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Study Of Artificially Induced Failure Modes In Graphite Epoxy Composite Laminates Using High Sesitivity Moire Interferometry
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Book Synopsis Study of Artificially Induced Failure Modes in Graphite-epoxy Composite Laminates Using High Sesitivity Moire Interferometry by : Samuel Ikechukwu Ibekwe
Download or read book Study of Artificially Induced Failure Modes in Graphite-epoxy Composite Laminates Using High Sesitivity Moire Interferometry written by Samuel Ikechukwu Ibekwe and published by . This book was released on 1991 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Masters Theses in the Pure and Applied Sciences by : Wade H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 36 (thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 36 reports theses submitted in 1991, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Book Synopsis Masters Theses in the Pure and Applied Sciences by : W. H. Shafer
Download or read book Masters Theses in the Pure and Applied Sciences written by W. H. Shafer and published by Springer Science & Business Media. This book was released on 1993 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 36 reports (for thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 US universities. The organization of the volume, as in past years, consists of thesis titles arranged by discipline, and by university within each discipline. The titles are contributed by any and all a
Book Synopsis Experimental Study of the Effect of Stacking Sequence on Graphite-epoxy Composite Specimines with Artificially Induced Notches Subjected to Tension-tension Cyclic Loading Using Moire Interferometry by : Umesh M. Cooduvalli
Download or read book Experimental Study of the Effect of Stacking Sequence on Graphite-epoxy Composite Specimines with Artificially Induced Notches Subjected to Tension-tension Cyclic Loading Using Moire Interferometry written by Umesh M. Cooduvalli and published by . This book was released on 1990 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Resin Toughness and Modulus on Compressive Failure Modes of Quasi-isotropic Graphite/epoxy Laminates by :
Download or read book The Effect of Resin Toughness and Modulus on Compressive Failure Modes of Quasi-isotropic Graphite/epoxy Laminates written by and published by . This book was released on 1986 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analytical and Experimental Study of Mechanisms Critical to the Failure of Notched Graphite/epoxy Laminates by : Richard André Kroes
Download or read book An Analytical and Experimental Study of Mechanisms Critical to the Failure of Notched Graphite/epoxy Laminates written by Richard André Kroes and published by . This book was released on 1994 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental results and a numerical study were used to investigate the mechanisms critical to the failure of notched graphite/epoxy laminates. Experimental results from the Boeing/NASA ATCAS program were reviewed and reduced to give insight into the growth of damage from the tips of notches in tensile specimens. A finite element model was constructed to model the specimens, and a damaged based modeling approach used to investigate the effects of this damage. Properties of the elements in a region at the notch tips were altered to simulate damage. Matrix failure and fiber failure were modeled by reducing the material properties in these elements. Delaminations were modeled using a 2-D stacked membrane approach. The damage types were impregnated into the finite element model individually and in various combinations, and the changes in the stress and strain distributions in the model examined. Most calculations were linear. A geometrically non-linear model was used to examine buckling observed above and below the notch in large specimens. The experimental results confirmed the importance of the role of progressive damage growing from the notch tip in the failure of the laminate. Such damage can actually increase the strength of the laminate by relieving the stress concentration at the notch tip. The numerical results showed that modeled matrix failure and delaminations had very small effects individually, but significant effects when combined. Fiber failure had a large effect. Only models incorporating severe damage, including delaminations, matrix cracking, and substantial fiber failure, could correlate to the large changes in strain distribution observed to accompany damage in the test specimens. The non-linear analyses replicated the observed buckling above and below the notch. It was found to have a major effect on the stresses near the notch tip. This study shows that it is possible to model the effects of damage on the stress field in a notched composite laminate; that such models are sensitive to modeling details such as interactions of damage types; that the damage observed during tests is severe; and that buckling near the notch tip can have profound effects.
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Damage-strength Relationships in Composite Laminates. Volume 1 by : Kenneth L. Reifsnider
Download or read book Fatigue Damage-strength Relationships in Composite Laminates. Volume 1 written by Kenneth L. Reifsnider and published by . This book was released on 1983 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is Vol. I of a 2-part final report on the activities which were conducted under Contract No. F33615-81-3225. The general objective of this program was to investigate the precise nature of the damage events caused by cyclic (fatigue) loading of composite laminates that are directly related to fracture of those laminates, to develop a conceptual understanding of how those damage events reduce the residual strength of the laminates, and to determine how the collective damage condition following long-term cyclic loading precipitates the final fracture event. The program was conducted in four phases: (1) the development of fatigue damage during long-term cyclic loading was investigated in such a way that the damage events which occur quite late in the fatigue life of the material, just prior to fracture, were identified and characterized; (2) the special contribution and nature of fiber fracture was investigated; (3) the nature of the collective damage condition which precipitates the fracture event under long-term fatigue loading was investigated; (4) a philosophy of fracture in composite laminates following severe damage development due to cyclic loading was developed. A wide variety of destructive and nondestructive experimental evaluation schemes were used in the program, and several analytical efforts were conducted to support the experimental activities.
Book Synopsis Advanced Fatigue Damage Development in Graphite Epoxy Laminates by : Russell Douglas Jamison
Download or read book Advanced Fatigue Damage Development in Graphite Epoxy Laminates written by Russell Douglas Jamison and published by . This book was released on 1982 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of an experimental investigation of damage development in T300/5208 graphite epoxy laminates subjected to tension-tension cyclic loading are reported. The concept of laminate stiffness reduction as a damage analogue is shown to be a valuable means of test control and damage interpretation. The relationship between stiffness and number of cycles is shown to be unique for each laminate type studied, each possessing three distinct stages, but markedly different among the laminate types. By using two complementary nondestructive evaluation (NDE) techniques, edge replication and penetrant-enhanced stereo X- ray radiography along with a method for deploying fatigue-damaged specimens, the stages of stiffness reduction were found to correspond variously to the predominance of matrix cracking or delamination or interactions of these matrix damage modes. A number of subordinate matrix damage modes including interior delamination, microcracking, and longitudinal splitting are identified with the matrix cracks which produce them.
Book Synopsis Evaluation of Failure Criterion for Graphite/epoxy Fabric Laminates by : Roderick Clarence Tennyson
Download or read book Evaluation of Failure Criterion for Graphite/epoxy Fabric Laminates written by Roderick Clarence Tennyson and published by . This book was released on 1985 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Damage-Strength Relationships in Composite Laminates. Volume 2 by : Kenneth L. Reifsnider
Download or read book Fatigue Damage-Strength Relationships in Composite Laminates. Volume 2 written by Kenneth L. Reifsnider and published by . This book was released on 1984 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents information and experience generated during the subject investigation which provided support for the major thrust of the effort, but was not the eventual focus of the program. The activities are discussed in the context of the various experimental techniques used (and developed) to investigate the context of the damage development. Whil much of the information discussed is not complete, it is thought that a description of the experimental methods and experiences will be valuable to the technical community. Included are descriptions of virtually every experimental technique used in this program and a variety of findings not discussed elsewhere.
Book Synopsis Effect of Moisture on the Fatigue Behavior of Graphite/epoxy Composite Laminates by :
Download or read book Effect of Moisture on the Fatigue Behavior of Graphite/epoxy Composite Laminates written by and published by . This book was released on 1979 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Failure of Morphology of (0 Deg)8 Graphite/epoxy as Influenced by Environments and Processing by :
Download or read book Failure of Morphology of (0 Deg)8 Graphite/epoxy as Influenced by Environments and Processing written by and published by . This book was released on 1981 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Strength and Failure Analysis of Composite Laminates with Holes at Room and Elevated Temperatures by : B. U. Malik
Download or read book Strength and Failure Analysis of Composite Laminates with Holes at Room and Elevated Temperatures written by B. U. Malik and published by . This book was released on 1984 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: The composite material community has been interested in developing a matrix fiber combination which could improve the ability of a laminate in resisting interlaminate fracture impact loading to a greater degree than in the past and ultimately, improve upon the toughness of the composite material. Recently, a matrix has been manufactured that appears to assist in obtaining these goals. This material is a thermoplastic resin referred to as polyetheretherkeytone (Peek). A review of literature produced very little information related to Gr/Peek. Thus an experimental study reported here-in was conducted to investigate the high temperature strength (tension and compression) of Gr/Peek and Gr/Epoxy laminates with holes. The results were then used to determine the parameters necessary to predict trends incorporating the point stress, average stress failure criteria and the three parameter curve fir criterion. The comparison of predicted and experimental failure stress are shown graphically. The failure modes of Gr/Peek and Gr/Ep are analyzed with the help of electron scanning micrographs. It is seen that an interface degradation exists for Gr/Peek (Polyetheretherkeytone) at higher temperatures. An effect of shear crippling similar to that of Gr/Ep is observed in compression failure of Gr/Peek. Originator-supplied keywords include: Composite Materials, Notch Sensitivity, Fracture ((Mechanics), GR(Graphite), Strength (Mechanics), Theses.
Book Synopsis Hygrothermal Effects on Mechanical Behavior of Graphite/epoxy Laminates Beyond Initial Failure by :
Download or read book Hygrothermal Effects on Mechanical Behavior of Graphite/epoxy Laminates Beyond Initial Failure written by and published by . This book was released on 1984 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720362401 Total Pages :46 pages Book Rating :4.3/5 (624 download)
Book Synopsis A New Merit Function for Evaluating the Flaw Tolerance of Composite Laminates. Part 2; Arbitrary Size Holes and Center Cracks by : National Aeronautics and Space Administration (NASA)
Download or read book A New Merit Function for Evaluating the Flaw Tolerance of Composite Laminates. Part 2; Arbitrary Size Holes and Center Cracks written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a previous paper, a new merit function for determining the strength performance of flawed composite laminates was presented. This previous analysis was restricted to circular hole flaws that were large enough that failure could be predicted using the laminate stress concentration factor. In this paper, the merit function is expanded to include the flaw cases of an arbitrary size circular hole or center crack. Failure prediction for these cases is determined using the point stress criterion. An example application of the merit function is included for a wide range of graphite/epoxy laminates.Martin, Mikulas M., Jr. and Sumpter, RodLangley Research CenterSTRESS CONCENTRATION; LAMINATES; FAILURE ANALYSIS; HOLES (MECHANICS); NONDESTRUCTIVE TESTS; PREDICTIONS; DEFECTS; CRITERIA; CRACKS; GRAPHITE-EPOXY COMPOSITES
Book Synopsis Failure Characterization of a Graphite/epoxy Composite Laminate Using Distortion Energy by : Keith D. Mazachek
Download or read book Failure Characterization of a Graphite/epoxy Composite Laminate Using Distortion Energy written by Keith D. Mazachek and published by . This book was released on 1992 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt:
