Durability of Carbon Fiber Reinforced Plastics

Download Durability of Carbon Fiber Reinforced Plastics PDF Online Free

Author :
Publisher : CRC Press
ISBN 13 : 1003851630
Total Pages : 105 pages
Book Rating : 4.0/5 (38 download)

DOWNLOAD NOW!


Book Synopsis Durability of Carbon Fiber Reinforced Plastics by : Jun Koyanagi

Download or read book Durability of Carbon Fiber Reinforced Plastics written by Jun Koyanagi and published by CRC Press. This book was released on 2024-03-01 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Koyanagi presents a concise and practical guide to using a micromechanics approach to predict the strength and durability of unidirectionally aligned continuum carbon fiber reinforced plastics (CFRPs). As the use of composite materials in becomes more widespread in various fields, material durability is becoming an increasingly important consideration, particularly with regard to UN Sustainable Development Goals. Using more durable composite materials would help with achieving these goals. Because the failure of composite materials proceeds via the accumulation of micro failures and micro damage, a micromechanics approach is indispensable for estimating precise durability. In this practical guide, Koyanagi describes this approach and explains the precise durability of the composite materials with regard to the time dependence of micro failures. This book first explains the strength and durability of unidirectionally aligned continuum CFRPs. It then individually addresses fiber, resin, and the interface between the two on the basis of their micromechanics and introduces these components’ time and temperature dependences. Koyanagi uses finite element analysis and theoretical models to integrate the characteristics of the three components to explain the macro properties of the CFRPs. Various characteristics regarding strength and durability of CFRPs are also presented. This book is a valuable resource for researchers in academia and industry who work with composite materials. It will enable them to design composite structures, ensure their durability, evaluate them, and develop more durable composite materials.

Fiber, Matrix, and Interface Properties

Download Fiber, Matrix, and Interface Properties PDF Online Free

Author :
Publisher : ASTM International
ISBN 13 : 080312046X
Total Pages : 206 pages
Book Rating : 4.8/5 (31 download)

DOWNLOAD NOW!


Book Synopsis Fiber, Matrix, and Interface Properties by : Christopher J. Spragg

Download or read book Fiber, Matrix, and Interface Properties written by Christopher J. Spragg and published by ASTM International. This book was released on 1996 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Emphasizing fiber-matrix adhesion and its characterization in composite materials, reports results from applying the most commonly used test methods, such as fragmentation, pull-out, and indentation, to high-performance composites and their constituents. The 13 papers were presented at a symposium i

Natural and Synthetic Fiber Reinforced Composites

Download Natural and Synthetic Fiber Reinforced Composites PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 3527349308
Total Pages : 372 pages
Book Rating : 4.5/5 (273 download)

DOWNLOAD NOW!


Book Synopsis Natural and Synthetic Fiber Reinforced Composites by : Sanjay Mavinkere Rangappa

Download or read book Natural and Synthetic Fiber Reinforced Composites written by Sanjay Mavinkere Rangappa and published by John Wiley & Sons. This book was released on 2022-04-18 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural and Synthetic Fiber Reinforced Composites Discover a comprehensive exploration of fiber reinforced polymers by an expert team of editors Fiber reinforced polymer (FRP) composites offer several unique properties that make them ideal for use in a wide range of industries, from automotive and aerospace to marine, construction, and co-industrial. In Natural and Synthetic Fiber Reinforced Composites: Synthesis, Properties and Applications, a distinguished team of mechanical engineers delivers a comprehensive overview of fiber reinforced composites. This edited volume includes thorough discussions of glass-, cotton-, and carbon-fiber reinforced materials, as well as the tribological properties and non-structural applications of synthetic fiber composites. Readers will also find practical explorations of the structural evolution, mechanical features, and future possibilities of fiber, textile, and nano-cementitious materials. The physical and chemical properties of cotton fiber-based composites are explored at length, as are the extraordinary mechanical, thermal, electrical, electronic, and field emission properties of carbon nanotubes. This singular book also includes: A thorough discussion of recent advancements in natural fiber reinforced polymer composites, their implications, and the opportunities that arise as a result A comprehensive exploration of the thermal behavior of natural fiber-based composites An insightful review of the literature on sisal fiber with polymer matrices A response to the growing research gap in the existing literature regarding natural fiber-based polymer composites and solutions to address it Perfect for scientists, engineers, professors, and students working in areas involving natural and synthetic reinforced polymers and composites, Natural and Synthetic Fiber Reinforced Composites: Synthesis, Properties and Applications offers a one-of-a-kind resource to help readers understand a critical and rapidly evolving technology.

Interface Science and Composites

Download Interface Science and Composites PDF Online Free

Author :
Publisher : Academic Press
ISBN 13 : 0123750490
Total Pages : 853 pages
Book Rating : 4.1/5 (237 download)

DOWNLOAD NOW!


Book Synopsis Interface Science and Composites by : Soo-Jin Park

Download or read book Interface Science and Composites written by Soo-Jin Park and published by Academic Press. This book was released on 2011-07-18 with total page 853 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of Interface Science and Composites is to facilitate the manufacture of technological materials with optimized properties on the basis of a comprehensive understanding of the molecular structure of interfaces and their resulting influence on composite materials processes. From the early development of composites of various natures, the optimization of the interface has been of major importance. While there are many reference books available on composites, few deal specifically with the science and mechanics of the interface of materials and composites. Further, many recent advances in composite interfaces are scattered across the literature and are here assembled in a readily accessible form, bringing together recent developments in the field, both from the materials science and mechanics perspective, in a single convenient volume. The central theme of the book is tailoring the interface science of composites to optimize the basic physical principles rather than on the use of materials and the mechanical performance and structural integrity of composites with enhanced strength/stiffness and fracture toughness (or specific fracture resistance). It also deals mainly with interfaces in advanced composites made from high-performance fibers, such as glass, carbon, aramid, and some inorganic fibers, and matrix materials encompassing polymers, carbon, metals/alloys, and ceramics. Includes chapter on the development of a nanolevel dispersion of graphene particles in a polymer matrix Focus on tailoring the interface science of composites to optimize the basic physical principles Covers mainly interfaces in advanced composites made from high performance fibers

Composites for Construction

Download Composites for Construction PDF Online Free

Author :
Publisher : John Wiley & Sons
ISBN 13 : 0471681261
Total Pages : 572 pages
Book Rating : 4.4/5 (716 download)

DOWNLOAD NOW!


Book Synopsis Composites for Construction by : Lawrence C. Bank

Download or read book Composites for Construction written by Lawrence C. Bank and published by John Wiley & Sons. This book was released on 2006-07-21 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first textbook on the design of FRP for structural engineering applications Composites for Construction is a one-of-a-kind guide to understanding fiber-reinforced polymers (FRP) and designing and retrofitting structures with FRP. Written and organized like traditional textbooks on steel, concrete, and wood design, it demystifies FRP composites and demonstrates how both new and retrofit construction projects can especially benefit from these materials, such as offshore and waterfront structures, bridges, parking garages, cooling towers, and industrial buildings. The code-based design guidelines featured in this book allow for demonstrated applications to immediately be implemented in the real world. Covered codes and design guidelines include ACI 440, ASCE Structural Plastics Design Manual, EUROCOMP Design Code, AASHTO Specifications, and manufacturer-published design guides. Procedures are provided to the structural designer on how to use this combination of code-like documents to design with FRP profiles. In four convenient sections, Composites for Construction covers: * An introduction to FRP applications, products and properties, and to the methods of obtaining the characteristic properties of FRP materials for use in structural design * The design of concrete structural members reinforced with FRP reinforcing bars * Design of FRP strengthening systems such as strips, sheets, and fabrics for upgrading the strength and ductility of reinforced concrete structural members * The design of trusses and frames made entirely of FRP structural profiles produced by the pultrusion process

A Practical Guide to Plastics Sustainability

Download A Practical Guide to Plastics Sustainability PDF Online Free

Author :
Publisher : William Andrew
ISBN 13 : 0128215402
Total Pages : 691 pages
Book Rating : 4.1/5 (282 download)

DOWNLOAD NOW!


Book Synopsis A Practical Guide to Plastics Sustainability by : Michel Biron

Download or read book A Practical Guide to Plastics Sustainability written by Michel Biron and published by William Andrew. This book was released on 2020-04-18 with total page 691 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Practical Guide to Plastics Sustainability: Concept, Solutions, and Implementation is a groundbreaking reference work offering a broad, detailed and highly practical vision of the complex concept of sustainability in plastics. The book's aim is to present a range of potential pathways towards more sustainable plastics parts and products, enabling the reader to further integrate the idea of sustainability into their design process. It begins by introducing the context and concept of sustainability, discussing perceptions, drivers of change, key factors, and environmental issues, before presenting a detailed outline of the current situation with types of plastics, processing, and opportunities for improved sustainability. Subsequent chapters focus on the different possibilities for improved sustainability, offering a step-by-step technical approach to areas including design, properties, renewable plastics, and recycling and re-use. Each of these pillars are supported by data, examples, analysis and best practice guidance. Finally, the latest developments and future possibilities are considered. - Approaches the idea of sustainability from numerous angles, offering practical solutions to improve sustainability in the development of plastic components and products - Explains how sustainability can be applied across plastics design, materials selection, processing, and end of life, all set alongside socioeconomic factors - Considers key areas of innovation, such as eco-design, novel opportunities for recycling or re-use, bio-based polymers and new technologies

Sustainable Composites for Aerospace Applications

Download Sustainable Composites for Aerospace Applications PDF Online Free

Author :
Publisher : Woodhead Publishing
ISBN 13 : 0081021380
Total Pages : 390 pages
Book Rating : 4.0/5 (81 download)

DOWNLOAD NOW!


Book Synopsis Sustainable Composites for Aerospace Applications by : Mohammad Jawaid

Download or read book Sustainable Composites for Aerospace Applications written by Mohammad Jawaid and published by Woodhead Publishing. This book was released on 2018-04-27 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainable Composites for Aerospace Applications presents innovative advances in the fabrication, characterization and applications of LDH polymer nanocomposites. It covers fundamental structural and chemical knowledge and explores various properties and characterization techniques, including microscopic, spectroscopic and mechanical behaviors. Users will find a strong focus on the potential applications of LDH polymer nanocomposites, such as in energy, electronics, electromagnetic shielding, biomedical, agricultural, food packaging and water purification functions. This book provides comprehensive coverage of cutting-edge research in the field of LDH polymer nanocomposites and future applications, and is an essential read for all academics, researchers, engineers and students working in this area. - Presents fundamental knowledge of LDH polymer nanocomposites, including chemical composition, structural features and fabrication techniques - Provides an analytical overview of the different types of characterization techniques and technologies - Contains extensive reviews on cutting-edge research for future applications in a variety of industries

Handbook of Benzoxazine Resins

Download Handbook of Benzoxazine Resins PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0444537910
Total Pages : 709 pages
Book Rating : 4.4/5 (445 download)

DOWNLOAD NOW!


Book Synopsis Handbook of Benzoxazine Resins by : Hatsuo Ishida

Download or read book Handbook of Benzoxazine Resins written by Hatsuo Ishida and published by Elsevier. This book was released on 2011-07-13 with total page 709 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides a wide overview of the field, fundamental understanding of the synthetic methods and structure/property correlation, as well as studies related to applications in a wide range of subjects. The handbook also provides 1H and 13C NMR spectra, FTIR spectra, DSC and TGA thermograms to aid in research activities. Additional tables on key NMR and FTIR frequencies unique to benzoxazine, heat of polymerization, Tg, and char yield will greatly aid in the choice of proper benzoxazine for a specific application. - Provides thorough coverage of the chemistry and applications of benzoxazine resins with an evidence-based approach to enable chemists, engineers and material scientists to evaluate effectiveness - Features spectra, which allow researchers to compare results, avoid repetition and save time as well as tables on key NMR frequency, IR frequency, heat of polymerization, of many benzoxazine resins to aid them in selection of materials - Written by the foremost experts in the field

Durability of Carbon Fiber Reinforced Plastics

Download Durability of Carbon Fiber Reinforced Plastics PDF Online Free

Author :
Publisher :
ISBN 13 : 9781032442341
Total Pages : 0 pages
Book Rating : 4.4/5 (423 download)

DOWNLOAD NOW!


Book Synopsis Durability of Carbon Fiber Reinforced Plastics by : Jun Koyanagi

Download or read book Durability of Carbon Fiber Reinforced Plastics written by Jun Koyanagi and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Koyanagi presents a concise and practical guide to using a micromechanics approach to predict the strength and durability of unidirectionally aligned continuum carbon fiber reinforced plastics (CFRPs). As the use of composite materials in becomes more widespread in various fields, material durability is becoming an increasingly important consideration, particularly with regard to UN Sustainable Development Goals. Using more durable composite materials would help with achieving these goals. Because the failure of composite materials proceeds via the accumulation of micro failures and micro damage, a micromechanics approach is indispensable for estimating precise durability. In this practical guide, Koyanagi describes this approach and explains the precise durability of the composite materials with regard to the time dependence of micro failures. This book first explains the strength and durability of unidirectionally aligned continuum CFRPs. It then individually addresses fiber, resin, and the interface between the two on the basis of their micromechanics and introduces these components' time and temperature dependences. Koyanagi uses finite element analysis and theoretical models to integrate the characteristics of the three components to explain the macro properties of the CFRPs. Various characteristics regarding strength and durability of CFRPs are also presented. This book is a valuable resource for researchers in academia and industry who work with composite materials. It will enable them to design composite structures, ensure their durability, evaluate them, and develop more durable composite materials"--

High-Performance and Specialty Fibers

Download High-Performance and Specialty Fibers PDF Online Free

Author :
Publisher : Springer
ISBN 13 : 4431552030
Total Pages : 441 pages
Book Rating : 4.4/5 (315 download)

DOWNLOAD NOW!


Book Synopsis High-Performance and Specialty Fibers by : Japan The Society of Fiber Science and Techno

Download or read book High-Performance and Specialty Fibers written by Japan The Society of Fiber Science and Techno and published by Springer. This book was released on 2016-08-16 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the key technologies and characteristics of the modern man-made specialty fibers mainly developed in Japan. Since the production of many low-cost man-made fibers shifted to China and other Asian countries, Japanese companies have focused on production of high-quality, high-performance super fibers as well as highly functionalized fibers so-called ‘Shin-gosen’. ZylonTM and DyneemaTM manufactured by Toyobo, TechnoraTM produced by Teijin, and VectranTM developed by Kuraray are those examples of super fibers. Carbon fibers ToraycaTM from Toray have occupied the most advanced high-performance application area. Various types of polyester fibers having design-shaped cross-sections and special fiber morphologies and those showing specific physico-chemical properties have also been developed to acquire a high-value textile market of the world. This book describes how these high-tech fibers have been developed and what aspects are the most important in each fiber based on its structure-property relationship. Famous specialists both in industry and academia are responsible for the contents, explaining the design concepts and the special technologies for the production of these special fibers. For university teachers and students, this volume is an excellent textbook that elucidates the basic concepts of modern fibers. At the same time, researchers, both in academia and industry, will find a comprehensive overview of recent man-made fibers. This publication, presenting the most easily understandable general survey of specialty man-made fibers to date, is dedicated to the 70th-anniversary of the Society of Fiber Science and Technology, Japan.

Proceedings of the Scientific-Practical Conference "Research and Development - 2016"

Download Proceedings of the Scientific-Practical Conference

Author :
Publisher : Springer
ISBN 13 : 3319628704
Total Pages : 715 pages
Book Rating : 4.3/5 (196 download)

DOWNLOAD NOW!


Book Synopsis Proceedings of the Scientific-Practical Conference "Research and Development - 2016" by : K. V. Anisimov

Download or read book Proceedings of the Scientific-Practical Conference "Research and Development - 2016" written by K. V. Anisimov and published by Springer. This book was released on 2017-12-04 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book relates to the III Annual Conference hosted by The Ministry of Education and Science of the Russian Federation in December 2016. This event has summarized, analyzed and discussed the interim results, academic outputs and scientific achievements of the Russian Federal Targeted Programme “Research and Development in Priority Areas of Development of the Russian Scientific and Technological Complex for 2014–2020.” It contains 75 selected papers from 6 areas considered priority by the Federal Targeted Programme: computer science, ecology & environment sciences; energy and energy efficiency; lifesciences; nanoscience & nanotechnology and transport & communications. The chapters report the results of the 3-years research projects supported by the Programme and finalized in 2016.

Carbon Fibers and Their Composites

Download Carbon Fibers and Their Composites PDF Online Free

Author :
Publisher : CRC Press
ISBN 13 : 142002874X
Total Pages : 1174 pages
Book Rating : 4.4/5 (2 download)

DOWNLOAD NOW!


Book Synopsis Carbon Fibers and Their Composites by : Peter Morgan

Download or read book Carbon Fibers and Their Composites written by Peter Morgan and published by CRC Press. This book was released on 2005-05-20 with total page 1174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most literature pertaining to carbon fibers is of a theoretical nature. Carbon Fibers and their Composites offers a comprehensive look at the specific manufacturing of carbon fibers and graphite fibers into the growing surge of diverse applications that include flameproof materials, protective coatings, biomedical and prosthetics application

Corrosion Resistance of Stainless Steels

Download Corrosion Resistance of Stainless Steels PDF Online Free

Author :
Publisher : CRC Press
ISBN 13 : 9780824796297
Total Pages : 386 pages
Book Rating : 4.7/5 (962 download)

DOWNLOAD NOW!


Book Synopsis Corrosion Resistance of Stainless Steels by : C.P. Dillon

Download or read book Corrosion Resistance of Stainless Steels written by C.P. Dillon and published by CRC Press. This book was released on 1995-05-04 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work examines the corrosion of stainless steels and similar chromium-bearing nickel-containing higher alloys, detailing various corrosive environments, including atmospheric and fire-side corrosion, corrosion by water and soil, and corrosion caused by particular industrial processes. It presents the acceptable isocorosion parameters of concentration and temperature for over 250 chemicals for which stainless alloys are the preferred materials of construction.

Carbon Fibers and Their Composite Materials

Download Carbon Fibers and Their Composite Materials PDF Online Free

Author :
Publisher : MDPI
ISBN 13 : 3039211021
Total Pages : 186 pages
Book Rating : 4.0/5 (392 download)

DOWNLOAD NOW!


Book Synopsis Carbon Fibers and Their Composite Materials by : Luke Henderson

Download or read book Carbon Fibers and Their Composite Materials written by Luke Henderson and published by MDPI. This book was released on 2019-07-16 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon fiber is an oft-referenced material that serves as a means to remove mass from large transport infrastructure. Carbon fiber composites, typically plastics reinforced with the carbon fibers, are key materials in the 21st century and have already had a significant impact on reducing CO2 emissions. Though, as with any composite material, the interface where each component meets, in this case the fiber and plastic, is critical to the overall performance. This text summarizes recent efforts to manipulate and optimize the interfacial interaction between these dissimilar materials to improve overall performance.

Polymer Matrix Composites and Technology

Download Polymer Matrix Composites and Technology PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0857092227
Total Pages : 570 pages
Book Rating : 4.8/5 (57 download)

DOWNLOAD NOW!


Book Synopsis Polymer Matrix Composites and Technology by : Ru-Min Wang

Download or read book Polymer Matrix Composites and Technology written by Ru-Min Wang and published by Elsevier. This book was released on 2011-07-14 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given such properties as low density and high strength, polymer matrix composites have become a widely used material in the aerospace and other industries. Polymer matrix composites and technology provides a helpful overview of these materials, their processing and performance.After an introductory chapter, part one reviews the main reinforcement and matrix materials used as well as the nature of the interface between them. Part two discusses forming and molding technologies for polymer matrix composites. The final part of the book covers key aspects of performance, including tensile, compression, shear and bending properties as well as impact, fatigue and creep behaviour.Polymer matrix composites and technology provides both students and those in industry with a valuable introduction to and overview of this important class of materials. - Provides a helpful overview of these materials, their processing and performance incorporating naming and classification of composite materials - Reviews the main reinforcement and matrix materials used as well as the nature of the interface between them including damage mechanisms - Discusses forming and molding technologies for polymer matrix composites outlining various techniques and technologies

Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites

Download Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites PDF Online Free

Author :
Publisher : Woodhead Publishing
ISBN 13 : 0081023006
Total Pages : 480 pages
Book Rating : 4.0/5 (81 download)

DOWNLOAD NOW!


Book Synopsis Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites by : Mohammad Jawaid

Download or read book Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites written by Mohammad Jawaid and published by Woodhead Publishing. This book was released on 2018-09-14 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanical and Physical Testing of Biocomposites, Fibre-Reinforced Composites and Hybrid Composites covers key aspects of fracture and failure in natural/synthetic fiber reinforced polymer based composite materials, ranging from crack propagation, to crack growth, and from notch-size effect, to damage-tolerant design. Topics of interest include mechanical properties, such as tensile, flexural, compression, shear, impact, fracture toughness, low and high velocity impact, and anti-ballistic properties of natural fiber, synthetic fibers and hybrid composites materials. It also covers physical properties, such as density, water absorption, thickness swelling, and void content of composite materials fabricated from natural or synthetic materials. Written by leading experts in the field, and covering composite materials developed from different natural fibers and their hybridization with synthetic fibers, the book's chapters provide cutting-edge, up-to-date research on the characterization, analysis and modelling of composite materials. - Contains contributions from leading experts in the field - Discusses recent progress on failure analysis, SHM, durability, life prediction and the modelling of damage in natural fiber-based composite materials - Covers experimental, analytical and numerical analysis - Provides detailed and comprehensive information on mechanical properties, testing methods and modelling techniques

Comprehensive Composite Materials II

Download Comprehensive Composite Materials II PDF Online Free

Author :
Publisher : Elsevier
ISBN 13 : 0081005342
Total Pages : 0 pages
Book Rating : 4.0/5 (81 download)

DOWNLOAD NOW!


Book Synopsis Comprehensive Composite Materials II by :

Download or read book Comprehensive Composite Materials II written by and published by Elsevier. This book was released on 2017-08-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Composite Materials II, Second Edition, Eight Volume Set is a one-stop reference work spanning the whole composites science field, covering such topics as fiber reinforcements and general theory of composites, polymer matrix composites, metal matrix composites, test methods, nondestructive evaluation and smart composites, design and application, and nanocomposites, multifunctional materials and smart materials. Detailed coverage is also given to the development and application of the principles of multi-scale mechanics and physical model-based design methods and the incorporation of mechanisms of deformation and fracture into predictive design equations that are useful for the design engineer. Extensive coverage of topics related to nanocomposites, including nanoscale reinforcements, such as single-wall and multi-wall nanotubes, graphene nanoplatelets, and nanodiamonds are also covered. Includes up-to-date coverage of important commercial, consumer and aerospace/defense applications, including structural, mechanical, electronic, and medical uses of composites Covers new technologies with a special focus on nanocomposites and multifunctional materials, important for many areas, including structures and electronics Contains approximately 85% newly commissioned articles, with 15% of articles updated from the previous edition