[PDF] Effect Of Strain Rate On Adhesively Bonded Lap Joints With Similar And Dissimilar Adherends eBook
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Adhesively bonded joints provide several benefits, such as uniform stress distribution than conventional methods such as mechanical fastening. Hence, the knowledge of stresses inside the adhesive layer of an adhesively-bonded joint is essential for design analysis and joint strength prediction. In this thesis, the effect of strain rate on adhesively bonded single lap joints of similar and dissimilar adherends (Aluminum and Carbon fiber composites) with a number of adhesives was investigated.
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.
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.
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.
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.
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.
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.
A comprehensive introduction to the concepts of joining technologies for hybrid structures This book introduces the concepts of joining technology for polymer-metal hybrid structures by addressing current and new joining methods. This is achieved by using a balanced approach focusing on the scientific features (structural, physical, chemical, and metallurgical/polymer science phenomena) and engineering properties (mechanical performance, design, applications, etc.) of the currently available and new joining processes. It covers such topics as mechanical fastening, adhesive bonding, advanced joining methods, and statistical analysis in joining technology. Joining of Polymer-Metal Hybrid Structures: Principles and Applications is structured by joining principles, in adhesion-based, mechanical fastened, and direct-assembly methods. The book discusses such recent technologies as friction riveting, friction spot joining and ultrasonic joining. This is used for applications where the original base material characteristics must remain unchanged. Additional sections cover the main principles of statistical analysis in joining technology (illustrated with examples from the field of polymer-metal joining). Joining methods discussed include mechanical fastening (bolting, screwing, riveting, hinges, and fits of polymers and composites), adhesive bonding, and other advanced joining methods (friction staking, laser welding, induction welding, etc.). Provides a combined engineering and scientific approach used to describe principles, properties, and applications of polymer-metal hybrid joints Describes the current developments in design of experiments and statistical analysis in joining technology with emphasis on joining of polymer-metal hybrid structures Covers recent innovations in joining technology of polymer-metal hybrid joints including friction riveting, friction spot joining, friction staking, and ultrasonic joining Principles illustrated by pictures, 3D-schemes, charts, and drawings using examples from the field of polymer-metal joining Joining of Polymer-Metal Hybrid Structures: Principles and Applications will appeal to chemical, polymer, materials, metallurgical, composites, mechanical, process, product, and welding engineers, scientists and students, technicians, and joining process professionals.
An overview of the virtual crack closure technique is presented. The approach used is discussed, the history summarized, and insight into its applications provided. Equations for two-dimensional quadrilateral elements with linear and quadratic shape functions are given. Formula for applying the technique in conjuction with three-dimensional solid elements as well as plate/shell elements are also provided. Necessary modifications for the use of the method with geometrically nonlinear finite element analysis and corrections required for elements at the crack tip with different lengths and widths are discussed. The problems associated with cracks or delaminations propagating between different materials are mentioned briefly, as well as a strategy to minimize these problems. Due to an increased interest in using a fracture mechanics based approach to assess the damage tolerance of composite structures in the design phase and during certification, the engineering problems selected as examples and given as references focus on the application of the technique to components made of composite materials.
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.