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Download or read book Investigating the Micromechanisms of Mode II Delamination in Composite Laminates written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Srinivasan Sridharan
Publisher : Elsevier
ISBN 13 : 1845694821
Total Pages : 787 pages
Book Rating : 4.8/5 (456 download)
Download or read book Delamination Behaviour of Composites written by Srinivasan Sridharan and published by Elsevier. This book was released on 2008-10-21 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: Given such advantages as low weight compared to strength and toughness, laminated composites are now used in a wide range of applications. Their increasing use has underlined the need to understand their principal mode of failure, delamination. This important book reviews key research in understanding and preventing delamination. The first part of the book reviews general issues such as the role of fracture mechanics in understanding delamination, design issues and ways of testing delamination resistance. Part two describes techniques for detecting and characterising delamination such as piezoelectric sensors, the use of lamb waves and acoustic emission techniques. The next two sections of the book discuss ways of studying and modelling delamination behaviour. The final part of the book reviews research on delamination behaviour in particular conditions such as shell and sandwich structures, z-pin bridging and resin bonding. With its distinguished editor and international team of contributors, Delamination behaviour of composites is a standard reference for all those researching laminated composites and using them in such diverse applications as microelectronics, aerospace, marine, automotive and civil engineering. Reviews the role of fracture mechanics in understanding delamination, design issues and ways of testing delamination resistance Discuss ways of studying and modelling delamination behaviour A standard reference for all those researching laminated composites
Author : B.P.H. Graftieaux
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.:/5 (11 download)
Download or read book Investigation of Delamination of Z-pinned Composite Laminates Under Mode I and Mode II Cyclic Loading written by B.P.H. Graftieaux and published by . This book was released on 1999 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anne Keiko Magnus
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (112 download)
Download or read book Experimental and Numerical Study of Mode II Delamination in Laminated Composite Beams written by Anne Keiko Magnus and published by . This book was released on 2019 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of laminated composites is becoming increasingly ubiquitous in many industries as this material has a high strength-to-weight ratio, and offers customization and flexibility in design. However, delamination damage, which reduces the strength and stiffness of the material, is common and often difficult to detect during inspection. The integration of delamination failure considerations into the design and analysis process is of the utmost importance, and therefore necessitates experimental characterization of delamination, as well as structural-scale numerical models which accurately predict delamination behavior. In this thesis the end loaded split (ELS) specimen was used to experimentally investigate mode II delamination, which is less well understood than mode I delamination. Force-displacement data was used to characterize the mode II critical strain energy release rate, as well as to study the capabilities of two crack growth models: the virtual crack closure technique (VCCT), and cohesive zone model (CZM). The numerical model results demonstrated good agreement with the experimental test data, however neither the experimentally determined mode II critical strain energy release rates, nor the crack growth simulations were free of size effects. In an effort to establish a more robust material model to characterize mode II delamination, through-thickness displacement field data was analyzed, but was found to lack the resolution necessary to accurately capture cracked, or even uncracked beam behavior.
Author :
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (317 download)
Download or read book Hygrothermal Influence on Delamination Behavior of Graphite/epoxy Laminates written by and published by . This book was released on 1984 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Norbert Blanco
Publisher : VDM Publishing
ISBN 13 : 9783836490436
Total Pages : 304 pages
Book Rating : 4.4/5 (94 download)
Download or read book Variable Mixed-mode Fatigue Delamination in Composite Laminates written by Norbert Blanco and published by VDM Publishing. This book was released on 2008 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue is a key factor for durable designs of composite structures. Delamination is the most important damage mechanisms for these materials. In many composite components delaminations grow under a varying mode mix that depends on the crack length. It is important to develop methods that can characterise subcritical, mixed-mode growth in fatigue delamination. The objective of this investigation is the characterisation of variable mixed-mode fatigue delamination in composite laminates. A mixed-mode fatigue delamination model is proposed. Opposite to literature mixed-mode fatigue delamination models, the proposed model assumes a non-monotonic variation of the propagation parameters with the mode mix. The mixed-mode end load split (MMELS) test, in which the propagation mode varies with the crack extent, is analysed. Two theoretical approaches present in the literature are considered. However, the resulting expressions are not equivalent and a more accurate alternative analysis is carried out based on the virtual crack closure technique. Significant findings are found for materials characterisation.
Author : Kevin T. O'Brien
Publisher :
ISBN 13 :
Total Pages : 80 pages
Book Rating : 4.F/5 ( download)
Download or read book Mixed-mode Strain-energy-release Rate Effects on Edge Delamination of Composites written by Kevin T. O'Brien and published by . This book was released on 1983 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wei Ding
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)
Download or read book Delamination Analysis of Composite Laminates written by Wei Ding and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A combined theoretical and experimental study has been conducted on the delamination of fibre reinforced polymeric composites. The main objectives were to gain a better understanding of the physical origin of delamination fracture toughness and to develop theoretical models to predict the critical strain energy release rates of delamination in composite materials. Of the many energy dissipation mechanisms present in the delamination process, crack tip plastic deformation was determined to be the most critical one. Two analytical beam models, based on the double cantilever beam (DCB) specimen and the end notched flexure (ENF) specimen, were developed. A fracture criterion, based on the size of the crack tip plastic zone, was incorporated into these beam models so that the mode I and mode II critical strain energy release rates of composites can be predicted using the corresponding resin and fibre properties as well as composite structural parameters. A complete set of mechanical tests were performed on five polymeric composite systems, including both thermoset and thermoplastic systems, and on their corresponding neat polymer resins. The theoretical predictions for delamination fracture toughness from the present analytical models agreed very well with the data obtained in the present experiments and those in the literature over a wide range of composite laminates.
Author :
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (227 download)
Download or read book Studies of Mode I and Mode II Delamination Using a J-Integral Analysis and In-Situ Observations of Fracture in the SEM. written by and published by . This book was released on 1990 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mode I and II delamination of multi-directional composite laminates have been studied using a J-integral approach. The analytical and experimental formalism to apply the J-integral to delamination have been developed and verified on three different composite material systems with matrix toughness varying from very brittle to very tough. Large deflections and rotations, midplane straining and distributed damage are taken into account in the methodology. The experimental conditions under which a path independent J may be measured have been established. The effect of several variables including specimen geometry, stacking sequence, and material constitutive behavior on the J-Moment-at-the-crack-tip relationship have been determined. Multidirectional composite laminates are both more susceptible to far field damage in the off- axis plies and less stiff than undirectional layups. These two factors cause a greater tendency to geometric and material nonlinearity in delamination testing. The use of a traditional G approach to characterize fracture behavior of such laminates gives artificially high indications of the delamination resistance.
Author : Emile Greenhalgh
Publisher : Elsevier
ISBN 13 : 1845696816
Total Pages : 608 pages
Book Rating : 4.8/5 (456 download)
Download or read book Failure Analysis and Fractography of Polymer Composites written by Emile Greenhalgh and published by Elsevier. This book was released on 2009-09-28 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Mikael Staal Axelsen
Publisher :
ISBN 13 :
Total Pages : 119 pages
Book Rating : 4.:/5 (472 download)
Download or read book Investigation of Delamination of Composite Laminates written by Mikael Staal Axelsen and published by . This book was released on 1992 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (317 download)
Download or read book An Evaluation of Mixed-mode Delamination Failure Criteria written by and published by . This book was released on 1992 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : RH. Martin
Publisher :
ISBN 13 :
Total Pages : 27 pages
Book Rating : 4.:/5 (125 download)
Download or read book Delamination Onset in Polymeric Composite Laminates Under Thermal and Mechanical Loads written by RH. Martin and published by . This book was released on 1993 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes a fracture mechanics damage methodology to predict edge delamination. The methodology accounts for residual thermal stresses, cyclic thermal stresses, and cyclic mechanical stresses. The modeling is based on the classical lamination theory and a sublaminate theory. The prediction methodology determines the strain energy release rate, G, at the edge of a laminate and compares it with the mode I fatigue and fracture toughness of the composite. To verify the methodology, isothermal static tests at 23°C, 125°C, and 175°C and tension-tension fatigue tests at 23°C and 175°C were conducted on laminates. The material system used was a carbon/bismaleimide, IM7/5260. Two quasi-isotropic lay-ups were used, [45/-45/0/90]s and [-45/45/90/0]s. Also, 24-ply unidirectional double cantilever beam specimens were tested to determine the fatigue and fracture toughness of the composite at different temperatures. Raising the temperature had the effect of decreasing the value of G at the edge for these lay-ups and also to lower the fatigue and fracture toughness of the composite. Experimentally, the static stress to edge delamination was not affected by temperature but the number of cycles to edge delamination decreased as temperature increased. The ply interface for delamination was well predicted. The predicted static stress and the number of cycles to edge delamination was generally conservative for the room temperature tests because of the large mode II G component present. For the elevated temperature tests the mode II component is smaller and the static stress and number of cycles to the onset to delamination was generally well predicted.
Author : M. Hojo
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)
Download or read book Mode I and Mode II Delamination Growth of Interlayer Toughened Carbon/Epoxy (T800H/3900-2) Composite System written by M. Hojo and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delamination is one of the most critical failure modes in a laminated composite structure. In order to improve the interlaminar fracture toughness, the concept of "interlayer" has been applied to thermoset composite materials. In the present paper, the static and fatigue interlaminar fracture characteristics of a interlayer toughened carbon/epoxy, T800H/3900-2, were examined and compared with those of a thermoplastic composite, APC2, as a reference.
Author :
Publisher :
ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.:/5 (317 download)
Download or read book Convergence of Strain Energy Release Rate Components for Edge-delaminated Composite Laminates written by and published by . This book was released on 1987 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : I.H. Marshall
Publisher : Springer
ISBN 13 :
Total Pages : 872 pages
Book Rating : 4.3/5 (91 download)
Download or read book Composite Structures written by I.H. Marshall and published by Springer. This book was released on 1991-09-30 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers contained herein were presented at the Sixth International Conference on Composite Structures (ICCS/6) held at Paisley College, Scotland in September 1991. The Conference was organised and sponsored by Paisley College. It was co-sponsored by Scottish Enterprise, the National Engineering Laboratory, the US Army Research, Development and Standardisation Group-UK, Strathclyde Regional Council and Renfrew District Council. It forms a natural and ongoing progression from the highly successful ICCS/1/2/3/4 and 5 held at Paisley in 1981, 1983, 1985, 1987 and 1989 respectively. As we enter the final decade of this century many organisations throughout the world are adopting a prophetic role by attempting to forecast future scientific advances and their associated impact on mankind. Although some would argue that to do so is folly, without such futuristic visionaries the world would be that much poorer. IntelJigent speculation based on research trends and historical advances, rather than fanciful theories, breathes a healthy air of enthusiasm into the scientific community. Surely this is the very oxygen necessary to ignite the fir~s of innovation and invention amongst pioneers of research.
