Characterization Of Delamination Onset And Growth In A Composite Laminate

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Characterization of Delamination Onset and Growth in a Composite Laminate

Author : TK. O'Brien
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Characterization of Delamination Onset and Growth in a Composite Laminate by : TK. O'Brien

Download or read book Characterization of Delamination Onset and Growth in a Composite Laminate written by TK. O'Brien and published by . This book was released on 1982 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The onset and growth of delaminations in unnotched [±30/±30/90/90 ̄]s graphite-epoxy laminates is described quantitatively. These laminates, designed to delaminate at the edges under tensile loads, were tested and analyzed. Delamination growth and stiffness loss were monitored nondestructively. Laminate stiffness decreased linearly with delamination size. The strain energy release rate, G, associated with delamination growth, was calculated from two analyses. A critical G for delamination onset was determined, and then was used to predict the onset of delaminations in [+45n/-45n/0n/90n]s (n = 1,2,3) laminates. A delamination resistance curve (R-curve) was developed to characterize the observed stable delamination growth under quasi-static loading. A power law correlation between G and delamination growth rates in fatigue was established.

Characterization of Delamination Onset and Growth in a Composite Laminate

Author :
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Characterization of Delamination Onset and Growth in a Composite Laminate by :

Download or read book Characterization of Delamination Onset and Growth in a Composite Laminate written by and published by . This book was released on 1981 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Damage in Composite Materials

Author : K. Reifsnider
Publisher : ASTM International
ISBN 13 : 9780803106963
Total Pages : 298 pages
Book Rating : 4.1/5 (69 download)

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Book Synopsis Damage in Composite Materials by : K. Reifsnider

Download or read book Damage in Composite Materials written by K. Reifsnider and published by ASTM International. This book was released on 1982 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior

Author : T. Kevin O'Brien
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior by : T. Kevin O'Brien

Download or read book Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior written by T. Kevin O'Brien and published by . This book was released on 1984 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: An equation was derived for the strain energy release rate, G, assoicated with local delamination growth from a matrix ply crack. The critical G sub C edge delamination onset in + OR - 25/902s graphite epoxy laminates was measured and used in this equation to predict local delamination onset strains in + OR - 25/90Ns, n =4, 6, b laminates. A simple technique for predicting strain concentrations in the primary load bearing plies near local delaminations was developed. These strain concentrations were responsible for reduced laminate nominal failure strains in laminates containing local delaminates. The influence of edge delamination and matrix crack tip delmaination on laminate stiffness and strength was compared.

Delamination in Advanced Composites

Author : Golam Newaz
Publisher : CRC Press
ISBN 13 :
Total Pages : 508 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Delamination in Advanced Composites by : Golam Newaz

Download or read book Delamination in Advanced Composites written by Golam Newaz and published by CRC Press. This book was released on 1991-02-22 with total page 508 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior

Author : TK. O'Brien
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior by : TK. O'Brien

Download or read book Analysis of Local Delaminations and Their Influence on Composite Laminate Behavior written by TK. O'Brien and published by . This book was released on 1985 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: An equation was derived for the strain-energy release rate, G, associated with local delamination growth from a matrix ply crack. The critical Gc for edge delamination onset in [±25/902]s graphite/epoxy laminates was measured and used in this equation to predict local delamination onset strains in [±25/90n]s, where n = 4, 6, 8 laminates. A simple technique for predicting strain concentrations in the primary load bearing plies near local delaminations was developed. These strain concentrations were responsible for reduced laminate nominal failure strains in laminates containing local delaminations. The influences of edge delamination and matrix crack tip delamination on laminate stiffness and strength were compared.

The Characterization of Edge Delamination Growth in Laminates Under Fatigue Loading

Author : A. Poursartip
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis The Characterization of Edge Delamination Growth in Laminates Under Fatigue Loading by : A. Poursartip

Download or read book The Characterization of Edge Delamination Growth in Laminates Under Fatigue Loading written by A. Poursartip and published by . This book was released on 1987 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is generally accepted that the onset and stable growth of edge delaminations under quasi-static loading can be characterized using the strain energy release rate G and delamination resistance curves (R curves). This study addresses the problem of edge delamination growth under fatigue loading. To characterize the fatigue growth successfully, it is shown that it is not sufficient to consider only the maximum energy (Gmax) released as the delamination grows. Instead, the energy released must be compared to the increasing resistance to further growth. This increasing resistance to delamination grwoth GR can be explained best in terms of the associated matrix cracking, which is observed under both static and fatigue loading. Using results from a [±30/±30/90/9 ̄0]s T300-5208 and a [45/0/-45/90]s XAS-914 graphite-epoxy laminate, separate power law correlations between the edge delamination fatigue growth rates and the term (Gmax/GR) are obtained. The measured exponents are in the range 4.1 to 6.

Polymer Matrix Composites: Guidelines for Characterization of Structural Materials

Author : Composite Materials Handbook – 17 (CMH-17)
Publisher : SAE International
ISBN 13 : 1468604953
Total Pages : 778 pages
Book Rating : 4.4/5 (686 download)

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Book Synopsis Polymer Matrix Composites: Guidelines for Characterization of Structural Materials by : Composite Materials Handbook – 17 (CMH-17)

Download or read book Polymer Matrix Composites: Guidelines for Characterization of Structural Materials written by Composite Materials Handbook – 17 (CMH-17) and published by SAE International. This book was released on 2022-09-06 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first volume of this six-volume compendium contains guidelines for determining the properties of polymer matrix composite material systems and their constituents, as well as the properties of generic structural elements, including test planning, test matrices, sampling, conditioning, test procedure selection, data reporting, data reduction, statistical analysis, and other related topics. Special attention is given to the statistical treatment and analysis of data. Volume 1 contains guidelines for general development of material characterization data as well as specific requirements for publication of material data in CMH-17. The primary purpose of this volume of the handbook is to document industry best-practices for engineering methodologies related to testing, data reduction, and reporting of property data for current and emerging composite materials. It is used by engineers worldwide in designing and fabricating products made from composite materials. The Composite Materials Handbook, referred to by industry groups as CMH-17, is a six-volume engineering reference tool that contains thousands of records of the latest test data for polymer matrix, metal matrix, ceramic matrix, and structural sandwich composites. CMH-17 provides information and guidance necessary to design, analyze, fabricate, certify and support end items using composite materials. It includes properties of composite materials that meet specific data requirements as well as guidelines for design, analysis, material selection, manufacturing, quality control, and repair.

Tension Fatigue of Glass/epoxy and Graphite/epoxy Tapered Laminates

Author :
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Tension Fatigue of Glass/epoxy and Graphite/epoxy Tapered Laminates by :

Download or read book Tension Fatigue of Glass/epoxy and Graphite/epoxy Tapered Laminates written by and published by . This book was released on 1990 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Hygrothermal Influence on Delamination Behavior of Graphite/epoxy Laminates

Author :
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Hygrothermal Influence on Delamination Behavior of Graphite/epoxy Laminates by :

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:

Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination

Author :
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination by :

Download or read book Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination written by and published by . This book was released on 1984 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Practical Analysis of Composite Laminates

Author : J. N. Reddy
Publisher : CRC Press
ISBN 13 : 1351423053
Total Pages : 336 pages
Book Rating : 4.3/5 (514 download)

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Book Synopsis Practical Analysis of Composite Laminates by : J. N. Reddy

Download or read book Practical Analysis of Composite Laminates written by J. N. Reddy and published by CRC Press. This book was released on 2018-02-06 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are increasingly used in aerospace, underwater, and automotive structures. They provide unique advantages over their metallic counterparts, but also create complex challenges to analysts and designers. Practical Analysis of Composite Laminates presents a summary of the equations governing composite laminates and provides practical methods for analyzing most common types of composite structural elements. Experimental results for several types of structures are included, and theoretical and experimental correlations are discussed. The last chapter is devoted to practical analysis using Designing Advanced Composites (DAC), a PC-based software on the subject. This comprehensive text can be used for a graduate course in mechanical engineering, and as a valuable reference for professionals in the field.

Analysis of Instability-related Growth of a Through-width Delamination

Author : J. D. Whitcomb
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Analysis of Instability-related Growth of a Through-width Delamination by : J. D. Whitcomb

Download or read book Analysis of Instability-related Growth of a Through-width Delamination written by J. D. Whitcomb and published by . This book was released on 1984 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Finite Element Analysis of Composite Laminates

Author : O.O. Ochoa
Publisher : Springer Science & Business Media
ISBN 13 : 9401579954
Total Pages : 222 pages
Book Rating : 4.4/5 (15 download)

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Book Synopsis Finite Element Analysis of Composite Laminates by : O.O. Ochoa

Download or read book Finite Element Analysis of Composite Laminates written by O.O. Ochoa and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are increasingly used in aerospace, underwater, and automotive structures. To take advantage of the full potential of composite materials, structural analysts and designers must have accurate mathematical models and design methods at their disposal. The objective of this monograph is to present the laminated plate theories and their finite element models to study the deformation, strength and failure of composite structures. Emphasis is placed on engineering aspects, such as the analytical descriptions, effective analysis tools, modeling of physical features, and evaluation of approaches used to formulate and predict the response of composite structures. The first chapter presents an overview of the text. Chapter 2 is devoted to the introduction of the definitions and terminology used in composite materials and structures. Anisotropic constitutive relations and Iaminate plate theories are also reviewed. Finite element models of laminated composite plates are presented in Chapter 3. Numerical evaluation of element coefficient matrices, post-computation of strains and stresses, and sample examples of laminated plates in bending and vibration are discussed. Chapter 4 introduces damage and failure criteria in composite laminates. Finally, Chapter 5 is dedicated to case studies involving various aspects and types of composite structures. Joints, cutouts, woven composites, environmental effects, postbuckling response and failure of composite laminates are discussed by considering specific examples.

Analysis of Delamination Growth from Matrix Cracks in Laminates Subjected to Bending Loads

Author : EG. Guynn
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Analysis of Delamination Growth from Matrix Cracks in Laminates Subjected to Bending Loads by : EG. Guynn

Download or read book Analysis of Delamination Growth from Matrix Cracks in Laminates Subjected to Bending Loads written by EG. Guynn and published by . This book was released on 1988 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delamination is the most commonly observed damage mode in laminated composite materials. A major source of delamination damage is from low-velocity impact. In thin composite laminates under point loads, matrix cracks develop first in the plies, and delaminations then grow from these cracks at the ply interfaces. The purpose of this study was to quantify the combined effects of bending and transverse shear loads on delamination initiation from matrix cracks in composite laminates. Graphite-epoxy laminates with 90-deg plies on the outside were tested and analyzed to provide a two-dimensional simulation of the back-surface damage observed during low-velocity impact. Three plate-bending problems were considered: four-point bending, three-point bending, and an end-clamped center-loaded plate. Under bending, a matrix crack will form on the tension side of the laminate, through the outer 90-deg plies and parallel to the fibers. Delaminations will then grow in the interface between the cracked 90-deg ply and the next adjacent ply. Laminate plate theory was used to derive simple equations relating the total strain energy release rate G, associated with the delamination growth from a 90-deg ply crack, to the applied bending load and laminate stiffness properties. Three different lay-ups, [904/0/±45]s, [904/03]s, and [903/0/±45]s, were tested and results compared. Test results verified that in all cases the delamination formed at the interface between the cracked 90-deg ply and the next adjacent ply. Calculated values for total Gc from the analysis showed good agreement for the three lay-ups and the three different test configurations. Using an assumed value for GIc from a previous study, the analysis was able to predict the delamination onset load for the cases considered. The result indicates that the opening mode component (Mode I) for delamination growth may be much larger than the component due to interlaminar shear (Mode II) from a matrix crack.

Delamination Failure in a Unidirectional Curved Composite Laminate

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722145934
Total Pages : 46 pages
Book Rating : 4.1/5 (459 download)

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Book Synopsis Delamination Failure in a Unidirectional Curved Composite Laminate by : National Aeronautics and Space Administration (NASA)

Download or read book Delamination Failure in a Unidirectional Curved Composite Laminate written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delamination failure in a unidirectional curved composite laminate was investigated. The curved laminate failed unstably by delaminations developing around the curved region of the laminate at different depths through the thickness until virtually all bending stiffness was lost. Delamination was assumed to initiate at the location of the highest radial stress in the curved region. A closed form curved beam elasticity solution and a 2-D finite element analysis (FEA) were conducted to determine this location. The variation in the strain energy release rate, G, with delamination growth was then determined using the FEA. A strength-based failure criteria adequately predicted the interlaminar tension failure which caused initial delamination onset. Using the G analysis the delamination was predicted to extend into the arm and leg of the laminate, predominantly in mode I. As the initial delamination grew arould the curved region, the maximum radial stress in the newly formed inner sublaminate increased to a level sufficient to cause a new delamination to initiate in the sublaminate with no increase in applied load. This failure progression was observed experimentally. Martin, Roderick H. Unspecified Center NAS1-18599; RTOP 505-63-01-05...

The Virtual Crack Closure Technique: History, Approach and Applications

Author : Ronald Krueger
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis The Virtual Crack Closure Technique: History, Approach and Applications by : Ronald Krueger

Download or read book The Virtual Crack Closure Technique: History, Approach and Applications written by Ronald Krueger and published by . This book was released on 2002 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.