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Damage Tolerance Of Composite Laminates From An Empirical Perspective
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Book Synopsis Damage Tolerance of Composite Laminates from an Empirical Perspective by : Alan T. Nettles
Download or read book Damage Tolerance of Composite Laminates from an Empirical Perspective written by Alan T. Nettles and published by BiblioGov. This book was released on 2013-06 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents. This slide presentation reviews the damage tolerance for composite laminates. It includes information surrounding observations on impact testing, laminate damage threshold, and fatigue.
Book Synopsis A Comprehensive Study on Damage Tolerance Properties of Notched Composite Laminates by : A. S. Wang
Download or read book A Comprehensive Study on Damage Tolerance Properties of Notched Composite Laminates written by A. S. Wang and published by . This book was released on 1988 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report contains the results of an investigation on matrix-related damage mechanisms in notched composite laminates. The theoretical approach taken follows the principles of micromechanisms and the mechanics of brittle fracture at the descriptive level considered valid for the so-called ply-elasticity. Namely, the laminate is basically treated as a 3-dimensional elastic solid which is made of distinctly anisotropic layers. Brittle fracture can initiate and propagate within any layer having a weaker axis of material anisotropy, and within any one of the weaker layer interfaces due to the 3-dimensional interlaminar stresses. Owing to the particular microstructure of the laminate, growth of such sublaminate cracks constitutes a load- or time-dependent evolutionary process. A computer simulation methodology is developed to describe the modes and the extent of damage caused initially by the presence of the notch, and subsequently by the damages themselves. Experiment using a graphite-epoxy laminate is then conducted to validate the simulation results. Keywords: Graphite epoxy laminates, Notches, Holes, Stress concentration, Matrix cracks, Mixed modes, Crack growth, Finite element fracture mechanics.
Book Synopsis Characterization and Analysis of Damage Progression in Non-traditional Composite Laminates with Circular Holes by : Paul James Treasurer
Download or read book Characterization and Analysis of Damage Progression in Non-traditional Composite Laminates with Circular Holes written by Paul James Treasurer and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Fiber / Epoxy Laminates are increasingly being used in the primary structure of aircraft. To make effective use these materials, it is necessary to consider the ability of a laminate to resist damage, as well as material strength and stiffness. A possible means for improving damage tolerance is the use of non-traditional composite laminates, in which the longitudinal 0 plies are replaced with 5 or 10 plies. The main objectives of this collaborative Georgia Tech / Boeing research was the characterization of these non-traditional laminates, and the determination of appropriate lamina-level analytical techniques that are capable of predicting the changes caused by the use of slightly off-axis longitudinal plies. A quasi-isotropic [45/90/-45/theta/45/90/-45/-theta]s and hard [45/theta/-45/theta/90/45]s lay-up, where theta =0,5 or 10, were tested in open hole tension, filled hole tension, open hole compression, single shear bearing, and unnotched tension. These coupon level tests illustrated the effects of lay-up, notch constraint, and load type on traditional and non-traditional laminates. Die penetrant enhanced in-situ radiography was performed to determine the extent of damage suppression. The use of non-traditional laminates was found to reduce longitudinal ply cracking and delamination, with significant effect on the stress distribution around the notch. The use of non-traditional laminates also resulted in a 15%-20% improvement in bearing strength of the traditional laminates. Several predictive techniques were implemented to evaluate their ability to predict the effect of slight changes in ply orientations. A progressive damage model was written to compare Tsai-Wu, Hashin, and Maximum Stress unnotched strength criterion. Additionally, several semi-empirical failure theories for notched strength prediction were compared with linear and bi-linear cohesive zone models to determine applicability to non-traditional laminates.
Book Synopsis Fatigue and Damage Tolerance Analysis of Composite Laminates - Stiffness Loss, Damage Modellig, and Life Prediction by : Bangyan Liu
Download or read book Fatigue and Damage Tolerance Analysis of Composite Laminates - Stiffness Loss, Damage Modellig, and Life Prediction written by Bangyan Liu and published by . This book was released on 1992 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The prediction of fatigue life and evaluation of onset and growth of matrix cracks and delamination for general composite laminates are studied analytically using theories of damage tolerance, residual modulus degradation and residual strength degradation. Damage onset including matrix cracks and edge delamination are predicted by using a total strain energy release rate criterion which accounts for interactive effects of matrix cracks and delamination. The analytical models for modulus degradation, matrix crack density and delamination size growth as function of fatigue stress and fatigue cycles are proposed. The proposed approach provides four choices for predicting tension-tension fatigue life and for assessing fail-safety for structures made of composite laminates. The direct relation of physical damage to fatigue life and analytical equations for calculating residual elastic moduli E[symbol] and G[symbol] in terms of fatigue load and fatigue cycles are proposed. The proposed approach enables prediction of fatigue behaviour of general laminates using experimental data of a basic lay-up such as unidirectional laminate. The finite element technique was utilized to model the fatigue failure process of notched laminates. A simple example of a laminate with a central hole under tension-tension fatigue loading was performed." --
Book Synopsis Towards a Damage Tolerance Philosophy for Composite Materials and Structures by :
Download or read book Towards a Damage Tolerance Philosophy for Composite Materials and Structures written by and published by . This book was released on 1988 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates. Volume I: Theoretical Manual by :
Download or read book RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates. Volume I: Theoretical Manual written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of composite material systems in structural design has yielded significant improvements in material efficiency by minimizing weight while meeting static and dynamic strength requirements. The complexity of composite materials, however, has presented a spectrum of additional design considerations in the areas of fabrication, strength tailoring, failure mechanisms, and damage tolerance. Laminated composites exhibit a variety of damage and failure modes which include matrix cracking, fiber breakage, delamination propagation, and instability. Of prime concern is the predication of residual strength in composite structures subjected to damage-causing impact threats in the intended service environment. The present effort aims to account for many of the salient damage mechanisms utilizing a numerical, finite element-based approach. Such an approach permits a broad range of failure modes to be accounted for while allowing the modeling of complex geometries, support conditions, and applied loading. This report details the theoretical and algorithmic basis of a developed computer program denoted RESTRAN (REsidual STRength ANalysis), incorporating both material and structural failure modes in the prediction of residual strength in composite structures containing internal damage.
Book Synopsis Post-impact Fatigue Behavior of Composite Laminates by : Alkis Paipetis
Download or read book Post-impact Fatigue Behavior of Composite Laminates written by Alkis Paipetis and published by . This book was released on 2010 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates by : Erik Saether
Download or read book RESTRAN: Residual Strength Analysis of Impact Damaged Composite Laminates written by Erik Saether and published by . This book was released on 2001-07-01 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of composite material systems in structural design has yielded significant improvements in material efficiency by minimizing weight while meeting static and dynamic strength requirements. The complexity of composite materials, however, has presented a spectrum of additional design considerations in the areas of fabrication, strength tailoring, failure mechanisms, and damage tolerance. Laminated composites exhibit a variety of damage and failure modes which include matrix cracking, fiber breakage, delamination propagation, and instability. Of prime concern is the predication of residual strength in composite structures subjected to damage-causing impact threats in the intended service environment. The present effort aims to account for many of the salient damage mechanisms utilizing a numerical, finite element- based approach. Such an approach permits a broad range of failure modes to be accounted for while allowing the modeling of complex geometries, support conditions, and applied loading. This report details the theoretical and algorithmic basis of a developed computer program denoted RESTRAN (REsidual STRength ANalysis), incorporating both material and structural failure modes in the prediction of residual strength in composite structures containing internal damage.
Book Synopsis Damage Tolerance of Composite Laminates Under Static and Alternating Loads by : Benjamin Steven Prober
Download or read book Damage Tolerance of Composite Laminates Under Static and Alternating Loads written by Benjamin Steven Prober and published by . This book was released on 1988 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polymer Composites in the Aerospace Industry by : P. E. Irving
Download or read book Polymer Composites in the Aerospace Industry written by P. E. Irving and published by Elsevier. This book was released on 2014-09-17 with total page 537 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymer composites are increasingly used in aerospace applications due to properties such as strength and durability compared to weight. Edited by two leading authorities in the field, this book summarises key recent research on design, manufacture and performance of composite components for aerospace structures. Part one reviews the design and manufacture of different types of composite component. Part two discusses aspects of performance such as stiffness, strength, fatigue, impact and blast behaviour, response to temperature and humidity as well as non-destructive testing and monitoring techniques.
Book Synopsis Composite Materials by : Samuel P. Garbo
Download or read book Composite Materials written by Samuel P. Garbo and published by ASTM International. This book was released on 1990 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Papers from the symposium held April 1988 in Sparks, Nevada. The focus is on significant advances in the area of damage tolerance and durability of composite structures. Twenty-seven contributions address delamination initiation and growth analysis, damage mechanisms and test procedures, and other general interest design and analysis topics. Annotation copyrighted by Book News, Inc., Portland, OR.
Book Synopsis Impact Damage Tolerance of a Carbon Fibre Composite Laminate by : G. Dorey
Download or read book Impact Damage Tolerance of a Carbon Fibre Composite Laminate written by G. Dorey and published by . This book was released on 1984 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was carried out, under the auspices of GARTEUR, at four European aerospace research establishments as the first phase of a collaborative research programme on impact damage tolerance of composite materials. Laminates, from a common batch of material having a 0 90 -+ 45 0 s lay up, were impacted by dropweight and residual strengths were measured under fully reversed loading for specimens containing barely visible impact damage. The impact damage significantly reduced the static compressive strength but subsequent fatigue loading produced little further reduction in strength and the fatigue strength at 10 to the 6th power cycles was similar to that for non impacted specimens. All four establishments produced similar results and in Phase 2 they will study in more detail a wider range of materials and test parameters. Keywords: Carbon fibre, Composite material, Impact, Fatigue, Residual strength, Barely visible impact damage.
Book Synopsis Low Velocity Edge Impact on Composite Laminates by : Anjum Malhotra
Download or read book Low Velocity Edge Impact on Composite Laminates written by Anjum Malhotra and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strain Rate Effects on Tensile Fracture and Damage Tolerance of Composite Laminates by : Yew-Poh Mak
Download or read book Strain Rate Effects on Tensile Fracture and Damage Tolerance of Composite Laminates written by Yew-Poh Mak and published by . This book was released on 1992 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delamination Damage Tolerance of Composite Laminate Exposed to Hygro-thermal Cyclic Loading by : Mohammod Khairul Kabir Bhuyan
Download or read book Delamination Damage Tolerance of Composite Laminate Exposed to Hygro-thermal Cyclic Loading written by Mohammod Khairul Kabir Bhuyan and published by . This book was released on 2004 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact Damage and Damage Tolerance of Fibre Reinforced Advanced Composite Laminate Structures by : James C. Lloyd
Download or read book Impact Damage and Damage Tolerance of Fibre Reinforced Advanced Composite Laminate Structures written by James C. Lloyd and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Modelling of Composite Materials and Structures by : F L Matthews
Download or read book Finite Element Modelling of Composite Materials and Structures written by F L Matthews and published by Elsevier. This book was released on 2000-10-27 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Finite element modelling of composite materials and structures provides an introduction to a technique which is increasingly being used as an analytical tool for composite materials.The text is presented in four parts: Part one sets the scene and reviews the fundamentals of composite materials together with the basic nature of FRP and its constituents. Two-dimensional stress-strain is covered, as is laminated plated theory and its limitations. Part two reviews the basic principles of FE analysis, starting with underlying theoretical issues and going on to show how elements are derived, a model is generated and results are processed. Part three builds on the basics of FE analysis and considers the particular issues that arise in applying finite elements to composites, especially to the layered nature of the material. Part four deals with the application of FE to FRP composites, presenting analytical models alongside FE representations. Specific issues addressed include interlaminar stresses, fracture delamination, joints and fatigue. This book is invaluable for students of materials science and engineering, and for engineers and others wishing to expand their knowledge of structural analysis. Covers important work on finite element analysis of composite material performance Based on material developed for an MSc course at Imperial College, London, UK Covers particular problems such as holes, free edges with FE results compared with experimental data and classical analysis
