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Effect Of Low Velocity Impact Damage On The Fatigue Behavior Of Graphite Epoxy Laminates
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Book Synopsis Effect of Low-Velocity Impact Damage on the Fatigue Behavior of Graphite/Epoxy Laminates by : RL. Ramkumar
Download or read book Effect of Low-Velocity Impact Damage on the Fatigue Behavior of Graphite/Epoxy Laminates written by RL. Ramkumar and published by . This book was released on 1983 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper discusses an experimental program that addressed the effect of low-velocity impact damage on the fatigue behavior of two laminates, fabricated from AS/3501-6 graphite/epoxy unidirectional tapes, with lay-ups representative of high-performance fighter aircraft wing skin lay-ups. Prior to testing, specimens from these laminates were subjected to one of two types of low-velocity impact damage. The first type was created using a blunt-tipped (1.6-cm tip diameter) impactor, and the impact energy was chosen to induce internal damage, approximately 5 cm in diameter, with no visible sign of damage on the outer surfaces. The second type of damage was created using a sharp (tetrahedral-tipped) impactor, with visible signs of damage on the impacted and opposite surfaces. Subsequent to introducing low-velocity impact damage, test specimens were subjected to static and constant amplitude fatigue loading. In the presence of compressive loads, lateral knife-edge supports were placed near the outer edge, for specimen stability, permitting unconstrained delamination growth elsewhere. Static tension and compression tests were conducted initially, and significant strength reductions due to the impact damages were measured. Fatigue load amplitudes were chosen to be fractions, S, of the static strengths. The behavior of impact-damaged specimens was investigated under tension-tension (R ? 0), tension-compression (R = -1), and compression-compression (R -> -?) fatigue loads. During fatigue, the growth in the impact damage was monitored by means of ultrasonic pulse-echo records. Fatigue life data for the various laminate-damage-loading combinations were obtained in the form of S-N curves. Interesting damage growth patterns were observed, and the criticality of each type of impact damage on the fatigue behavior of the tested laminates was assessed.
Book Synopsis Long-term Behavior of Composites by : O'Brien
Download or read book Long-term Behavior of Composites written by O'Brien and published by ASTM International. This book was released on 1983 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Low Velocity Impact Damage on Thick-section Graphite/epoxy Laminates by : Andrew Paul Marshall
Download or read book Low Velocity Impact Damage on Thick-section Graphite/epoxy Laminates written by Andrew Paul Marshall and published by . This book was released on 1992 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723178887 Total Pages :174 pages Book Rating :4.1/5 (788 download)
Book Synopsis Indentation-Flexure and Low-Velocity Impact Damage in Graphite/Epoxy Laminates by : National Aeronautics and Space Administration (NASA)
Download or read book Indentation-Flexure and Low-Velocity Impact Damage in Graphite/Epoxy Laminates written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Static indentation and low velocity impact tests were performed on quasi-isotropic and cross ply graphite/epoxy composite laminates. The load deflection relations in static tests and impact force history in the impact tests were recorded. The damage was assessed by using ultrasonic C-scanning and photomicrographic techniques. The static behavior of the laminates and damage progression during loading, unloading, and reloading were explained by a simple plate delamination model. A good correlation existed between the static and impact responses. It was found that results from a few static indentation-flexture tests can be used to predict the response and damage in composite laminates due to a class of low velocity impact events. Kwon, Young S. and Sankar, Bhavani V. Unspecified Center GRAPHITE-EPOXY COMPOSITES; IMPACT DAMAGE; IMPACT TESTS; INDENTATION; LOW SPEED; MATHEMATICAL MODELS; STATIC TESTS; DELAMINATING; LAMINATES; MECHANICAL PROPERTIES; NONDESTRUCTIVE TESTS; PHOTOMICROGRAPHS; STRAIN ENERGY RELEASE RATE; ULTRASONIC FLAW DETECTION...
Book Synopsis Low-velocity Impact Effects on Graphite/epoxy Laminates by : Jon Shively
Download or read book Low-velocity Impact Effects on Graphite/epoxy Laminates written by Jon Shively and published by . This book was released on 1985 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Load Sequence Effects on Graphite/Epoxy [±35]2s Laminates by : DL. Jones
Download or read book Load Sequence Effects on Graphite/Epoxy [±35]2s Laminates written by DL. Jones and published by . This book was released on 1983 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of load sequence on the fatigue behavior of composite materials is contributed by (1) the difference in residual strength when fatigue fracture occurs, referred to as the boundary effect, and (2) the material memory effect with respect to previously experienced loads. A theoretical fatigue model previously developed by the authors is generalized herein to include the memory effect. The present model permits isolation of the memory effect from the boundary effect, thus the extent of the memory effect can be identified using residual strength test results under dual-level fatigue loadings. An experimental test program using graphite/epoxy [±35]2s laminates under high-low and low-high load sequences has been conducted to generate statistical residual strength data. It is shown that the material memory effect does exist for Gr/E [±35]2s laminates, as predicted by the model. The correlation between the test results and the theoretical predictions of the median residual strength and the expected percentage of fatigue failures under dual loading is very good. However, the statistical dispersion of the residual strength test results is much smaller than that of the static ultimate strength and that predicted by the model.
Book Synopsis Carmina congratulatoria destinata honoribus Lucae Richter ... by :
Download or read book Carmina congratulatoria destinata honoribus Lucae Richter ... written by and published by . This book was released on 1600 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Indentation-Flexure and Low-Velocity Impact Damage in Graphite Epoxy Laminates by : YS. Kwon
Download or read book Indentation-Flexure and Low-Velocity Impact Damage in Graphite Epoxy Laminates written by YS. Kwon and published by . This book was released on 1993 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Static indentation-flexure and low-velocity impact tests were performed on quasi-isotropic and cross-ply graphite/epoxy composite laminates. The load-deflection relations in static tests and impact force history in impact tests were recorded. The damage was assessed by using ultrasonic C-scanning and photo-micrographic techniques. Some features of the static behavior were explained by simple analytical models. A good correlation existed between the load-deflection curves for static and impact loading. It was found that results from a few static indentation-flexure tests can be used to predict the impact force history and delamination radius in composite laminates due to low-velocity impact.
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 Indentation-flexure and Low-velocity Impact Damage in Graphite/epoxy Laminates by :
Download or read book Indentation-flexure and Low-velocity Impact Damage in Graphite/epoxy Laminates written by and published by . This book was released on 1992 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Low Velocity Impact Damage in a Twenty Four Ply Graphite-epoxy Laminate by : Jean-Maurice Férauge
Download or read book Characterization of Low Velocity Impact Damage in a Twenty Four Ply Graphite-epoxy Laminate written by Jean-Maurice Férauge and published by . This book was released on 1989 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Damage Detection in Composite Materials by : John E. Masters
Download or read book Damage Detection in Composite Materials written by John E. Masters and published by ASTM International. This book was released on 1992 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of 16 papers from an international symposium in San Antonio, November 1990, focusing on the necessary coordination between materials scientists, stress analysts, and non-destructive evaluation specialists, for successfully designing, building, certifying, and maintaining composite struc
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 1991 with total page 1102 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 1980 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures by : D. E. Pettit
Download or read book Advanced Residual Strength Degradation Rate Modeling for Advanced Composite Structures written by D. E. Pettit and published by . This book was released on 1979 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of the first task of a three task program directed at the study of relationship between damage propagation and residual static strength of composite laminates. In Task 1: Preliminary screening, two laminates a 24-Ply 67% 0 deg. fiber and a 32-Ply quasi-isotropic laminate of T300/5208 graphite epoxy material were selected for study. Two damage types were studied, a low velocity impact condition (i.e., simulated tool drop) and a badly drilled hole. An initial study was conducted for each damage type to determine the detailed damage introduction parameters resulting in the selection of one set of impact and one set of poor drilling conditions. Baseline static tension and static compression tests were conducted on each of the four damage/laminate conditions. Stress vs life (S-N) fatigue data were then generated at range ratio R=-1 for each of the four conditions. The damage growth characteristics were monitored on each fatigue specimen using a modified Holscan ultrasonic unit. A subset of the damaged hole specimens was also evaluated in static compression and fatigue (R = -1) using TBE enhanced X-ray methods to monitor damage growth and to assess any detrimental effect of TBE on subsequent behavior of the damage. The results indicate significant reduction in initial static tension and compression strengths for the damaged hole condition in both laminates.
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