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Zhang, Shui, Guo Zhong Li y Hai Yan Yuan. "Effect of the Chemical Treated Kevlar Fiber on the Behaviors of Cement Mortars". Advanced Materials Research 306-307 (agosto de 2011): 758–61. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.758.

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This work aims to evaluate the effect of Kevlar fibers with chemical treatment on the flexural strength, compressive strength and impact resistance of cement mortar. The experimental results exhibit that Kevlar fiber with a larger percentage can increase the flexural strength and improve the impact resistance of cement mortar, and the reinforcement effect of Kevlar fiber with chemical treatment is more obvious. The surface morphology of Kevlar fiber and the fracture surface of cement mortar reinforced with Kevlar fiber were observed by SEM, and the reinforcement mechanism of the Kevlar fiber on cement mortar was discussed.

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Stopforth, Riaan y Sarp Adali. "Experimental Investigation of the Bullet-proof Properties of Different Kevlar, Comparing .22 Inch with 9 mm Projectiles". Current Materials Science 13, n.º 1 (1 de octubre de 2020): 26–38. http://dx.doi.org/10.2174/2666145413666200206121427.

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Background: Results of an experimental study are given involving high-impact ballistic tests using .22 inch diameter ammunition (commonly known only as .22 ammunition) with the target set up as a combination of different numbers and weights of Kevlar layers. These experimental tests are conducted as literature indicating that the .22 projectiles are not as effective as with larger calibre ammunition. Present work is part of a research study to assess the safety limits of Kevlar layers of different weights against various calibre projectiles. Objective: The objective is to obtain test data to determine the number of Kevlar layers and weights needed for the design of safe bullet proof vests capable of stopping various size ammunition. In the present study, results are given for .22 inch ammunition, which provide data on the characteristics of high-speed ballistic penetration of .22 bullets into Kevlar layers and stopping distances in gel/Kevlar combinations. Methods: Tests were performed with Kevlar fabrics of different weights of Gram per Square Meter (GSM) to provide a comparison among different Kevlar fabrics as well as with different number of Kevlar layers. The tests were conducted with the use of a chronograph in a controlled test environment. The penetration depth in ballistic gelatine was recorded. Results: The results identify the number of layers of Kevlar required to stop a .22 projectile and the relationship between the different layers and weights of Kevlar materials. The results of the .22 projectile penetration are compared with those of different 9 mm Parabellum projectiles to assess the effect of different size ammunition on the bullet-proof capabilities of Kevlar. Experimental data on the penetration depths of different types of bullets into the gel/Kevlar combinations are presented using various graphs. Conclusion: The .22 projectiles perform similar penetration depths compared to that of 9 mm projectiles, and therefore cannot be considered as ineffective ammunition as literature has indicated.

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Gu, Dapeng, Bingli Fan, Fei Li, Yulin Yang y Suwen Chen. "Wear Process Analysis of the Polytetrafluoroethylene/Kevlar Twill Fabric Based on the Components’ Distribution Characteristics". Autex Research Journal 17, n.º 4 (20 de diciembre de 2017): 295–302. http://dx.doi.org/10.1515/aut-2016-0015.

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Abstract Polytetrafluoroethylene (PTFE)/Kevlar fabric or fabric composites with excellent tribological properties have been considered as important materials used in bearings and bushing, for years. The components’ (PTFE, Kevlar, and the gap between PTFE and Kevlar) distribution of the PTFE/Kevlar fabric is uneven due to the textile structure controlling the wear process and behavior. The components’ area ratio on the worn surface varying with the wear depth was analyzed not only by the wear experiment, but also by the theoretical calculations with our previous wear geometry model. The wear process and behavior of the PTFE/Kevlar twill fabric were investigated under dry sliding conditions against AISI 1045 steel by using a ring-on-plate tribometer. The morphologies of the worn surface were observed by the confocal laser scanning microscopy (CLSM). The wear process of the PTFE/Kevlar twill fabric was divided into five layers according to the distribution characteristics of Kevlar. It showed that the friction coefficients and wear rates changed with the wear depth, the order of the antiwear performance of the previous three layers was Layer III>Layer II>Layer I due to the area ratio variation of PTFE and Kevlar with the wear depth.

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Chang, Chang-Pin, Cheng-Hung Shih, Jhu-Lin You, Meng-Jey Youh, Yih-Ming Liu y Ming-Der Ger. "Preparation and Ballistic Performance of a Multi-Layer Armor System Composed of Kevlar/Polyurea Composites and Shear Thickening Fluid (STF)-Filled Paper Honeycomb Panels". Polymers 13, n.º 18 (13 de septiembre de 2021): 3080. http://dx.doi.org/10.3390/polym13183080.

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In this study, the ballistic performance of armors composed of a polyurea elastomer/Kevlar fabric composite and a shear thickening fluid (STF) structure was investigated. The polyurea used was a reaction product of aromatic diphenylmethane isocyanate (A agent) and amine-terminated polyether resin (B agent). The A and B agents were diluted, mixed and brushed onto Kevlar fabric. After the reaction of A and B agents was complete, the polyurea/Kevlar composite was formed. STF structure was prepared through pouring the STF into a honeycomb paper panel. The ballistic tests were conducted with reference to NIJ 0101.06 Ballistic Test Specification Class II and Class IIIA, using 9 mm FMJ and 44 magnum bullets. The ballistic test results reveal that polyurea/Kevlar fabric composites offer better impact resistance than conventional Kevlar fabrics and a 2 mm STF structure could replace approximately 10 layers of Kevlar in a ballistic resistant layer. Our results also showed that a high-strength composite laminate using the best polyurea/Kevlar plates combined with the STF structure was more than 17% lighter and thinner than the conventional Kevlar laminate, indicating that the high-strength protective material developed in this study is superior to the traditional protective materials.

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Tesis sobre el tema "Kevlar"

Valença, Silvio Leonardo. "Estudo de envelhecimento e propriedades mecânicas de compósito epóxi reforçado com tecido plano de kevlar e híbrido vidro/kevlar". Universidade Federal de Sergipe, 2014. https://ri.ufs.br/handle/riufs/3463.

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The epoxy resin has a widespread use in the manufacture of polymer composites to obtain various elements of structural engineering. The overall objective of this research is to evaluate the effect of reinforcing fabric architecture fiber-based Kevlar 49 and glass S on the mechanical performance of composites with epoxy matrix. It was observed that the mechanical performance of the epoxy resin and the composite, after natural aging and in seawater at a temperature of 70 ° C. Three architectures are designed for the production of tissue related to the structural reinforcement of the composite element: only aramid (Kevlar 49), and hybrid Kevlar 49 and glass S; varying the type of yarn and intertwining of the composition (fiber content in percentage) in each frame. The composite plates were made by hand casting process with epoxy matrix reinforced with woven fabrics of Kevlar fiber and Kevlar hybrid/glass, according to an innovative architecture. The mechanical properties of the composites were determined by tensile, bending and impact carried out in parallel and perpendicular to the warp direction. We used scanning electron microscopy to observe the reinforcement and matrix fractures after the mechanical tests. The composites with hybrid structure of Kevlar/glass on reinforcing fabric showed the best results with respect to the specific strength and impact energy.
A resina epóxi possui uma ampla utilização na fabricação de compósitos poliméricos, para obtenção de diversos elementos da engenharia estrutural. O objetivo geral desta Tese é avaliar o efeito da configuração do tecido de reforço à base de fibras de Kevlar 49 e vidro S no desempenho mecânico de compósitos com matriz epoxídica. Observou-se o desempenho mecânico da resina epóxi e do compósito, após envelhecimento natural ao ar livre e na água do mar sob temperatura de 70 ºC. Foram concebidas três configurações para produção do tecido referentes ao elemento de reforço estrutural do compósito: apenas em aramida (Kevlar 49), e híbrido de Kevlar 49 e fibra de vidro S; variando-se o tipo de entrelaçamento dos fios e composição (teor de fibra em percentual) em cada estrutura. Foram fabricadas placas do compósito pelo processo de moldagem manual com matriz epoxídica, reforçadas por tecidos planos em fibra de Kevlar, e híbrido Kevlar/vidro, de acordo com uma configuração inovadora. As propriedades mecânicas dos compósitos foram determinadas por ensaios de tração, flexão e impacto, realizados nas direções paralela e perpendicular ao urdume. Utilizou-se a microscopia eletrônica de varredura para observar as fraturas do reforço e matriz após os ensaios mecânicos. Os compósitos com estrutura híbrida de Kevlar/vidro no tecido de reforço apresentaram os melhores resultados com relação à resistência mecânica específica, bem como energia de impacto.

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Tomlinson, John Brian. "Studies of activiated carbon fibres". Thesis, Brunel University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315527.

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Brooks, Thomas Michael Brinten. "Condition assessment of Kevlar composite materials using Raman spectroscopy". Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/5052.

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Thesis (M.S.)--University of Missouri-Columbia, 2007.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 9, 2009) Includes bibliographical references.

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Brown, Kenneth Alexander. "A Study of Aerodynamics in Kevlar-Wall Test Sections". Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/49383.

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This study is undertaken to characterize the aerodynamic behavior of Kevlar-wall test sections and specifically those containing two-dimensional, lifting models. The performance of the Kevlar-wall test section can be evaluated against the standard of the hard-wall test section, which in the case of the Stability Wind Tunnel (SWT) at Virginia Tech can be alternately installed or replaced by the Kevlar-wall test section. As a first step towards the evaluation of the Kevlar-wall test section aerodynamics, a validation of the hard-wall test section at the SWT is performed, in part by comparing data from NACA 0012 airfoil sections tested at the SWT with those tested at several other reliable facilities. The hard-wall test section showing good merit, back-to-back tests with three different airfoils are carried out in the SWT's hard-wall and Kevlar-wall test sections. Kevlar-wall data is corrected for wall interference with a panel method simulation that simulates the unique boundary conditions of Kevlar-wall test sections including the Kevlar porosity, wall deflection, and presence of the anechoic chambers on either side of the walls. Novel measurements of the boundary conditions are made during the Kevlar-wall tests to validate the panel method simulation. Finally, sensitivity studies on the input parameters of the panel method simulation are conducted. The work included in this study encompasses a wide range of issues related to Kevlar-wall as well as hard-wall tunnels and brings to light many details of the performance of such test sections.
Master of Science

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Pate, Patricia Lynne. "The Preparation of and Upper Atmospheric Effects on Kevlar Films". W&M ScholarWorks, 1990. https://scholarworks.wm.edu/etd/1539625590.

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Watson, Simon A. "The modelling of impact damage in Kevlar-reinforced epoxy composite structures". Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395462.

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Nath, Rajat Bushan. "Finite element analysis of interfacial failure mechanisms in fibre-reinforced composites". Thesis, King's College London (University of London), 1998. https://kclpure.kcl.ac.uk/portal/en/theses/finite-element-analysis-of-interfacial-failure-mechanisms-in-fibrereinforced-composites(88b177ba-f351-4263-ac35-500680a21613).html.

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Chambers, John Joseph. "Parallel-lay aramid ropes for use as tendons in prestressed concrete". Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/8327.

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Mathur, Virat. "Effects of nanoscale inclusions on impact resistance of Kevlar-epoxy laminate composites". Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/10637.

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Kevlar, an aramid fiber, is one of the most widely used materials for various industrial applications, such as aerospace, automotive, sports, wind energy, biomedical, optics, as well as defense due to its extraordinary mechanical and thermal (fire retardancy) properties and lightweight. In the present study, graphene nanoflakes and nanoclays dispersed in epoxy resins at different weight percentages (0 to 10 wt.%) were incorporated with dry Kevlar fibers through wet-layup process, and then cured under vacuum and high temperature to make Kevlar/epoxy hybrid composites. The prepared composite panels of 16-ply were impact tested using a low-velocity impactor, and C-Scanned before and after the impact tests. During the impact tests, the impact force vs. displacement, impact force vs. time and impact energy values of the composite panels were analyzed and compared. The c-scans of the damaged composite panels were analyzed for damage area and depth. The damaged test panels were exposed to UV light and moisture for 8 days, with an interval of 4 days. The water contact angles around the damaged area were measured for each damaged composite panel. The test results, impact analysis and damage analysis showed that the nanoscale inclusions in the Kevlar/epoxy composites had a major impact in dissipating the kinetic energy into heat, other forms of energy, and elastic and plastic deformation, and thus saving the composite panels from the major damages. This comparative research study illustrated that the variation in nanomaterials in the epoxy of a composite makes a significant difference in the impact response of the laminate. This result may be useful for the further improvement of the Kevlar-based products in various industries.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering

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Cairns, Douglas Scott. "Impact and post-impact response of graphite/epoxy and Kevlar/epoxy structures". Thesis, Massachusetts Institute of Technology, 1987. http://hdl.handle.net/1721.1/14652.

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Vita. Title as it appeared in M.I.T. Graduate List, September 1987: Impact and post-impact response of laminated structures.
Bibliography: v.2, leaves 341-347.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1987.
by Douglas Scott Cairns.
Ph.D.

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Libros sobre el tema "Kevlar"

Yang, H. H. Kevlar aramid fiber. Chichester: J. Wiley, 1993.

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Devine, John. Bibliography on Kevlar 1984-1991. London: Institution of Mechanical Engineers,Information and Library Service, 1991.

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Stewart, Gail B. Stephanie Kwolek: Inventor of Kevlar. Detroit: KidHaven Press, 2008.

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Stewart, Gail B. Stephanie Kwolek: Inventor of Kevlar. Detroit: KidHaven Press, 2008.

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Stewart, Gail B. Stephanie Kwolek: Inventor of Kevlar. Detroit: KidHaven Press, 2008.

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Brown, John S. Kevlar legions: The transformation of the U.S. Army, 1989-2005. Washington, D.C: Center of Military History United States Army, 2011.

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Mckenna, Colin J. An analysis of the Dupont Kevlar new product development methodology. [s.l: The Author], 1997.

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Moran, James. Building your Kevlar canoe: A foolproof method and three foolproof designs. Camden, Me: Ragged Mountain Press/McGraw-Hill, 1995.

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Tsaw, William. An embedded fibre optic for damage growth monitoring in Kevlar composites. Ottawa: National Library of Canada, 1993.

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Building your Kevlar canoe: A foolproof method and three foolproof designs. Camden, Me: Ragged Mountain Press, 1995.

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Capítulos de libros sobre el tema "Kevlar"

Gooch, Jan W. "Kevlar®". En Encyclopedic Dictionary of Polymers, 411. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_6648.

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Das, Chapal K., Ganesh C. Nayak y Rathanasamy Rajasekar. "Kevlar Fiber-Reinforced Polymer Composites". En Polymer Composites, 209–74. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527645213.ch7.

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Baker, Ian. "Kevlar and Other Aramid Fibers". En Fifty Materials That Make the World, 101–4. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78766-4_19.

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Kawai, Hiromichi, Mitsuhiro Fukuda, Mariko Miyagawa y Miyuki Ochi. "Moisture Sorption Mechanism of Kevlar Fibers". En Integration of Fundamental Polymer Science and Technology—4, 371–75. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0767-6_45.

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Zabel, A., J. V. Wening, U. Rehder y K. H. Jungbluth. "Alloplastischer Kreuzbandersatz — 3-Bündelprothese (Kevlar) im Kniemodell". En Die Chirurgie und ihre Spezialgebiete Eine Symbiose, 651. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-95662-1_308.

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Briscoe, B. J. y D. R. Williams. "Chemically Grafted “Kevlar” Fibres and Their Surface Characterisation". En Controlled Interphases in Composite Materials, 67–76. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-011-7816-7_7.

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Matzkanin, George A. y Armando De Los Santos. "Nondestructive Characterization of Kevlar Composites Using Pulsed NMR". En Nondestructive Characterization of Materials II, 29–37. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-5338-6_3.

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Zhu, Deju, Barzin Mobasher y S. D. Rajan. "Characterization of Mechanical Behavior of Kevlar 49 Fabrics". En Experimental and Applied Mechanics, Volume 6, 377–84. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0222-0_46.

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Rajpoot, Abhishek, Vinay Pratap Singh y Samar Bahadur Yadaw. "Modelling, Fabrication and Characterization of Kevlar Reinforced Composite". En Lecture Notes in Mechanical Engineering, 21–30. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6469-3_2.

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Benedito, Oscar, Ricard Delgado-Gonzalo y Valerio Schiavoni. "KeVlar-Tz: A Secure Cache for Arm TrustZone". En Distributed Applications and Interoperable Systems, 109–24. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78198-9_8.

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Actas de conferencias sobre el tema "Kevlar"

Liu, Zhihui, Jing Shi y Yachao Wang. "Evaluating Tensile Properties of 3D Printed Continuous Fiber Reinforced Nylon 6 Nanocomposites". En ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6700.

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3D printing (additive manufacturing) has become a popular method to create three-dimensional objects due to its high efficiency and is easy to operate. 3D printing of continuous fiber reinforced polymers has been a challenge. The fused deposition modeling (FDM) processes for this purpose were proposed and made possible only several years ago. The 3D printed continuous fiber reinforced polymers are able to improve the mechanical properties by leaps and bounds. In this paper, we aim to investigate the possibility of further improve the mechanical properties of 3D printed continuous fiber reinforced polymers by adding nano fillers to the polymer matrix. In experiment, the Kevlar fiber is chosen to be the continuous fiber material, and nylon 6 (PA 6) is chosen to be the polymer matrix material. Carbon nanotubes (CNTs) and graphene nano platelets (GNPs) nanoparticles are first mixed with nylon 6 pellets to make nanocomposites. The nanocomposites are then extruded into filaments for 3D printing. During the 3D printing process, both Kevlar filament and nanocomposite filament are fed through the printing nozzle and deposited on the platform. Tensile specimens are made from pure PA 6 and four types of nanocomposites, namely, 0.1wt% CNT/PA 6, 1wt% CNT/PA 6, 0.1wt% GNP/PA 6, 1wt% GNP/PA 6. By incorporating four layers of Kevlar fiber, which leads to the weight percentage of about 9% for Kevlar fiber in materials, fiber composite tensile specimens are made from Kevlar/PA 6 composite and four fiber reinforced nanocomposites, namely, Kevlar/0.1%CNT/PA 6, Kevlar/1%CNT/PA 6, Kevlar/0.1%GNP/PA 6, and Kevlar/1%GNP/PA 6. The tensile tests reveal that CNTs filled PA 6 nanocomposites show less significant improvements in mechanical properties as compared to the GNP filled PA 6. With only 0.1wt% of GNP, the tensile modulus improves by 101%, and with 1wt% of GNP, the modulus improves by 153%. The results also indicate that although Kevlar fibers dominate the main mechanical properties of the printed composite materials, the existence of GNP nano fillers also provide noticeable contribution to the enhancement of tensile strengths and moduli, while the effect of CNTs is much less pronounced.

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Preece, Dale S. y Vanessa S. Berg. "Bullet Impact on Steel and Kevlar®/Steel Armor: Computer Modeling and Experimental Data". En ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-3050.

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Computer hydrocode analyses and ballistic testing have been used to investigate the effectiveness of steel plate armor against lead/copper bullets commonly available in the U.S. and across the world. Hydrocode simulations accurately predict the steel plate thickness that will prevent full penetration as well as the impact crater geometry (depth and diameter) in that thickness of steel armor for a 338 caliber bullet. Using the hydrocode model developed for steel armor, studies were also done for an armor consisting of a combination of Kevlar® and steel. These analyses were used to design the experiments carried out in the ballistics lab at Sandia National Laboratories. Ballistics lab testing resulted in a very good comparison between the hydrocode computer predictions for bullet impact craters in the steel plate armor and those measured during testing. During the experiments with the combination armor (Kevlar®/steel), the steel became a witness plate for bullet impact craters following penetration of the Kevlar®. Using the bullet impact craters in the steel witness plate it was determined that hydrocode predictions for Kevlar® armor are less accurate than for metals. This discrepancy results from the inability of the hydrocode (Eulerian) material model to accurately represent the behavior of the fibrous Kevlar®. Thus, this paper will present the hydrocode predictions and ballistics lab data for the interaction between a lead/copper bullet and several armoring schemes: 1) steel, 2) Kevlar®, and 3) a Kevlar®/steel combination.

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Berg, Vanessa S., Dale S. Preece, Jerome H. Stofleth y Mathew A. Risenmay. "Kevlar and Carbon Composite Body Armor: Analysis and Testing". En ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71433.

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Kevlar materials make excellent body armor due to their fabric-like flexibility and ultra-high tensile strength. Carbon composites are made up from many layers of carbon AS-4 material impregnated with epoxy. Fiber orientation is bidirectional, orientated at 0° and 90°. They also have ultra-high tensile strength but can be made into relatively hard armor pieces. Once many layers are cut and assembled they can be ergonomicically shaped in a mold during the heated curing process. Kevlar and carbon composites can be used together to produce light and effective body armor. This paper will focus on computer analysis and laboratory testing of a Kevlar/carbon composite cross-section proposed for body armor development. The carbon composite is inserted between layers of Kevlar. The computer analysis was performed with a Lagrangian transversely isotropic material model for both the Kevlar and Carbon Composite. The computer code employed is AUTODYN. Both the computer analysis and laboratory testing utilized different fragments sizes of hardened steel impacting on the armor cross-section. The steel fragments are right-circular cylinders. Laboratory testing was undertaken by firing various sizes of hardened steel fragments at square test coupons of Kevlar layers and heat cured carbon composites. The V50 velocity for the various fragment sizes was determined from the testing. This V50 data can be used to compare the body armor design with other previously designed armor systems. AUTODYN [1] computer simulations of the fragment impacts were compared to the experimental results and used to evaluate and guide the overall design process. This paper will include the detailed transversely isotropic computer simulations of the Kevlar/carbon composite cross-section as well as the experimental results and a comparison between the two. Conclusions will be drawn about the design process and the validity of current computer modeling methods for Kevlar and carbon composites.

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Nawafleh, Nashat, Jordan Chabot, Mutabe Aljaghtham, Cagri Oztan, Edward Dauer, Recep M. Gorguluarslan, Teyfik Demir y Emrah Celik. "Additive Manufacturing of Kevlar Reinforced Epoxy Composites". En ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-12215.

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Abstract Additive manufacturing is defined as layer-by-layer deposition of materials on a surface to fabricate 3D objects with reduction in waste, unlike subtractive manufacturing processes. Short, flexible Kevlar fibers have been used in numerous studies to alter mechanical performance of structural components but never investigated within printed thermoset composites. This study investigates the effects of adding short Kevlar fibers on mechanical performance of epoxy thermoset composites and demonstrates that the addition of Kevlar by 5% in weight significantly improves flexure strength, flexural modulus, and failure strain by approximately 49%, 19%, and 38%, respectively. Hierarchical microstructures were imaged using scanning electron microscopy to observe the artefacts such as porosity, infill and material interdiffusion, which are inherent drawbacks of the 3D printing process.

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Ruggiero, Eric, Paolo Susini y Roderick Lusted. "Kevlar Fiber Brush Seals for LNG Compressors". En 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4623.

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Fonseca, Viviane M., Erick J. P. A. Oliveira, Pedro T. Lima y Laura H. Carvalho. "DEVELOPMENT OF KEVLAR COMPOSITES FOR BALLISTIC APPLICATION". En Brazilian Conference on Composite Materials. Pontifícia Universidade Católica do Rio de Janeiro, 2018. http://dx.doi.org/10.21452/bccm4.2018.09.04.

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Recchia, Stephen S., Assimina Pelegri, Jan K. Clawson, Korhan Sahin, Ioannis Chasiotis y James Zheng. "A Hierarchical Model for Kevlar Fiber Failure". En ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-66344.

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Advances in materials characterization at the submicron and the nano-scales have progressed in the last decade. At the same time, computational capability for finite element analyses are also improving through technological developments in parallel computing. However, large computational models of nanostructured materials are currently limited by the lack of validation data. The work reported in this paper describes the formulation of a representative nanoscale model for Kevlar fibers based on failure section imaging that captures its fibril and microfibril structure. In this regard, a finite element model that captures the nanoscale structure of Kevlar fibers was developed to predict their macroscale response. Experimental derivation of geometrical parameters and physical properties of fibrils and microfibrils is challenging due to the sensitive nature of polymers. There are several microfibril parameters that reflect into effective fiber response, such as the microfibril constitutive behavior, length, diameter, shape, the inter-fibril shear and normal strength, and the inter-fibril normal and tangential force decay the after peak strength is achieved. This paper investigates the effect of each of the aforementioned parameters on the initial modulus, yield strength, ultimate strength, and strain rate dependence of Kevlar fibers with 10 μm average diameter. The sensitivity of the macroscale response to each microfibril parameter can be used to identify areas where experimental information can further enable the predictive capability of the computational model. A parametric study was performed to calculate the effective macroscale fiber response. Subsequently, a local gradient sensitivity method was employed to plot the sensitivity of the fiber response to each microfibril parameter.

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Samlal, Stanley, R. Santhanakrishnan, Puja Asritha, Nisa Beegum y V. Paulson. "Projectile impact behaviour on various Kevlar composites". En 3RD INTERNATIONAL CONFERENCE ON FRONTIERS IN AUTOMOBILE AND MECHANICAL ENGINEERING (FAME 2020). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0034302.

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Szoke, Máté, Stewart A. Glegg y William J. Devenport. "Investigating the Aeroacoustic Properties of Kevlar Fabrics". En AIAA AVIATION 2021 FORUM. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2021. http://dx.doi.org/10.2514/6.2021-2255.

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I. Mourad, Abdel-Hamid, Mouza S. Al Mansoori, Lamia A. Al Marzooqi, Farah A. Genena y Nizamudeen Cherupurakal. "Optimization of Curing Conditions and Nanofiller Incorporation for Production of High Performance Laminated Kevlar/Epoxy Nanocomposites". En ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-85067.

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Kevlar composite materials are getting scientific interest in repairing of oil and gas pipelines in both offshore and onshore due to their unique properties. Curing is one of the major factor in deciding the final mechanical performance of laminated Kevlar/epoxy nanocomposites. The parameters such as curing time, temperature and applied pressure during the hot pressing will affect chemistry of crosslinking of the epoxy matrix and interaction of epoxy with the Kevlar fiber. The present study is carried out to evaluate the optimal curing conditions of the Kevlar/epoxy nanocomposites. Three different nanofillers (namely Multi walled Carbon nanotubes (MWCNT), Silicon Carbide (SiC) and Aluminum Oxide (Al2O3)) are incorporated in different weight percentage. Differential Scanning Calorimetry (DSC) and Thermo-Gravimetric Analysis (TGA) tests are carried out to determine the thermal stability and optimal curing conditions. Mechanical performance is investigated by conducting flexure, and drop weight tests. The results show that, the optimal curing temperature for maximizing the mechanical properties is at 170°C. Peeling off the Kevlar layers are observed for nanocomposite samples cured under 100°C. Mechanical strength of the composites is enhanced by optimizing the curing conditions and nanofiller contents.

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Informes sobre el tema "Kevlar"

Tubis, R. I. Kevlar Stitch Patterns. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 1986. http://dx.doi.org/10.21236/ada176783.

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Davison, Jack W., John C. Knight, Michele Co, Jason D. Hiser y Anh Nguyen-Tuong. Kevlar: Transitioning Helix for Research to Practice. Fort Belvoir, VA: Defense Technical Information Center, marzo de 2016. http://dx.doi.org/10.21236/ad1005651.

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Davidson, Jack W., John C. Knight, Michele Co, Jason D. Hiser y Anh Nguyen-Tuong. Kevlar: Transitioning Helix from Research to Practice. Fort Belvoir, VA: Defense Technical Information Center, abril de 2015. http://dx.doi.org/10.21236/ada616998.

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Ervin, Matthew H. y Jacquelyn M. Krintz. Fabrication of Graphene on Kevlar Supercapacitor Electrodes. Fort Belvoir, VA: Defense Technical Information Center, mayo de 2011. http://dx.doi.org/10.21236/ada619191.

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Raftenberg, Martin N., Michael J. Scheidler y Paul Moy. Transverse Compression Response of a Multi-Ply Kevlar Vest. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2004. http://dx.doi.org/10.21236/ada430190.

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Mulkern, Thomas J. y Martin N. Raftenberg. Kevlar KM2 Yarn and Fabric Strength Under Quasi-Static Tension. Fort Belvoir, VA: Defense Technical Information Center, octubre de 2002. http://dx.doi.org/10.21236/ada408883.

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Raftenberg, Martin N. y Thomas J. Mulkern. Quasi-Static Uniaxial Tension Characteristics of Plain-Woven Kevlar KM2 Fabric. Fort Belvoir, VA: Defense Technical Information Center, diciembre de 2002. http://dx.doi.org/10.21236/ada409229.

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Raftenberg, Martin N., Mike Scheidler, Thomas J. Moynihan y Charles A. Smith. Plain-Woven, 600-Denier Kevlar KM2 Fabric Under Quasistatic, Uniaxial Tension. Fort Belvoir, VA: Defense Technical Information Center, marzo de 2005. http://dx.doi.org/10.21236/ada432854.

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Burgett, Chase Ryan y John L. Bignell. Aluminum/Kevlar^® Composite In-Plane Crush Properties Testing. Office of Scientific and Technical Information (OSTI), mayo de 2018. http://dx.doi.org/10.2172/1527325.

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Long, Joseph B. Kevlar Vest Protection Against Blast Overpressure Brain Injury: Systemic Contributions to Injury Etiology. Fort Belvoir, VA: Defense Technical Information Center, mayo de 2009. http://dx.doi.org/10.21236/ada506328.

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