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Analysis Of Matrix Cracking And Local Delamination In 0 Theta Thetasub S Graphite Epoxy Laminates Under Tension Load
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Book Synopsis Analysis of Matrix Cracking and Local Delamination in (0/theta/-theta)sub S Graphite Epoxy Laminates Under Tension Load by :
Download or read book Analysis of Matrix Cracking and Local Delamination in (0/theta/-theta)sub S Graphite Epoxy Laminates Under Tension Load written by and published by . This book was released on 1991 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722085728 Total Pages :30 pages Book Rating :4.0/5 (857 download)
Book Synopsis Analysis of Matrix Cracking and Local Delamination in (0/Theta/-Theta)Sub S Graphite Epoxy Laminates Under Tension Load by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Matrix Cracking and Local Delamination in (0/Theta/-Theta)Sub S Graphite Epoxy Laminates Under Tension Load written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several 3D finite element analyses of (0/theta/-theta)sub s graphite epoxy laminates, where theta=15, 20, 25, 30, and 45 deg, subjected to axial tension load were performed. The interlaminar stresses in the theta/-theta interface were calculated with and without a matrix crack in the central -theta plies. The interlaminar normal stress changes from a small compressive stress when no matrix crack is present to a high tensile stress at the intersection of the matrix crack and free edge. The analysis of local delamination from the -theta matrix crack indicates a high strain energy release rate and a localized mode I component near the free edge, within one ply distance from the matrix crack. In order to examine the stress state causing the matrix cracking the maximum principal normal stress in a plane perpendicular to the fiber direction in the -theta ply was calculated in an uncracked laminate. The corresponding shear stress parallel to the fiber was also calculated. The principal normal stress at the laminate edge increases through the ply thickness and reached a very high tensile value at the theta/-theta interface indicating that the crack in the -theta ply may initiate at the theta/-theta interface. Crack profiles on the laminate edge in the -theta ply were constructed from the principal stress directions. The cracks were found to be more curved for layups with smaller theta angles, which is consistent with experimental observations in the literature. Salpekar, S. A. and Obrien, T. K. Langley Research Center RTOP 505-63-01-05...
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 1994 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1994-07 with total page 1438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1992 with total page 1246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722234164 Total Pages :68 pages Book Rating :4.2/5 (341 download)
Book Synopsis Analysis of Local Delaminations Caused by Angle Ply Matrix Cracks by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Local Delaminations Caused by Angle Ply Matrix Cracks written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two different families of graphite/epoxy laminates with similar layups but different stacking sequences, (0, theta, -theta) sub s and (-theta/theta/0) sub s were analyzed using three-dimensional finite element analysis for theta = 15 and 30 degrees. Delaminations were modeled in the -theta/theta interface, bounded by a matrix crack and the stress free edge. The total strain energy release rate, G, along the delamination front was computed using three different techniques: the virtual crack closure technique (VCCT), the equivalent domain Integral (EDI) technique, and a global energy balance technique. The opening fracture mode component of the strain energy release rate, Gl, along the delamination front was also computed for various delamination lengths using VCCT. The effect of residual thermal and moisture stresses on G was evaluated. Salpekar, Satish A. and Obrien, T. Kevin and Shivakumar, K. N. Langley Research Center.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722617707 Total Pages :58 pages Book Rating :4.6/5 (177 download)
Book Synopsis Local Delamination in Laminates with Angle Ply Matrix Cracks. Part 2 by : National Aeronautics and Space Administration (NASA)
Download or read book Local Delamination in Laminates with Angle Ply Matrix Cracks. Part 2 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant amplitude tension-tension fatigue tests were conducted on AS4/3501-6 graphite/epoxy (02/ theta sub 2/ -(theta sub 2))sub s laminates, where theta was 15, 20, 25, or 30 degrees. Fatigue tests were conducted at a frequency of 5 Hz and an R-ratio of 0.1. Dye penetrant enhanced x-radiography was used to document the onset of matrix cracking in the central -(theta) degree plies, and the subsequent onset of local delaminations in the theta/ -(theta) interface at the intersection of the matrix cracks and the free edge, as a function of the number of fatigue cycles. Two strain energy release rate solutions for local delamination from matrix cracks were derived: one for a local delamination growing from an angle ply matrix crack with a uniform delamination growing from an angle ply matrix crack with a triangular shaped delamination area that extended only partially into the laminate width from the free edge. Plots of G(max) vs. N were generated to assess the accuracy of these G solutions. The influence of residual thermal and moisture stresses on G were also quantified. However, a detailed analysis of the G components and a mixed-mode fatigue failure criterion for this material may be needed to predict the fatigue behavior of these laminates. Obrien, T. Kevin Langley Research Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722082970 Total Pages :34 pages Book Rating :4.0/5 (829 download)
Book Synopsis Analysis of Delamination in Cross Ply Laminates Initiating from Impact Induced Matrix Cracking by : National Aeronautics and Space Administration (NASA)
Download or read book Analysis of Delamination in Cross Ply Laminates Initiating from Impact Induced Matrix Cracking written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several two dimensional finite element analyses of (0 sub 2/90 sub 8/0 sub 2) glass/epoxy and graphite-epoxy composite laminates were performed to study some of the characteristics of damage development due to an impact load. A cross section through the thickness of the laminate with fixed ends, and carrying a transverse load in the center was analyzed. Inclined matrix cracks such as those produced by low velocity impact were modeled in the 90 deg ply group. The introduction of the matrix cracks caused large interlaminar tension and shear stresses in the vicinity of both crack tips in the 0/90 and 90/0 interfaces. The large interlaminar stresses at the ends of the matrix cracks indicate that matrix cracking may give rise to delamination. The ratio of mode I to total strain energy release rate at the beginning of delamination calculated at the two matrix crack tips was 60 and 28 pct., respectively, in the glass/epoxy laminate. The corresponding ratio was 97 and 77 pct. in the graphite-epoxy laminate. Thus, a significant mode I component of strain energy release rate may be present at the delamination initiation due to an impact load. Salpekar, S. A. Unspecified Center NAS1-19399; NAS1-18599; RTOP 505-63-50-04...
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 Combined Effect of Matrix Cracking and Stress-free Edge on Delamination by : Satish Annaji Salpekar
Download or read book Combined Effect of Matrix Cracking and Stress-free Edge on Delamination written by Satish Annaji Salpekar and published by DIANE Publishing. This book was released on 1990 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comprehensive Guide to Lamb Waves by : Nitesh Prakash Yelve
Download or read book A Comprehensive Guide to Lamb Waves written by Nitesh Prakash Yelve and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book presents the fundamental concept of Lamb wave propagation and its application for damage detection in metals and composites. The editor has taken utmost care to include a range of applications of Lamb waves, in the linear and nonlinear domains, in this book. Various damage location algorithms making use of linear characteristics of Lamb waves and a few case studies making use of nonlinear characteristics Lamb waves for damage detection are presented in a simple-to-understand way. Readers will find detailed descriptions for experiments, simulation, and signal processing. The last chapter that focuses on the evaluation of fatigue-induced material nonlinearity would help readers to understand the complex applications of Lamb waves. The forthcoming books in this series would include state-of-the-art applications of guided waves for damage detection, material characterization, and estimation of the remnant useful life of engineering structures"--
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722304362 Total Pages :68 pages Book Rating :4.3/5 (43 download)
Book Synopsis Combined Effect of Matrix Cracking and Stress-Free Edge on Delamination by : National Aeronautics and Space Administration (NASA)
Download or read book Combined Effect of Matrix Cracking and Stress-Free Edge on Delamination written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of the stress-free edge on the growth of local delaminations initiating from a matrix crack in (0 sub 2/90 sub 4) sub s and (+ or - 45.90 sub 4) sub s glass epoxy laminates is investigated using 3-D finite element analysis. The presence of high interlaminar normal stresses at the intersection (corner) of the matrix crack with the stress-free edge, suggests that a mode I delamination may initiate at the corners. The strain energy release rates (G) were calculated by modeling a uniform through-width delamination and two inclined delaminations at 10.6 deg and 45 deg to the matrix crack. All components of G have high values near the free edges. The mode I component of G is high at small delamination length and becomes zero for a delamination length of one-ply thickness. The total G values near the free edge agreed well with previously derived closed form solution. The quasi-3D solutions agreed well with the 3-D interior solutions. Salpekar, S. A. and Obrien, T. K. Langley Research Center...
Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Office Publisher : ISBN 13 : Total Pages :156 pages Book Rating :4.0/5 ( download)
Book Synopsis The NASA Scope and Subject Category Guide by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
Download or read book The NASA Scope and Subject Category Guide written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Office and published by . This book was released on 2000 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bistatic SAR System and Signal Processing Technology by : Robert Wang
Download or read book Bistatic SAR System and Signal Processing Technology written by Robert Wang and published by Springer. This book was released on 2017-12-26 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports the latest results in the study of Bistatic/Multistatic SAR system and signal processing techniques. Novel research ideas and experimental verification have been collected on all kinds of configurations of Bistatic/Multistatic SAR system, including the preliminary construction of system model, imaging algorithm design, mission design and the corresponding application representations etc. Handy well-prepared tables are provided for readers’ quick-reference, and the practical design of an interferometric SAR system is illustrated step by step. The book will be of interest to university researchers, R&D engineers and graduate students in Remote Sensing who wish to learn the core principles, methods, algorithms, and applications of Bistatic/Multistatic SAR system.
Book Synopsis Stress Analysis in Cross-ply Laminates Damaged by Transverse Matrix Cracks by : Jung Ki Lee
Download or read book Stress Analysis in Cross-ply Laminates Damaged by Transverse Matrix Cracks written by Jung Ki Lee and published by . This book was released on 1989 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
