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Author: Alejandro Rodríguez Puig Publisher: ISBN: Category : Languages : en Pages :
Book Description
This work is first approach study of the effects of fiber waviness on the elastic properties, specially the Young's Modulus, of Laminate Composite Materials. This study has been carried out at the Institute for Aircraft Design (Intitut für Fleugzeugbau) of the University of Stuttgart (Universität Stuttgart) in Germany under the supervision of Dr. Anthony K. Pickett. The study involved work in three main areas: analytical, Finite Elements Analysis (FEA) and experimental. The analytical analysis has been developed from the studies carried out by H.M. Hsiao and I.M. Daniel from the Northwestern University in Evanston, Illinois, USA, in which they establish a complete and a simplified calculus procedure for different waviness types. In this work, the complete procedure was used. ([1] and [2]) The FEA analysis was carried out using the commercial code from ESI group. As only elastic properties were tested, no delamination on failure models were developed. The experimental analysis included the manufacturing of suitable laminate specimens of carbon fiber. Compression tests until first ply failure were also carried out in order to state the variation of elastic properties for a given relation of wave amplitude and wavelength.
Author: Alejandro Rodríguez Puig Publisher: ISBN: Category : Languages : en Pages :
Book Description
This work is first approach study of the effects of fiber waviness on the elastic properties, specially the Young's Modulus, of Laminate Composite Materials. This study has been carried out at the Institute for Aircraft Design (Intitut für Fleugzeugbau) of the University of Stuttgart (Universität Stuttgart) in Germany under the supervision of Dr. Anthony K. Pickett. The study involved work in three main areas: analytical, Finite Elements Analysis (FEA) and experimental. The analytical analysis has been developed from the studies carried out by H.M. Hsiao and I.M. Daniel from the Northwestern University in Evanston, Illinois, USA, in which they establish a complete and a simplified calculus procedure for different waviness types. In this work, the complete procedure was used. ([1] and [2]) The FEA analysis was carried out using the commercial code from ESI group. As only elastic properties were tested, no delamination on failure models were developed. The experimental analysis included the manufacturing of suitable laminate specimens of carbon fiber. Compression tests until first ply failure were also carried out in order to state the variation of elastic properties for a given relation of wave amplitude and wavelength.
Author: Emile Greenhalgh Publisher: Elsevier ISBN: 1845696816 Category : Technology & Engineering Languages : en Pages : 608
Book Description
The growing use of polymer composites is leading to increasing demand for fractographic expertise. Fractography is the study of fracture surface morphologies and it gives an insight into damage and failure mechanisms, underpinning the development of physically-based failure criteria. In composites research it provides a crucial link between predictive models and experimental observations. Finally, it is vital for post-mortem analysis of failed or crashed polymer composite components, the findings of which can be used to optimise future designs.Failure analysis and fractography of polymer composites covers the following topics: methodology and tools for failure analysis; fibre-dominated failures; delamination-dominated failures; fatigue failures; the influence of fibre architecture on failure; types of defect and damage; case studies of failures due to overload and design deficiencies; case studies of failures due to material and manufacturing defects; and case studies of failures due to in-service factors.With its distinguished author, Failure analysis and fractography of polymer composites is a standard reference text for researchers working on damage and failure mechanisms in composites, engineers characterising manufacturing and in-service defects in composite structures, and investigators undertaking post-mortem failure analysis of components. The book is aimed at both academic and industrial users, specifically final year and postgraduate engineering and materials students researching composites and industry designers and engineers in aerospace, civil, marine, power and transport applications. Examines the study of fracture surface morphologies in uderstanding composite structural behaviour Discusses composites research and post-modern analysis of failed or crashed polymer composite components Provides an overview of damage mechanisms, types of defect and failure criteria
Author: Rani Elhajjar Publisher: John Wiley & Sons ISBN: 1118997700 Category : Technology & Engineering Languages : en Pages : 234
Book Description
Presents the latest strategies in the development and use of composite materials for large structures and the effects of defects Practical Design and Validation of Composites Structures: Effects of Defects offers an important guide to the use of fiber-reinforced composites and how they affect the durability and safety of engineering structures such as aircraft, ships, bridges, wind turbines as well as sporting equipment. The text draws on the authors’ direct experience in industry and academia to cover the most recent strategies in the development of composite structures and uniquely integrates the assessment of the effects of defects introduced during production. This comprehensive resource builds on an essential introduction to the characteristics of composites and the most common types of defects encountered in production. The authors review the recent manufacturing methods and technologies used for inspecting composite structures and the design issues related to an analysis of their failure and strength incorporating the variability of processing. The text also contains information on the latest regulatory requirements and the relevant standards associated with the testing and design within a robust design philosophy and approach. This important resource: Offers a comprehensive review of the most current regulatory developments in the use of composites for the construction of complex composite structures Presents information on the basic characteristics of composites Includes testing strategies for determining the impacts of production defects Reviews the most current manufacturing methods and inspection technologies in the field Contains methods for statistical analysis and processing of experimental effects of defects test data Written for professional engineers in mechanical engineering, automotive engineering, aerospace engineering, civil engineering, and energy engineering as well as industry and academic researchers, Practical Design and Validation of Composites Structures: Effects of Defects is the hands-on text that covers the essential information needed to understand the use of composites and how they affect complex engineering projects using composites.
Author: Michael William Lerman Publisher: ISBN: Category : Composite materials Languages : en Pages : 212
Book Description
Defects in materials can reduce strengths and lifetimes of manufactured parts. The number of possible defects increase with the complexity inherent in composite materials. The wind industry uses composite wind turbine blades in which the manufacturing process induces a number of defects. In order for the wind industry to continue sustainable expansion, the effects of defects must be better understood. In-plane (IP) fiber waviness is the focus of this work. The three main parts of this work include testing on the coupon level, modeling on the coupon level, and testing of beams in four-point bending (with and without defects). The coupon level testing includes partial IP waves, similar to those in manufactured parts, rather than full width IP waves. This allows investigation into complex interactions and varying failure mechanisms caused by the fiber misalignment gradient. Partial waves are also modeled to both validate testing as well as to increase robustness of a previously developed progressive damage modeling method. Lastly, a sandwich beam test specimen for testing in 4-point bending is developed to investigate the effects of fiber waviness in both tension and compression when loaded in flexure.
Author: M. W. Hyer Publisher: DEStech Publications, Inc ISBN: 193207886X Category : Technology & Engineering Languages : en Pages : 718
Book Description
Updated and improved, Stress Analysis of Fiber-Reinforced Composite Materials, Hyer's work remains the definitive introduction to the use of mechanics to understand stresses in composites caused by deformations, loading, and temperature changes. In contrast to a materials science approach, Hyer emphasizes the micromechanics of stress and deformation for composite material analysis. The book provides invaluable analytic tools for students and engineers seeking to understand composite properties and failure limits. A key feature is a series of analytic problems continuing throughout the text, starting from relatively simple problems, which are built up step-by-step with accompanying calculations. The problem series uses the same material properties, so the impact of the elastic and thermal expansion properties for a single-layer of FR material on the stress, strains, elastic properties, thermal expansion and failure stress of cross-ply and angle-ply symmetric and unsymmetric laminates can be evaluated. The book shows how thermally induced stresses and strains due to curing, add to or subtract from those due to applied loads.Another important element, and one unique to this book, is an emphasis on the difference between specifying the applied loads, i.e., force and moment results, often the case in practice, versus specifying strains and curvatures and determining the subsequent stresses and force and moment results. This represents a fundamental distinction in solid mechanics.
Author: Valter Carvelli Publisher: Elsevier ISBN: 1782422935 Category : Technology & Engineering Languages : en Pages : 511
Book Description
Fatigue of Textile Composites provides a current, state-of-art review on recent investigations on the fatigue behavior of composite materials, mainly those reinforced with textiles. As this particular group of composite materials is extremely important for a wide variety of industrial applications, including automotive, aeronautical, and marine, etc., mainly due to their peculiarities and advantages with respect to unidirectional laminated composites, the text presents comprehensive information on the huge variety of interlacement geometric architectures that are suitable for a broad range of different applications, their excellent drapability and versatility, which is highly important for complex double-curvature shape components and three-dimensional woven fabrics without plane reinforcement, and their main mechanical characteristics which are currently in high demand from industry. Presents the current state-of-the-art investigations on fatigue behavior of composite materials, mainly those reinforced with textiles Contains invaluable information pertaining to a wide variety of industries, including automotive, aeronautical, and marine, amongst others Provides comprehensive information on the huge variety of interlacement geometric architectures that are suitable for a broad range of different applications
Author: Rikard Benton Heslehurst Publisher: CRC Press ISBN: 146658047X Category : Technology & Engineering Languages : en Pages : 216
Book Description
The advantages of composite materials include a high specific strength and stiffness, formability, and a comparative resistance to fatigue cracking and corrosion. However, not forsaking these advantages, composite materials are prone to a wide range of defects and damage that can significantly reduce the residual strength and stiffness of a structure or result in unfavorable load paths. Emphasizing defect identification and restitution, Defects and Damage in Composite Materials and Structures explains how defects and damage in composite materials and structures impact composite component performance. Providing ready access to an extensive, descriptive list of defects and damage types, this must-have reference: Examines defect criticality in composite structures Recommends repair actions to restore structural integrity Discusses failure modes and mechanisms of composites due to defects Reviews NDI processes for finding and identifying defects in composite materials Relating defect detection methods to defect type, the author merges his experience in the field of in-service activities for composite airframe maintenance and repair with indispensable reports and articles on defects and damage in advanced composite materials from the last 50 years.
Author: S. R. Reid Publisher: Elsevier ISBN: 1855738902 Category : Technology & Engineering Languages : en Pages : 318
Book Description
This study covers impact response, damage tolerance and failure of fibre-reinforced composite materials and structures. Materials development, analysis and prediction of structural behaviour and cost-effective design all have a bearing on the impact response of composites and this book brings together for the first time the most comprehensive and up-to-date research work from leading international experts. State of the art analysis of impact response, damage tolerance and failure of FRC materials Distinguished contributors provide expert analysis of the most recent materials and structures Valuable tool for R&D engineers, materials scientists and designers
Author: Alejandro Rodríguez Puig
Author: Alejandro Rodríguez Puig
Author: John Jerome Davis
Author: Emile Greenhalgh
Author: Rani Elhajjar
Author: Michael William Lerman
Author: M. W. Hyer
Author: Valter Carvelli
Author: Rikard Benton Heslehurst
Author: Hao-Ming Hsiao
Author: S. R. Reid