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Verification Of A Methodology For Predicting Delamination Growth In Laminated Graphite Epoxy Composites
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Book Synopsis Verification of a Methodology for Predicting Delamination Growth in Laminated Graphite-epoxy Composites by : Simon James Gharibian
Download or read book Verification of a Methodology for Predicting Delamination Growth in Laminated Graphite-epoxy Composites written by Simon James Gharibian and published by . This book was released on 1999 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Predictive Methodology for Delamination Growth in Laminated Composites by : Barry D. Davidson
Download or read book A Predictive Methodology for Delamination Growth in Laminated Composites written by Barry D. Davidson and published by . This book was released on 1998 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Predictive Methodology for Delamination Growth in Laminated Composites. Part II. Analysis, Applications, and Accuracy Assessment by :
Download or read book A Predictive Methodology for Delamination Growth in Laminated Composites. Part II. Analysis, Applications, and Accuracy Assessment written by and published by . This book was released on 2001 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: A nonclassical, energy release rate-based approach to predict delamination growth is described that overcomes the limitations of current, state-of-the art methodologies. First, two- and three-dimensional crack-tip elements are-introduced. When a classical, singular field-based mode decomposition procedure is used, the crack-tip elements are shown to predict the same values of energy release rate and mode mixity as two- and three-dimensional continuum finite element analyses for a wide variety of geometries, materials, lay-ups and loadings, including stiffened-skin construction typical to that used in aircraft construction. However, the crack tip element (CTE) analyses are considerably simpler and require orders of magnitude less development and execution time. Next, it is demonstrated that the CTE analyses may also be used to decompose the total energy release rate into nonclassical mode I, II, and III components. This nonsingular field (NSF) decomposition may be used, along with toughness versus mode mix data obtained from unidirectional laminates with midplane delaminations, to predict delamination growth with considerably better accuracy than the classical, state-of-the-art approach. This is due to the fact that the near-tip damage zone is sufficiently large in polymeric matrix composites to invalidate the classical assumptions, whereas the NSF mode decomposition is constructed in a manner that is insensitive to the details of this local damage state. This is demonstrated by applying both the classical and CTE/NSF approaches to make delamination growth predictions in four different graphite-reinforced composites, with matrices that include an epoxy, a toughened epoxy, a thermoplastic interlayer toughened epoxy, and a thermoplastic. For this portion of the study, only flat plate geometries were considered.
Book Synopsis A Predictive Methodology for Delamination Growth in Laminated Composites Growth in Laminated Composites. Part 2. Analysis, Applications, and Accuracy Assessment by :
Download or read book A Predictive Methodology for Delamination Growth in Laminated Composites Growth in Laminated Composites. Part 2. Analysis, Applications, and Accuracy Assessment written by and published by . This book was released on 2001 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: A nonclassical, energy release rate-based approach to predict delamination growth is described that overcomes the limitations of current, state-of-the art methodologies. First, two- and three-dimensional crack-tip elements are-introduced. When a classical, singular field-based mode decomposition procedure is used, the crack-tip elements are shown to predict the same values of energy release rate and mode mixity as two- and three-dimensional continuum finite element analyses for a wide variety of geometries, materials, lay-ups and loadings, including stiffened-skin construction typical to that used in aircraft construction. However, the crack tip element (CTE) analyses are considerably simpler and require orders of magnitude less development and execution time. Next, it is demonstrated that the CTE analyses may also be used to decompose the total energy release rate into nonclassical mode I, II, and III components. This nonsingular field (NSF) decomposition may be used, along with toughness versus mode mix data obtained from unidirectional laminates with midplane delaminations, to predict delamination growth with considerably better accuracy than the classical, state-of-the-art approach. This is due to the fact that the near-tip damage zone is sufficiently large in polymeric matrix composites to invalidate the classical assumptions, whereas the NSF mode decomposition is constructed in a manner that is insensitive to the details of this local damage state. This is demonstrated by applying both the classical and CTE/NSF approaches to make delamination growth predictions in four different graphite-reinforced composites, with matrices that include an epoxy, a toughened epoxy, a thermoplastic interlayer toughened epoxy, and a thermoplastic. For this portion of the study, only flat plate geometries were considered.
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:
Book Synopsis Application of a Stochastic Model for Fatigue-Induced Delamination Growth in Graphite/Epoxy Laminates by : RB. Bucineill
Download or read book Application of a Stochastic Model for Fatigue-Induced Delamination Growth in Graphite/Epoxy Laminates written by RB. Bucineill and published by . This book was released on 1998 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A stochastic model is used to predict the growth of delamination in graphite/epoxy laminates subjected to cyclic loading. The advantage of this model is that both the mean and variance associated with the growth of delamination is predicted. Understanding and predicting the variability associated with the delamination growth process is essential to the estimation of the reliability of composite structures. The empirical nature of the model has been minimized through the introduction of fracture mechanics parameters into the stochastic model. This has been accomplished by assuming that the mean of the stochastic model is represented by a fracture mechanics power law based on strain energy release rate. The applicability of the model is demonstrated through an experimental program that utilizes three laminate geometries. The results of the experimental evaluation illustrate the ability of the model to predict both the mean and variance of the delamination growth process in composite laminates subjected to cyclic loading.
Book Synopsis Delamination Growth in Graphite/epoxy Composite Laminates Under Tensile Loading by : Narendra Venugopal Bhat
Download or read book Delamination Growth in Graphite/epoxy Composite Laminates Under Tensile Loading written by Narendra Venugopal Bhat and published by . This book was released on 1993 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: The growth of triangular-shaped delaminations bordered by matrix cracks, defined herein as "compound delaminations", occurring at the free edges of [±15n]s and [±15n0n]s laminates in static tensile loading was investigated. This triangular compound delamination is the first macroscopic damage observed. Failure of the laminates occurs by unstable growth of these delaminations. The experimental study involved the manufacture of specimens with Teflon implants to create an initial delamination configuration with the delamination oriented at 90° to the matrix crack. The delamination front was monitored using strain gages and X-ray radiographs. Growth was observed to occur at the delamination front near the free edge region with no growth at the matrix crack front resulting in the same configuration as observed in originally unflawed specimens. A three-dimensional displacement-based finite element model of the delaminated region was created and the equivalent domain integral was used to determine the energy release rate at the delamination and matrix crack fronts. The energy release rate was predicted to be highest at the intersection of the delamination and the free edge and was lowest at the intersection of the delamination and the matrix crack. The peak energy release rate predicted at the matrix crack front was smaller than that at the delamination front. Growth was simulated in the model by tilting the delamination front about the matrix crack front. The maximum energy release rate along the delamination dropped and became more uniform as the delamination was tilted. These results indicate that the stable delamination configuration observed is formed by the growth of the delamination front at the free edge region in regions of high energy release rate in preference to the growth of the matrix crack resulting in a curved delamination contour. The overall decrease in energy release rate associated with this delamination growth indicates that the resulting curved delamination is a more stable configuration. The failure process in these specimens involves the formation of these stable delaminations, followed by secondary cracking in the plies adjacent to the delamination, and lastly final failure via unstable growth of the entire triangular region to the ends of the specimen.
Book Synopsis Delamination in Composites--is Toughness the Key? by : Paul A. Lagace
Download or read book Delamination in Composites--is Toughness the Key? written by Paul A. Lagace and published by . This book was released on 1986 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Predictive Methodology for Delamination Growth in Laminated Composites Part I: Theoretical Development and Preliminary Experimental Results by :
Download or read book A Predictive Methodology for Delamination Growth in Laminated Composites Part I: Theoretical Development and Preliminary Experimental Results written by and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A methodology is presented for the prediction of delamination growth in laminated structures. The methodology is aimed at overcoming computational difficulties in the determination of energy release rate and mode mix. It also addresses the issue that many laminated composites exhibit large-scale crack tip damage zones and, as such, a singular field-based mode mix decomposition may not accurately account for the dependence of toughness on the loading. In the methodology, the toughness versus mode mix relation, and the definition of mode mix itself, is first determined experimentally. The definition of mode mix is found from the results of a series of delamination toughness tests and is obtained within the construct of a crack tip element analysis. Next, the structure of interest is analyzed using the crack tip element analysis and the experimentally determined definition of mode mix, and delamination growth assessments are performed. This approach also obviates the need for locally detailed two- and three-dimensional finite element analyses.
Book Synopsis Delamination Behaviour of Composites by : Srinivasan Sridharan
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
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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 Compressive Behaviour of Composites by : C. Soutis
Download or read book Compressive Behaviour of Composites written by C. Soutis and published by iSmithers Rapra Publishing. This book was released on 1997 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews the most important studies undertaken of the compressive failure mechanisms encountered in modern composite materials. It considers first the behaviour of unidirectional laminates, followed by unnotched and notched multidirectional structures. It then considers existing theoretical models. An additional indexed section containing several hundred abstracts from the Rapra Polymer Library database provides useful references for further reading.
Book Synopsis Delamination and Debonding of Materials by : W. Steven Johnson
Download or read book Delamination and Debonding of Materials written by W. Steven Johnson and published by ASTM International. This book was released on 1985 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Publications by : United States. National Bureau of Standards
Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1980 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Composites Technology Review written by and published by . This book was released on 1981 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
