Download or read book Durability Lifetime Predictions Adhesively Bonded Structures written by and published by . This book was released on 1987 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of past and current methods for life time or durability assessment of engineering structures is given. It is noted that adhesively bonded structures exhibit all the features that compromise the durability of metals and polymers plus additional features related to the interface between the adhesive and the adherend. A discussion of current techniques on adhesives is given which includes moisture diffusion, temperature, and other effects. It is suggested that the critical issue in durability predictions for adhesion science is the development of methods of measuring the properties of the various components in an adhesive joint. A technique based upon a new beam test for adhesion is outlined together with a new digital image correlation technique for measuring strain at the micro scale. The integration of these elements into a research technique to address time-dependent properties in situ are discussed. Keywords: Adhesives, Durability, Life Predictions, Life Cycle, Life Expectancy.

Download or read book Advances in Modeling and Design of Adhesively Bonded Systems written by S. Kumar and published by John Wiley & Sons. This book was released on 2013-05-29 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book comprehensively charts a way for industry to employ adhesively bonded joints to make systems more efficient and cost-effective Adhesively bonded systems have found applications in a wide spectrum of industries (e.g., aerospace, electronics, construction, ship building, biomedical, etc.) for a variety of purposes. Emerging adhesive materials with improved mechanical properties have allowed adhesion strength approaching that of the bonded materials themselves. Due to advances in adhesive materials and the many potential merits that adhesive bonding offers, adhesive bonding has replaced other joining methods in many applications. Containing nine articles written by world-renowned experts, the book deals with the advances in theoretical and computational modeling as well as the design and experimental aspects of adhesively bonded structural systems. Stress analysis and strength prediction of adhesively bonded structural systems, considering a range of material models under a variety of loading conditions, are discussed. Finite element modeling using macro-elements is elaborated on. Recent developments in modeling and experimental aspects of bonded systems with graded adhesive layers and dual adhesives are described. Simulation of progressive damage in bonded joints is addressed. A novel vibration-based approach to detect disbonding and delamination in composite joints is also discussed. Readership The book is central to a range of engineers including mechanical, reliability, construction and surface engineers as well as materials scientists who are engaged in the mechanics of structural adhesive joints. Industries that will use this book include aerospace, electronics, biomedical, automotive, ship building, and construction.

Download or read book Adhesive Joints written by Wulff Possart and published by John Wiley & Sons. This book was released on 2019-02-11 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive overview of adhesive bonding, providing both basic knowledge of polymer adhesives as well as insights into their mechanical and ageing properties. The book is unique in its up-to-date, self-contained summary of recent developments and in its integration of the theory, synthesis and mechanical properties of adhesive joints as well as their applications. Well-structured throughout, the first chapter introduces the initial state of adhesive joints and their formation, while subsequent chapters discuss the ageing and failure as well as the weathering of adhesive joints. In addition the issue of long-term behavior and lifetime predictions are considered. The text is rounded off by a look at future technological advances. The result is an essential reference for a wide range of disciplines

Download or read book Damage Characterisation and Lifetime Prediction of Bonded Joints Under Variable Amplitude Fatigue Loading written by Vikram Shenoy and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesive bonding is one of the most attractive joining techniques for any structural application, including high profile examples in the aerospace, automotive, marine construction and electrical industries. Advantages of adhesive bonding include; superior fatigue performance, better stress distribution and higher stiffness than conventional joining techniques. When the design of bonded joints is considered, fatigue is of critical importance in most structural applications. There are two main issues that are of importance; a) in-service damage characterisation during fatigue loading and, b) lifetime prediction under both constant and variable amplitude fatigue loading. If fatigue damage characterisation is considered, there has been some work to characterise damage in-situ using the backface strain (BFS) measurement technique, however, there has been little investigation of the effects of different types of fatigue behaviour under different types of geometry and loading. Regarding fatigue lifetime prediction of bonded joints, most of the work in the literature is concentrated with constant amplitude fatigue, rather than variable amplitude fatigue. Fatigue design of a bonded structure based on constant amplitude fatigue, when the actual loading on the structure is of the variable amplitude fatigue, can result in erroneous lifetime prediction. This is because of load interaction effects caused by changes in load ratio, mean load etc., which can decrease the fatigue life considerably. Therefore, the project aims to a) provide a comprehensive study of the use of BFS measurements to characterise fatigue damage, b) develop novel techniques for predicting lifetime under constant amplitude fatigue and c) provide an insight into various types of load interaction effects. In this project, single lap joints (SLJ) and compound double cantilever beam geometries were used. Compound double cantilever beams were used mainly to determine the critical strain energy release rate and to obtain the relationship between strain energy release rate and fatigue crack growth rate. The fatigue life of SLJs was found to be dominated by crack initiation at lower fatigue loads. At higher fatigue loads, fatigue life was found to consist of three phases; initiation, stable crack propagation and fast crack growth. Using these results, a novel damage progression model was developed, which can be used to predict the remaining life of a bonded structure. A non-linear strength wearout model (NLSWM) was also proposed, based on strength wearout experiments, where a normalised strength wearout curve was found to be independent of the fatigue load applied. In this model, an empirical parameter determined from a small number of experiments, can be used to determine the residual strength and remaining life of a bonded structure. A fracture mechanics approach based on the Paris law was also used to predict the fatigue lifetime under constant amplitude fatigue. This latter method was found to under-predict the fatigue life, especially at lower fatigue loads, which was attributed to the absence of a crack initiation phase in the fracture mechanics based approach. A damage mechanics based approach, in which a damage evolution law was proposed based on plastic strain, was found to predict the fatigue life well at both lower and higher fatigue loads. This model was able to predict both initiation and propagation phases. Based on the same model, a unified fatigue methodology (UFM) was proposed, which can be used to not only predict the fatigue lifetime, but also various other fatigue parameters such as BFS, strength wearout and stiffness wearout. The final part of the project investigated variable amplitude fatigue. In this case, fatigue lifetime was found to decrease, owing to damage and crack growth acceleration in various types of variable amplitude fatigue loading spectra. A number of different strength wearout approaches were proposed to predict fatigue lifetime under variable amplitude fatigue loading. The NLSWM, where no interaction effects were considered was found to over-predict the fatigue life, especially at lower fatigue loads. However, approaches such as the modified cycle mix and normalised cycle mix approaches were found to predict the fatigue life well at all loads and for all types of variable amplitude fatigue spectra. Progressive damage models were also applied to predict fatigue lifetime under variable amplitude fatigue loading. In this case a fracture mechanics based approach was found to under-predict the fatigue life for all types of spectra at lower loads, which was established to the absence of a crack initiation phase in this method. Whereas, a damage mechanics based approach was found to over-predict the fatigue lifetime for all the types of variable amplitude fatigue spectra, however the over- prediction remained mostly within the scatter of the experimental fatigue life data. It was concluded that, the damage mechanics based approach has potential for further modification and should be tested on different types of geometry and spectra.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 740 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strength Prediction of Adhesively Bonded Joints written by Raul D. S. G. Campilho and published by CRC Press. This book was released on 2017-05-25 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesively-bonded joints provide many advantages over conventional mechanical fasteners and are increasingly receiving attention as an alternative to mechanical joints in engineering applications. The traditional fasteners usually result in the cutting of fibers and hence the introduction of stress concentrations, both of which reduce structural integrity. By contrast, bonded joints are more continuous and have potential advantages of strength-to-weight ratio, design flexibility, and ease of fabrication. This book provides an overview of available analytical methods as well as numerical methods.

Download or read book Durability of Structural Adhesively Bonded Systems written by O. Ishai and published by . This book was released on 1983 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present report deals with the mechanical behavior of the bonded system after curing and in service when exposed to different hygrothermal conditions. An analysis was developed which enable the prediction of adhesive residual thermal stresses after curing, their time-dependence on temperature and moisture conditions, and the resulting deformational behaviour of the bonded system. The non-linear viscoelastic behaviour of the adhesive under such circumstances was tackled by using advanced finite-element approach. The deformational behaviour of a non-symetrical bonded specimens were exmained through experimental investigation. Analytical results indicate a significant Hygrothermal effects on stress relaxation in the adhesive at the viscoplastic range. A mathematical tool was developed to deal with the effect of stresses on interlaminer crack propagation. This will, provide the first step toward the prediction of failure initiation and propagation within the bonded phases, which is the objective of the next stage of the present project.

Download or read book Advances in Structural Adhesive Bonding written by David A. Dillard and published by Elsevier. This book was released on 2010-03-31 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesive bonding is often effective, efficient, and often necessary way to join mechanical structures. This important book reviews the most recent improvements in adhesive bonding and their wide-ranging potential in structural engineering. Part one reviews advances in the most commonly used groups of structural adhesives with chapters covering topics such as epoxy, polyurethane, silicone, cyanoacrylate, and acrylic adhesives. The second set of chapters covers the various types of adherends and pre-treatment methods for a range of structural materials such as metals, composites and plastics. Chapters in Part three analyse methods and techniques with topics on joint design, life prediction, fracture mechanics and testing. The final group of chapters gives useful and practical insights into the problems and solutions of adhesive bonding in a variety of hostile environments such as chemical, wet and extreme temperatures. With its distinguished editor and international team of contributors, Advances in structural adhesive bonding is a standard reference for structural and chemical engineers in industry and the academic sector. Reviews advances in the most commonly used groups of structural adhesives including epoxy, silicone and acrylic adhesives Examines key issues in adhesive selection featuring substrate compatibility and manufacturing demands Documents advances in bonding metals, plastics and composites recognising problems and limitations

Download or read book Mechanical Behaviour of Adhesive Joints written by G. Verchery and published by . This book was released on 1987 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Durability of Structural Adhesively Bonded System written by O. Ishai and published by . This book was released on 1981 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive literature survey is made and the findings of investigations conducted by the authors during the past few years in this field are summarized. Basic assumptions for the present work are outlined, based on the conclusions of the above survey. An analytical study, supported by empirical data, was conducted on the effects of the state of stress on the adhesive mechanical behavior of a bonded interlaminar layer phase in the non-linear range and the time-dependency of that behavior. Tests were conducted for the derivation of viscoelastic characteristics of the adhesive phase and of the thermoelastic and hygroelastic parameters of the representative adhesives and of CFRP adherends. The effects of temperature and humidity with exposure time on the above characteristics were investigated. The major objective of the experimental work was two-fold: To provide the basic data to serve as inputs for the analysis of the hygrothermomechanical behavior of the bonded system; To develop a methodology for the reduction of the vast experimental work involved in the derivation and evaluation of such data, which are essential for predicting the durability of bonded systems during real service life. (Author).

Download or read book Structural Integrity and Durability of Advanced Composites written by Peter Beaumont and published by Woodhead Publishing. This book was released on 2015-05-19 with total page 873 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Integrity and Durability of Advanced Composites: Innovative Modelling Methods and Intelligent Design presents scientific and technological research from leading composite materials scientists and engineers that showcase the fundamental issues and practical problems that affect the development and exploitation of large composite structures. As predicting precisely where cracks may develop in materials under stress is an age old mystery in the design and building of large-scale engineering structures, the burden of testing to provide "fracture safe design" is imperative. Readers will learn to transfer key ideas from research and development to both the design engineer and end-user of composite materials. This comprehensive text provides the information users need to understand deformation and fracture phenomena resulting from impact, fatigue, creep, and stress corrosion cracking and how these phenomena can affect reliability, life expectancy, and the durability of structures. Presents scientific and technological research from leading composite materials scientists and engineers that showcase fundamental issues and practical problems Provides the information users need to understand deformation and fracture phenomena resulting from impact, fatigue, creep, and stress corrosion cracking Enables readers to transfer key ideas from research and development to both the design engineer and end-user of composite materials

Download or read book Adhesives Technology Handbook written by Sina Ebnesajjad and published by William Andrew. This book was released on 2014-11-26 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering a wide range of industrial applications across sectors including medical applications, automotive/aerospace, packaging, electronics, and consumer goods, this book provides a complete guide to the selection of adhesives, methods of use, industrial applications, and the fundamentals of adhesion. Dr Ebnesajjad examines the selection of adhesives and adhesion methods and challenges for all major groups of substrate including plastics (thermosets and thermoplastics), elastomers, metals, ceramics and composite materials. His practical guidance covers joint design and durability, application methods, test methods and troubleshooting techniques. The science and technology of adhesion, and the principles of adhesive bonding are explained in a way that enhances the reader's understanding of the fundamentals that underpin the successful use and design of adhesives. The third edition has been updated throughout to include recent developments in the industry, with new sections covering technological advances such as nanotechnology, micro adhesion systems, and the replacement of toxic chromate technology. Provides practitioners of adhesion technology with a complete guide to bonding materials successfully Covers the whole range of commonly used substrates including plastics, metals, elastomers and ceramics, explaining basic principles and describing common materials and application techniques Introduces the range of commercially available adhesives and the selection process alongside the science and technology of adhesion

Download or read book Long Term Durability of Polymeric Matrix Composites written by Kishore V. Pochiraju and published by Springer Science & Business Media. This book was released on 2011-09-25 with total page 681 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long-Term Durability of Polymeric Matrix Composites presents a comprehensive knowledge-set of matrix, fiber and interphase behavior under long-term aging conditions, theoretical modeling and experimental methods. This book covers long-term constituent behavior, predictive methodologies, experimental validation and design practice. Readers will also find a discussion of various applications, including aging air craft structures, aging civil infrastructure, in addition to engines and high temperature applications.

Download or read book Durability of Adhesive Bonded Structures written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Surface Treatment in Bonding Technology written by Anna Rudawska and published by Academic Press. This book was released on 2019-04-15 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Treatment in Bonding Technology provides valuable advice on surface treatment methods, modern measuring devices, and the appropriate experimentation techniques that are essential to create strong joints with a reliable service life. The book's focus is on the detailed and up-to-date analysis of surface treatment methods for metallic and polymer substrates. An analysis of factors affecting the surface preparation stage, together with advice on selection, is also provided. Essential theory is combined with experimentation techniques and industry practice to provide a guide that is both practical and academically rigorous. Including a general introduction to bonding, as well as coverage of mechanical, chemical and electrochemical methods, this book is the ideal primer for anyone working with or researching adhesive bonding. Provides detailed descriptions of surface treatments and their mechanisms that will help readers build a deep understanding of these fundamental techniques Includes a thorough survey of recent advances in research in surface treatments of metals and polymers Provides technical advice on experimental testing methods throughout the book

Download or read book Adhesive Bonding written by Robert D. Adams and published by Woodhead Publishing. This book was released on 2021-07-02 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesive Bonding: Science, Technology and Applications, Second Edition guides the reader through the fundamentals, mechanical properties and applications of adhesive bonding. This thoroughly revised and expanded new edition reflects the many advances that have occurred in recent years. Sections cover the fundamentals of adhesive bonding, explaining how adhesives and sealants work, and how to assess and treat surfaces, how adhesives perform under stress and the factors affecting fatigue and failure, stress analysis, environmental durability, non-destructive testing, impact behavior, fracture mechanics, fatigue, vibration damping, and applications in construction, automotive, marine, footwear, electrical engineering, aerospace, repair, electronics, biomedicine, and bonding of composites. With its distinguished editor and international team of contributors, this book is an essential resource for industrial engineers, R&D, and scientists working with adhesives and their industrial applications, as well as researchers and advanced students in adhesion, joining, polymer science, materials science and mechanical engineering. Offers detailed, methodical coverage of the fundamentals, mechanical properties and industrial applications of adhesive bonding Enables the successful preparation of adhesives for a broad range of important load-bearing applications in areas such as automotive and aerospace, construction, electronics and biomedicine Covers the latest advances in adhesive bonding, including improved repair techniques for metallic and composite structures, cohesive zone modeling, and disassembly and recycling

Download or read book Progress in Adhesion and Adhesives Volume 8 written by K. L. Mittal and published by John Wiley & Sons. This book was released on 2024-10-01 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: Keep up-to-date with the latest on adhesion and adhesives from an expert group of worldwide authors. The book series “Progress in Adhesion and Adhesives” was conceived as an annual publication and the premier volume made its debut in 2015. The series has been well-received as it is unique and provides substantive and curated review chapters on subjects that touch many disciplines. The current book contains nine chapters on topics that include multi-component theories in surface thermodynamics and adhesion science; plasma-deposited polymer layers as adhesion promotors; functional interlayers to control interfacial adhesion in reinforced polymer composites; hydrophobic materials, and coatings from natural sources; mechanics of ice adhesion; epoxy adhesives technology: latest developments and trends; hot-melt adhesives for automobile assembly; lifetime estimation of thermostat adhesives by physical and chemical aging processes; and nondestructive evaluation and condition monitoring of adhesive joints. Audience The volume will appeal to adhesionists, adhesive technologists, polymer scientists, materials scientists, and those involved/interested in adhesive bonding, plasma polymerization, adhesion in polymer composites, durability and testing of adhesive joints, materials from natural sources, and ice adhesion and mitigation.