December 3, 2020

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Bonded Joints and Repairs to Composite Airframe Structures

Bonded Joints and Repairs to Composite Airframe Structures
Author : Chun Hui Wang,Cong N. Duong
Publisher : Academic Press
Release Date : 2015-10-10
Category : Technology & Engineering
Total pages :306
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Bonded Joints and Repairs to Composite Airframe Structures is a single-source reference on the state-of-the-art in this rapidly growing area. It provides a thorough analysis of both internal and external joints and repairs, as well as discussions on damage tolerance, non-destructive inspection, self-healing repairs, and other essential information not only on the joints and repairs themselves, but critically, on how they differ from bonds and repairs to metallic aircraft. Authors Wang and Duong bring a valuable combination of academic research and industry expertise to the book, drawing on their cutting-edge composite technology experience, including analytic and computational leadership of damage and repair planning for the Boeing 787. Intended for graduate students, engineers, and scientists working on the subject in aerospace industry, government agencies, research labs, and academia, the book is an important addition to the limited literature in the field. Offers rare coverage of composite joints and repairs to composite structures, focusing on the state of the art in analysis Combines the academic, government, and industry expertise of the authors, providing research findings in the context of current and future applications Covers internal and external joints and repairs, as well as damage tolerance, non-destructive inspection, and self-healing repairs Ideal for graduate students, engineers, and scientists working in the aerospace industry, government agencies, research labs, and academia

Recent Advances in Structural Joints and Repairs for Composite Materials

Recent Advances in Structural Joints and Repairs for Composite Materials
Author : Liyong Tong,C. Soutis
Publisher : Springer Science & Business Media
Release Date : 2013-03-09
Category : Technology & Engineering
Total pages :254
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Joints in components or structures incur a weight penalty, are a source of failure, cause manufacturing problems, and are unfortunately unavoidable in most structures ranging from aircraft, and spacecraft to ships and offshore platforms, to automobiles, bridges and buildings. An important requirement for the complete design of practical structures is the development of attachment methods and joint designs. Recent Advances in Structural Joints and Repairs for Composite Materials provides an up-to-date account of adhesively bonded and mechanically fastened joints and repairs. Audience: This book will prove to be an informative resource for all engineers and researchers involved with joining and repair of composite structures.

Advances in the Bonded Composite Repair of Metallic Aircraft Structure

Advances in the Bonded Composite Repair of Metallic Aircraft Structure
Author : A.A. Baker,L.R.F. Rose,Rhys Jones
Publisher : Elsevier
Release Date : 2003-01-23
Category : Technology & Engineering
Total pages :1122
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The availability of efficient and cost-effective technologies to repair or extend the life of aging military airframes is becoming a critical requirement in most countries around the world, as new aircraft becoming prohibitively expensive and defence budgets shrink. To a lesser extent a similar situation is arising with civil aircraft, with falling revenues and the high cost of replacement aircraft. This book looks at repair/reinforcement technology, which is based on the use of adhesively bonded fibre composite patches or doublers and can provide cost-effective life extension in many situations. From the scientific and engineering viewpoint, whilst simple in concept, this technology can be quite challenging particularly when used to repair primary structure. This is due to it being based on interrelated inputs from the fields of aircraft design, solid mechanics, fibre composites, structural adhesive bonding, fracture mechanics and metal fatigue. The technologies of non-destructive inspection (NDI) and, more recently smart materials, are also included. Operational issues are equally critical, including airworthiness certification, application technology (including health and safety issues), and training. Including contributions from leading experts in Canada, UK, USA and Australia, this book discusses most of these issues and the latest developments. Most importantly, it contains real histories of application of this technology to both military and civil aircraft.

Bonded Repair of Aircraft Structures

Bonded Repair of Aircraft Structures
Author : A. Baker,Jones
Publisher : Springer Science & Business Media
Release Date : 1988-05-31
Category : Technology & Engineering
Total pages :214
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The conventional approach to through-life-support for aircraft structures can be divided into the following phases: (i) detection of defects, (ii) diagnosis of their nature and significance, (iii) forecasting future behaviour-prognosis, and (iv) pre scription and implementation of remedial measures including repairs. Considerable scientific effort has been devoted to developing the science and technology base for the first three phases. Of particular note is the development of fracture mechanics as a major analytical tool for metals, for predicting residual strength in the presence of cracks ( damage tolerance) and rate of crack propagation under service loading. Intensive effort is currently being devoted to developing similar approaches for fibre composite structures, particularly to assess damage tolerance and durability in the presence of delamination damage. Until recently there has been no major attempt to develop a science and tech nology base for the last phase, particularly with respect to the development of repairs. Approaches are required which will allow assessment of the type and magnitude of defects amenable to repair and the influence of the repair on the stress intensity factor (or some related parameter). Approaches are also required for the development and design of optimum repairs and for assessment of their durability.

Aircraft Sustainment and Repair

Aircraft Sustainment and Repair
Author : Rhys Jones,A.A. Baker,Neil Matthews,V K Champagne
Publisher : Butterworth-Heinemann
Release Date : 2017-12-15
Category : Technology & Engineering
Total pages :970
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Aircraft Sustainment and Repair is a one-stop-shop for practitioners and researchers in the field of aircraft sustainment, adhesively bonded aircraft joints, bonded composites repairs, and the application of cold spray to military and civil aircraft. Outlining the state-of-the-art in aircraft sustainment, this book covers the use of quantitative fractography to determine the in-service crack length versus flight hours curve, the effect of intergranular cracking on structural integrity and the structural significance of corrosion. The book additionally illustrates the potential of composite repairs and SPD applications to metallic airframes. Covers corrosion damage assessment and management in aircraft structures Includes a key chapter on U.S. developments in the emerging field of supersonic particle deposition (SPD) Shows how to design and assess the potential benefits of both bonded composite repairs and SPD repairs to metallic aircraft structures to meet the damage tolerance requirements inherent in FAA ac 20-107b and the U.S. Joint Services

Composite Materials for Aircraft Structures

Composite Materials for Aircraft Structures
Author : Alan A. Baker
Publisher : AIAA
Release Date : 2004
Category : Airplanes
Total pages :599
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Composite Repair

Composite Repair
Author : Cong N. Duong,Chun Hui Wang
Publisher : Elsevier
Release Date : 2010-07-07
Category : Science
Total pages :480
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Bonded composite repairs are efficient and cost effective means of repairing cracks and corrosion grind-out cavity in metallic structures, and composite structures sustained impact and ballistic damages, especially in aircraft structures. This book grew out of the recent research conducted at the Boeing Company and the Defence Science and Technology Organisation (DSTO, Australia) over the past ten years. Consequently it is predominately a compilation of the work by the authors and their colleagues at these two organizations on the design and analysis of composite repairs. Composite Repair is entirely devoted to the design and analysis of bonded repairs, focusing on the mathematical techniques and analysis approaches that are critical to the successful implementation of bonded repairs. The topics addressed are presentated in a sufficiently self-explanatory manner, and serve as a state-of-the-art reference guide to engineers, scientists, researchers and practitioners interested in the underpinning design methodology and the modelling of composite repairs. The only book devoted entirely to the design and analysis of bonded repairs Focusing on mathematical techniques and analytical methodologies that are critical to the successful implementation of bonded repair A companion reference book to the United Stated Air Force (USAF) bonded repair guidelines (Guidelines for Composite Repair of Metallic Structures-CRMS, AFRL-WP-TR-1998-4113) and the Royal Australian Air Force (RAAF) Design Standard DEF(AUST)995 Covering a variety of topics and effects: repairs of fatigue and sonic fatigue cracks, and corrosion grind-out cavity, and effects of secondary bending, octagon-shaped patches, thermal residual stresses, patches in proximity, patch tapering edge, etc.

Composite Airframe Structures

Composite Airframe Structures
Author : Chunyun Niu,Michael Chun-Yung Niu
Publisher : Adaso Adastra Engineering Center
Release Date : 1992
Category : Airframes
Total pages :664
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Engineered Repairs of Composite Structures

Engineered Repairs of Composite Structures
Author : Rikard Benton Heslehurst
Publisher : CRC Press
Release Date : 2019-04-10
Category : Technology & Engineering
Total pages :218
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Engineered Repairs of Composite Structures provides a detailed discussion, analysis, and procedures for effective and efficient repair design of advanced composite structures. It discusses the identification of damage types and the effect on structural integrity in composite structures, leading to the design of a repair scheme that focusses on the restoration of the structural integrity and damage tolerance. This book teaches the reader to better understand effective and efficient repair design, allowing for more structurally effective repairs of damaged composite structures. It also discusses the application of the repair and what is needed in the forming of the composite repair to meet the engineering design requirements. Aimed at materials engineers, mechanical engineers, aerospace engineers, and civil engineers, this practical work is a must have for any industry professional working with composite structures.

Composite Repair

Composite Repair
Author : Cong N. Duong,Chun Hui Wang
Publisher : Elsevier Science Limited
Release Date : 2007-07-23
Category : Science
Total pages :463
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Bonded composite repairs are efficient and cost effective means of repairing cracks and corrosion grind-out cavity in metallic structures, and composite structures sustained impact and ballistic damages, especially in aircraft structures. This book grew out of the recent research conducted at the Boeing Company and the Defence Science and Technology Organisation (DSTO, Australia) over the past ten years. Consequently it is predominately a compilation of the work by the authors and their colleagues at these two organizations on the design and analysis of composite repairs. Composite Repair is entirely devoted to the design and analysis of bonded repairs, focusing on the mathematical techniques and analysis approaches that are critical to the successful implementation of bonded repairs. The topics addressed are presentated in a sufficiently self-explanatory manner, and serve as a state-of-the-art reference guide to engineers, scientists, researchers and practitioners interested in the underpinning design methodology and the modelling of composite repairs. The only book devoted entirely to the design and analysis of bonded repairs Focusing on mathematical techniques and analytical methodologies that are critical to the successful implementation of bonded repair A companion reference book to the United Stated Air Force (USAF) bonded repair guidelines (Guidelines for Composite Repair of Metallic Structures-CRMS, AFRL-WP-TR-1998-4113) and the Royal Australian Air Force (RAAF) Design Standard DEF(AUST)995 Covering a variety of topics and effects: repairs of fatigue and sonic fatigue cracks, and corrosion grind-out cavity, and effects of secondary bending, octagon-shaped patches, thermal residual stresses, patches in proximity, patch tapering edge, etc.

Joining Composites with Adhesives

Joining Composites with Adhesives
Author : Magd Abdel Wahab
Publisher : DEStech Publications, Inc
Release Date : 2015-10-05
Category : Technology & Engineering
Total pages :324
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Adhesive technologies for bonding composites to multiple materialsInformation on adhesive formulation, selection, joint configuration Presented in this volume is a detailed scientific analysis of strategies for adhering composite materials to plastics, concrete, metals, and wood, as well as to other composites, using a variety of adhesives. The theory and analysis of composite bonding with adhesives are explained, along with information on adhesive formulation and selection, material preparation, joint geometry and joint design. Attention is given to how different types of adhered composite joints are empirically tested, e.g., for strength and under stress, and how models of joints with adhesives are developed. The book includes an intensive discussion of the uses of adhesives for composite repair. Part two focuses on applications of adhesive composite bonding in aircraft, automobiles, buildings, ships, railroads and dental restoration.

Applications of Fracture Mechanics to the Durability of Bonded Composite Joints

Applications of Fracture Mechanics to the Durability of Bonded Composite Joints
Author : W. Steven Johnson
Publisher : Unknown
Release Date : 1998
Category : Adhesive joints
Total pages :52
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The increased numbers of bonded composite components and bonded repairs of cracked structures make knowledge of adhesive bonding crucial to aircraft design and life extension. This report covers an effort which focused on using fracture mechanics to evaluate the Mode I fracture and fatigue properties of several adhesively bonded aerospace material systems. The research concentrated on bond line cracking rather than fatigue crack growth in composite or metal adherends. Particular attention was paid to the environmental durability of bonded systems in use or intended for use on transport, fighter, and supersonic aircraft. Analysis was performed using closed-form solutions as well as finite element analyses. Results were discussed with respect to their relevance and applicability to bonded joint design. Key results include the identification of significant degradation in some varieties of bonded joints subjected to long-term isothermal exposure under hot/wet conditions. The degradation was manifested by decreased fracture toughness and fatigue threshold levels. Finite element analyses were performed on specimens with dissimilar adherends having complex geometries and thermally induced stresses in the bond line. A case study in which finite element analyses were used to relate the experimental results from this program with those of an independent project is also included. The analyses highlight the importance of using tapered adherends to avoid fatigue failures and show that typical aircraft skin stresses are below experimentally obtained threshold values for the specimen geometries investigated. Results of this study emphasize that the environmental durability of adhesively bonded joints is a key issue which must be considered by aerospace design engineers.

Study of Adhesively Bonded Repairs in Aircraft CFRP Primary Structures

Study of Adhesively Bonded Repairs in Aircraft CFRP Primary Structures
Author : Aris Khechen
Publisher : Unknown
Release Date : 2015
Category :
Total pages :84
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This master's degree thesis focuses on testing and modeling the bonded scarf-stepped composite joint performance under uniaxial tensile loading as part of the effort to develop testing protocols and analytical tools for the design of scarf bonded repair for primary aeronautical composite structures. First, plain weave (PW) and 8-harness satin (8-HS) carbon fiber-reinforced plastic (CFRP) pre-preg composite materials were tested under uniaxial tensile loading at room temperature dry (RTD) and elevated temperature dry (ETD) conditions. The gathered characterization data was later used for the numerical modeling of the repairs. Furthermore, smoothed parent laminate bonding surface and stepped patch laminate bonding surface (scarf-stepped repairs were performed using both PW and 8-HS composite materials with matching quasi-isotropic ([+45°/0°/-45°/90°]2s) ply stacking sequence between the parent and the patch. The adhesive film that was used is the Cytec FM300-2M. The effects of environmental conditions and the influence of the scarf angle (i.e. 3 ̊, 5.5° and 7.5 ̊) on the performance of the bonded repairs were investigated. The tensile test results revealed that the scarf angle has a significant impact on the failure mode of the repaired composite part. While substrate failure occurred with a 3 ̊ scarf angle, cohesive shear failure was observed for the 5.5° and 7.5 ̊ angles. This change in failure mode is consistent both at RTD and ETD. When compared with the pristine laminate, an insignificant drop in stiffness was found regardless of the scarf angle. Although, increasing the scarf angle led to a significant drop in strength restitution in comparison with the pristine laminate. This indicates the importance of the scarf angle on the structural integrity of a scarf-step bonded repair. The tensile test results in ETD conditions suggest a slight decrease in stiffness and strength for both materials at ETD. Eventually, 2D through-thickness finiteelement analyses were also conducted using both ABAQUS Standard and Explicit. An elastic analysis was first performed to predict the distribution of normalized shear and peel stresses in the middle of the adhesive along the bondline for three different joint geometries (scarf-scarf, scarf-step and step-step). As opposed to the uniform stress distributions found along the bondline of the scarf-scarf configuration, high and frequent peaks of peal and shear stresses were found for both scarf-step and step-step configurations. These observations led to the conclusion that one must be particularly cautious when modeling a scarf joint bonded repair. Assuming that the patch laminate bonding surface is smoothed (i.e., scarf-scarf configuration) while it is actually stepped (i.e., scarf-step configuration) can lead to overestimating the overall repair strength since the high stress peaks caused by the geometric irregularities of the stepped patch laminate bonding surface would then be ignored. Furthermore, an elastic-plastic analysis was conducted using the already implemented plasticity and shear damage models in ABAQUS. These plasticity and damage models were used for the adhesive film only. The composite material was supposed to behave linear-elastically up to failure. The maximum strain criterion was used to predict the first ply failure in the composite. The predictions obtained with the model correlated very well with the experimental results.

Defects and Damage in Composite Materials and Structures

Defects and Damage in Composite Materials and Structures
Author : Rikard Benton Heslehurst
Publisher : CRC Press
Release Date : 2014-04-21
Category : Technology & Engineering
Total pages :214
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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.

Fatigue and Fracture of Adhesively-Bonded Composite Joints

Fatigue and Fracture of Adhesively-Bonded Composite Joints
Author : A P Vassilopoulos
Publisher : Elsevier
Release Date : 2014-10-21
Category : Technology & Engineering
Total pages :552
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It is commonly accepted that the majority of engineering failures happen due to fatigue or fracture phenomena. Adhesive bonding is a prevailing joining technique, widely used for critical connections in composite structures. However, the lack of knowledge regarding fatigue and fracture behaviour, and the shortage of tools for credible fatigue design, hinders the potential benefits of adhesively bonded joints. The demand for reliable and safe structures necessitates deep knowledge in this area in order to avoid catastrophic structural failures. This book reviews recent research in the field of fatigue and fracture of adhesively-bonded composite joints. The first part of the book discusses the experimental investigation of the reliability of adhesively-bonded composite joints, current research on understanding damage mechanisms, fatigue and fracture, durability and ageing as well as implications for design. The second part of the book covers the modelling of bond performance and failure mechanisms in different loading conditions. A detailed reference work for researchers in aerospace and engineering Expert coverage of different adhesively bonded composite joint structures An overview of joint failure