Download or read book Numerical Analysis of Adhesively Bonded Single Lap Joints Under High Speed Tensile Loading written by Sean M. McCann and published by . This book was released on 2015 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesively bonded joints pose complex solid mechanics problems through their inherent variations; material properties dependent on fabrication, stress singularities created by geometry of bonded structural assembly, and in a non-uniform state of stress when loaded. When testing adhesives at high strain rates additional variations are observed; particularly in strength. It is hypothesized that a non-uniform field of constitutive relations exists in an adhesive lap joint, owing to the strain rate sensitivity of the adhesive material. This study investigates the non-uniform distribution of strain rate in the overlap region of ASTM D3165 and D5656 single lap joint (SLJ) specimens, and how the strain rate sensitivity of the adhesive affects the stress distribution when the joint is subjected to varying tensile loading speeds. The numerical method of Finite Element Analysis (FEA) has been used to analyze the joint. Commercially available LS-DYNA implicit dynamics solver and one of its standard material formulations, *MAT_19_STRAIN_ RATE_DEPENDENT_PLASTICITY, were implemented to model incremental stiffness as a function of effective strain rate, within the adhesive lap joint. This thesis reports strain rates at various locations in the adhesive overlap for four test speeds, from 25.4 mm/s to 1270 mm/s. Results of stress distributions of the joint are presented comparing the relative effects of using strain rate insensitive and strain rate sensitive material models. Comparative results show that while the force vs. displacement curves show negligible change, strain rate levels and stresses at the bondline edge increase significantly with test speed. As this location is known to be site of failure initiation, these results indicate this may be an underlying mechanism controlling or at least affecting failure strengths of adhesive joints tested at high loading rates.
Download or read book Structural Adhesive Joints in Engineering written by R. D. Adams and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intention of this book is that it should contain everything an engineer needs to know to be able to design and produce adhesively bonded joints which are required to carry significant loads. The advan tages and disadvantages of bonding are given, together with a sufficient understanding of the necessary mechanics and chemistry to enable the designer to make a sound engineering judgement in any particular case. The stresses in joints are discussed extensively so that the engineer can get sufficient philosophy or feel for them, or can delve more deeply into the mathematics to obtain quantitative solutions even with elasto plastic behaviour. A critical description is given of standard methods of testing adhesives, both destructively and non-destructively. The essen tial chemistry of adhesives and the importance of surface preparation are described and guidance is given for adhesive selection by me ans of check lists. For many applications, there will not be a unique adhesive which alone is suitable, and factors such as cost, convenience, produc tion considerations or familiarity may be decisive. A list of applications is given as examples. The authors wish to increase the confidence of engineers using adhesive bonding in load-bearing applications by the information and experience presented. With increasing experience of adhesives en gineering, design will become more elegant as weH as more fitted to its products.
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 422 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 Advances in Numerical Modeling of Adhesive Joints written by Lucas Filipe Martins da Silva and published by Springer Science & Business Media. This book was released on 2011-10-15 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the most recent numerical modeling of adhesive joints. Advances in damage mechanics and extended finite element method are described in the context of the Finite Element method with examples of application. The book also introduces the classical continuum mechanics and fracture mechanics approach and discusses the boundary element method and the finite difference method with indication of the cases they are most adapted to. At the moment there a no numerical technique that can solve any problem and the analyst needs to be aware of the limitations involved in each case.
Download or read book Testing Adhesive Joints written by Lucas F.M. da Silva and published by John Wiley & Sons. This book was released on 2012-10-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Joining techniques such as welding, brazing, riveting and screwing are used by industry all over the world on a daily basis. A further method of joining has also proven to be highly successful: adhesive bonding. Adhesive bonding technology has an extremely broad range of applications. And it is difficult to imagine a product - in the home, in industry, in transportation, or anywhere else for that matter - that does not use adhesives or sealants in some manner. The book focuses on the methodology used for fabricating and testing adhesive and bonded joint specimens. The text covers a wide range of test methods that are used in the field of adhesives, providing vital information for dealing with the range of adhesive properties that are of interest to the adhesive community. With contributions from many experts in the field, the entire breadth of industrial laboratory examples, utilizing different best practice techniques are discussed. The core concept of the book is to provide essential information vital for producing and characterizing adhesives and adhesively bonded joints.
Download or read book A Study of Single lap Joints written by Matthew Paul Lempke and published by . This book was released on 2013 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-lap joints are a widely-used and relatively strong and simple way joining two materials via an overlapping bond. With the growing use of composite materials in modern design practices, the need to join increasingly dissimilar materials has arisen. As such, knowledge concerning the behavior of single-lap joints with dissimilar adherends is essential. To investigate the behavior of single-lap joints as material and geometric properties are varied under tensile loading, an analytically verified finite element parametric study was conducted on both ideally and adhesively bonded single-lap joints, measuring the changes in stress value at points of critical stress concentrations. In order to correlate the finite element analysis with real-world lap joint behavior, digital image correlation was used to record the deformation of lap joint specimens under a tensile load. A finite element model was then developed, and compared, to the experimental results. With the results of the parametric study and experimental comparison, trends in stress changes were identified and explained, and design suggestions were made based on these trends. The results of the experimental finite element model were reasonably correlated, and several suggestions for improvements were made. -- Abstract.
Download or read book Modeling of Adhesively Bonded Joints written by Lucas F. M. da Silva and published by Springer Science & Business Media. This book was released on 2008-10-14 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: A lot of recent developments have been made about adhesively bonded joints modeling using various methods of analysis. The increasing application of adhesives in industry is partly due to the increased sophistication and reliability of adhesive joints modeling. The book proposed intends to provide the designer with the most advanced stress analyses techniques in adhesive joints to reinforce the use of this promising bonding technique.
Download or read book A Coupled Stress diffusion Model for Adhesively Bonded Single Lap Joints written by and published by . This book was released on 2017 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents the research conducted in order to complete the doctoral dissertation entitled "A Coupled Stress-Diffusion Model for Adhesively Bonded Single Lap Joints" It is submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering at Oakland University. The document is organized in the following manner: Chapter One "Introduction and Literature Survey" gives the background about the stress distributions and mechanical behavior of adhesively bonded single lap joints. This chapter includes a brief description of the previous analytical, experimental and numerical works which is done in this field. At the end, it presents the motivation of this work. Chapter Two "Coupled Shear Stress-Diffusion Model for Adhesively Bonded Single Lap Joints" presents an analytical model for the bond-line shear stress due to tensile-shear load considering the moisture diffusion effect subjected to shear tensile load. In the presented analytical model the effect of bending of single lap joint under a shear tensile load is neglected. For various moisture exposure time the shear stress distribution along the single lap joint bonding area is explored. Finally, the finite element simulation is compared with presented analytical model. Chapter Three "Coupled Peel and Shear Stress-Diffusion Model for Adhesively Bonded Single Lap Joints" presents an analytical model for the bond-line peel and shear stresses due to tensile-shear load considering the moisture diffusion effect subjected to shear tensile load. In the presented analytical model the effect of bending of single lap joint under a shear tensile load is considered. It is, also, assumed that upper and lower adherends are similar in terms of material and geometry. For various moisture exposure time the peel and shear stresses distribution along the single lap joint bonding area is explored. Finally, the finite element simulation is compared with presented analytical model. Chapter Four "Coupled Peel and Shear Stress-Diffusion Model for Dissimilar Material Adhesively Bonded Single Lap Joints presents an analytical model for the bond-line peel and shear stresses due to tensile-shear load considering the moisture diffusion effect subjected to shear tensile load. In the presented analytical model the adherends dissimilarity along with effect of bending of single lap joint under a shear tensile load is considered. For various duration of moisture exposure time the peel and shear stresses distribution along the single lap joint bonding area is explored. At the end, the finite element simulation is compared with presented analytical model. Chapter Five "Coupled Elasto-Plastic Diffusion Model for Predicting Cohesive Failure of Adhesively Bonded Single Lap Joints" present an analytical model to predict the failure load of the single lap joint considering moisture diffusion effect. In the presented analytical model the cohesive is assumed to be as the single lap joint is failure. The results explore the various moisture diffusion time on shear strength of adhesively bonded single lap joint. Chapter Six "Cyclic Moistrue Testing of Adhesively-Bonded Single Lap Joints" illustrated effect of cyclic salt fug (sic) spray on the mechanical performance composite-based lightweight material single lap joints using experimental and finite element methods. For various moisture exposure time, the maximum shear tensile strength (load transfer capacity) and corresponding failure mode investigated. Finite element simulation is used to illustrate the effect of salt fog diffusion on bond-line stress distribution of the single lap joint. Chapter Seven "Conclusions and Future Work" summarizes the major findings of this dissertation research, and outline the potential for future work.
Download or read book Technological Aspects of Manufacturing and Numerical Modelling of Clinch Adhesive Joints written by Tomasz Sadowski and published by Springer. This book was released on 2015-05-23 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This short book describes the basic technological aspects involved in the creation of purely clinch and clinch-adhesive joints made of different types of adherent materials and employing different joining technologies. Basic parameters that need to be taken into account in the design process are also presented, while a comparison of experimental testing of the hybrid joint with simple clinching for a combination of different joining materials underlines the advantages of opting for hybrid joints. The book’s conclusions will facilitate the practical application of this new fastening technology.
Download or read book Handbook of Adhesion Technology written by Lucas F. M. da Silva and published by Springer. This book was released on 2021-01-14 with total page 1543 pages. Available in PDF, EPUB and Kindle. Book excerpt: Adhesives have been used for thousands of years, but until 100 years ago, the vast majority was from natural products such as bones, skins, fish, milk, and plants. Since about 1900, adhesives based on synthetic polymers have been introduced, and today, there are many industrial uses of adhesives and sealants. It is difficult to imagine a product—in the home, in industry, in transportation, or anywhere else for that matter—that does not use adhesives or sealants in some manner. The Handbook of Adhesion Technology is intended to be the definitive reference in the field of adhesion. Essential information is provided for all those concerned with the adhesion phenomenon. Adhesion is a phenomenon of interest in diverse scientific disciplines and of importance in a wide range of technologies. Therefore, this handbook includes the background science (physics, chemistry and materials science), engineering aspects of adhesion and industry specific applications. It is arranged in a user-friendly format with ten main sections: theory of adhesion, surface treatments, adhesive and sealant materials, testing of adhesive properties, joint design, durability, manufacture, quality control, applications and emerging areas. Each section contains about five chapters written by internationally renowned authors who are authorities in their fields. This book is intended to be a reference for people needing a quick, but authoritative, description of topics in the field of adhesion and the practical use of adhesives and sealants. Scientists and engineers of many different backgrounds who need to have an understanding of various aspects of adhesion technology will find it highly valuable. These will include those working in research or design, as well as others involved with marketing services. Graduate students in materials, processes and manufacturing will also want to consult it.
Download or read book Time Temperature Effect in Adhesively Bonded Joints written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-13 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The viscoelastic analysis of an adhesively bonded lap joint was reconsidered. The adherends are approximated by essentially Reissner plates and the adhesive is linearly viscoelastic. The hereditary integrals are used to model the adhesive. A linear integral differential equations system for the shear and the tensile stress in the adhesive is applied. The equations have constant coefficients and are solved by using Laplace transforms. It is shown that if the temperature variation in time can be approximated by a piecewise constant function, then the method of Laplace transforms can be used to solve the problem. A numerical example is given for a single lap joint under various loading conditions. Delale, F. and Erdogan, F. Unspecified Center NASA-CR-165775 NSF CME-78-09737; NGR-39-007-011...
Download or read book Adhesive Joints Formation Characteristics and Testing written by Kash L. Mittal and published by CRC Press. This book was released on 2023-01-27 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents the proceedings of the Second International Symposium on Adhesive Joints: Formation, Characteristics and Testing held in Newark, NJ, May 22-24, 2000. Since the first symposium, held in 1982, there had been tremendous research activity dealing with many aspects of adhesive joints. This volume contains a total of 21 papers, which were all properly peer reviewed, revised and edited before inclusion. Therefore, this book is not merely a collection of unreviewed manuscripts, but rather represents information which has passed peer scrutiny. Furthermore, the authors were asked to update their manuscripts, so the information contained in this book should be current and fresh. The book is divided into three parts: 1) General Papers; 2) Evaluation, Analysis and Testing; and 3) Durability Aspects. The topics covered include: molecular brush concepts in enhancing strength of adhesive joints; factors affecting performance of adhesive joints; substrate preparation and modification; interfacial/interphasial aspects; determination of locus of failure; analysis and evaluation of adhesive joints using various techniques; testing of adhesive joints; stress analysis; application of fracture mechanics; durability aspects; accelerated environmental degradation of adhesive joints; solvent uptake; and adhesives with special characteristics. This volume represents a commentary on the current R&D activity in this arena and it should be of great value and interest to anyone interested in adhesive bonding / adhesive joints. Furthermore, this volume contains a number of excellent review/overview articles, which should be of particular value.
Download or read book Cohesive Zone Modelling for Fatigue Life Analysis of Adhesive Joints written by Alireza Akhavan-Safar and published by Springer Nature. This book was released on 2022-01-24 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explains the numerical method for fatigue life analysis of adhesive joints using the CZM technique. CZM is a robust approach that is widely used for failure analysis of adhesive joints exposed to various stress conditions including fatigue. In this book, various aspects of the numerical evaluation of adhesive bonds using CZM are discussed. First of all, it is explained how different load and environmental parameters influence the service life of adhesive connections. Various types of CZM shapes and their applications are then discussed. It was answered how different parameters of a CZM should be defined. It is also discussed which CZM form should be used for each condition. The book then describes how the CZM parameters should be degraded to simulate the cyclic loading behavior of bonded structures. Various CZM strategies for the fatigue life assessment of adhesive joints are discussed. The book presents various techniques that can be followed for the simulation of load cycles for both high-cycle and low-cycle fatigue regimes based on the concepts of the CZM. Details of numerical methods to be considered in the FE software for the fatigue life assessment of adhesives with CZM are also described in this book. Finally, some numerical examples using CZM are also provided.
Download or read book Adhesive Joints written by K.L. Mittal and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume documents the proceedings of the International Symposium on Adhesive Joints: Formation, Characteristics and Testing held under the auspices of the Division of Polymer Mater ials:Science and Engineering of the American Chemical Society in Kansas City, MO, September 12-17, 1982. There is a myriad of applications (ranging from aerospace to surgery) where adhesives are used to join different materials, and concomitantly the understanding of the behavior of adhesive joints becomes very important. There are many factors which can influence the behavior of adhesive joints, e.g., substrate preparation, in terfacial aspects, joint design, mode of stress, external environ ment, etc., and in order to understand the joint behavior in a holistic manner, one must take due cognizance of all these germane factors. So this symposium was planned to address not only how to make acceptable bonds but their characterization, durability and testing were also accorded due consideration.
Download or read book Adhesion Science and Engineering written by and published by Elsevier. This book was released on 2002-11-14 with total page 2020 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mechanics of Adhesion shows that adhesion science and technology is inherently an interdisciplinary field, requiring fundamental understanding of mechanics, surfaces, and materials. This volume comprises 19 chapters. Starting with a background and introduction to stress transfer principles; fracture mechanics and singularities; and an energy approach to debonding, the volume continues with analysis of structural lap and butt joint configurations. It then continues with discussions of test methods for strength and constitutive properties; fracture; peel; coatings, the case of adhesion to a single substrate; elastomeric adhesives such as sealants. The role of mechanics in determining the locus of failure in bonded joints is discussed, followed by a chapter on rheology relevant to adhesives and sealants. Pressure sensitive adhesive performance; the principles of tack and tack measurements; and contact mechanics relevant to wetting and surface energy measurements are then covered. The volume concludes with sections on fibermatrix bonding and reinforcement; durability considerations for adhesive bonds; ultrasonic non-destructive evaluation of adhesive bonds; and design of adhesive bonds from a strength perspective. This book will be of interest to practitioners in the fields of engineering and to those with an interest in adhesion science.
Download or read book Adhesive Bonding written by Robert D. Adams and published by Elsevier. This book was released on 2005-03-08 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important collection reviews key research on adhesive behaviour and applications in sectors as diverse as construction and automotive engineering. The book is divided into three main parts: fundamentals, mechanical properties and applications. Part one focuses on the basic properties of adhesives, surface assessment and treatment. Part two concentrates on understanding how adhesives perform under stress and the factors affecting fatigue and failure. The final part of the book reviews industry specific applications in areas such as building and construction, transport and electrical engineering.With its distinguished editor and international team of contributors, Adhesive bonding is a standard reference for all those concerned with the industrial application of adhesives. - Essential information for all those concerned with the industrial application of adhesives - This important collection examines adhesives and adhesive bonding for load-bearing applications - Arranged in a user-friendly format with three main sections: fundamentals, generic uses and industry specific applications
Download or read book Analysis and Design of Advanced Composite Bonded Joints written by L. J. Hart-Smith and published by . This book was released on 1974 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in the analysis of adhesive-bonded joints are presented with particular emphasis on advanced composite structures. The joints analyzed are of double-lap, single-lap, scarf, stepped-lap and tapered-lap configurations. Tensile, compressive, and in-plane shear loads are covered. In addition to the usual geometric variables, the theory accounts for the strength increases attributable to adhesive plasticity (in terms of the elastic-plastic adhesive model) and the joint strength reductions imposed by imbalances between the adherends. The solutions are largely closed-form analytical results, employing iterative solutions on a digital computer for the more complicated joint configurations. In assessing the joint efficiency, three potential failure modes are considered. These are adherend failure outside the joint, adhesive failure in shear, and adherend interlaminar tension failure (or adhesive failure in peel). Each mode is governed by a distinct mathematical analysis and each prevails throughout different ranges of geometric sizes and proportions.
