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Analysis Of Local Delaminations Caused By Angle Ply Matrix Cracks
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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.
Book Synopsis Analysis of Local Delaminations Caused by Angle Ply Matrix Cracks by : Satish A. Salpekar
Download or read book Analysis of Local Delaminations Caused by Angle Ply Matrix Cracks written by Satish A. Salpekar and published by . This book was released on 1993 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fracture Analysis of Local Delaminations Induced by Angle Ply Matrix Cracking in Continuous Fibre-Reinforced Composite Laminates by : Costas Soutis
Download or read book Fracture Analysis of Local Delaminations Induced by Angle Ply Matrix Cracking in Continuous Fibre-Reinforced Composite Laminates written by Costas Soutis and published by . This book was released on 2000 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Local Delamination in Laminates with Angle Ply Matrix Cracks, Part I by : SJ. Hooper
Download or read book Local Delamination in Laminates with Angle Ply Matrix Cracks, Part I written by SJ. Hooper and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quasi-static tension tests were conducted on AS4/3501-6 graphite epoxy (02/?2/-?2)s laminates, where ? was 15, 20, 25, or 30°. Dye penetrant-enhanced X-radiography was used to document the onset of matrix cracking in the central - ?° plies and the onset of local delaminations in the ?/-? interface at the intersection of the matrix cracks and the free edge. Edge micrographs taken after the onset of damage were used to verify the location of the matrix cracks and local delaminations through the laminate thickness.
Book Synopsis Local Delamination in Laminates with Angle Ply Matrix Cracks. Part 2: Delamination Fracture Analysis and Fatigue Characterization by :
Download or read book Local Delamination in Laminates with Angle Ply Matrix Cracks. Part 2: Delamination Fracture Analysis and Fatigue Characterization written by and published by . This book was released on 1991 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Local Delamination in Laminates with Angle Ply Matrix Cracks. Part 1: Tension Tests and Stress Analysis by :
Download or read book Local Delamination in Laminates with Angle Ply Matrix Cracks. Part 1: Tension Tests and Stress Analysis written by and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Local Delamination in Laminates with Angle Ply Matrix Cracks, Part II by : TK. O'Brien
Download or read book Local Delamination in Laminates with Angle Ply Matrix Cracks, Part II written by TK. O'Brien and published by . This book was released on 1993 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constant amplitude tension-tension fatigue tests were conducted on AS4/3501-6 graphite epoxy (02/?2/-?2)s laminates, where ? was 15, 20, 25, or 30°. 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 - ?° plies and the subsequent onset of local delaminations in the ?/-? interface at the intersection of the matrix cracks and the free edge.
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 Adm Nasa Publisher :Independently Published ISBN 13 :9781728951881 Total Pages :32 pages Book Rating :4.9/5 (518 download)
Book Synopsis Residual Thermal and Moisture Influences on the Strain Energy Release Rate Analysis of Local Delaminations from Matrix Cracks by : National Aeronautics and Space Adm Nasa
Download or read book Residual Thermal and Moisture Influences on the Strain Energy Release Rate Analysis of Local Delaminations from Matrix Cracks written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-19 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis utilizing laminated plate theory is developed to calculate the strain energy release rate associated with local delaminations originating at off-axis, single ply, matrix cracks in laminates subjected to uniaxial loads. The analysis includes the contribution of residual thermal and moisture stresses to the strain energy released. Examples are calculated for the strain energy release rate associated with local delaminations originating at 90 degrees and angle-ply (non-90 degrees) matrix ply cracks in glass epoxy and graphite epoxy laminates. The solution developed may be used to assess the relative contribution of mechanical, residual thermal, and moisture stresses on the strain energy release rate for local delamination for a variety of layups and materials. Obrien, T. K. Langley Research Center RTOP 505-63-50-04...
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:
Book Synopsis Analysis of Delamination in Cross Ply Laminates Initiating from Impact Induced Matrix Cracking by :
Download or read book Analysis of Delamination in Cross Ply Laminates Initiating from Impact Induced Matrix Cracking written by and published by . This book was released on 1991 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
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 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 Residual Thermal and Moisture Influences on the Analysis of Local Delaminations by : TK. O'Brien
Download or read book Residual Thermal and Moisture Influences on the Analysis of Local Delaminations written by TK. O'Brien and published by . This book was released on 1992 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: An analysis using laminated plate theory is developed to calculate the strain energy release rate associated with local delaminations originating at off-axis, angle-ply, matrix cracks in laminates subjected to uniaxial loads. The analysis includes the contribution of residual thermal and moisture stresses to the strain energy released. Examples are calculated for the strain energy release rate associated with local delaminations originating at 90° and angle-ply (non 90°) matrix-ply cracks in glass-epoxy and graphite-epoxy laminates. The solution developed may be used to assess the relative contribution of mechanical, residual thermal, and moisture stresses on the strain energy release rate for local delamination for a variety of layups and materials.
Book Synopsis Analysis of Matrix Cracking and Local Delamination in (0/?/ - ?)s Graphite Epoxy Laminates Under Tensile Load by : SA. Salpekar
Download or read book Analysis of Matrix Cracking and Local Delamination in (0/?/ - ?)s Graphite Epoxy Laminates Under Tensile Load written by SA. Salpekar and published by . This book was released on 1993 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several three-dimensional element analyses of (0/?/-?), graphite epoxy laminates, where ? = 15, 20, 25, 30, and 45°, subjected to axial tensile load, were performed. The interlaminar stresses in the ?/-? interface were calculated with and without a matrix crack in the central -? 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 the free edge. The analysis of local delamination from the -? 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. To examine the stress state causing the matrix cracking, the maximum principal normal stress in a plane perpendicular to the fiber direction in the -? 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 increased through the ply thickness and reached a very high tensile value at the ?/-? interface indicating that the crack in the -? ply may initiate at the ?/-? interface. Predicted crack profiles on the laminate edge in the -? ply were constructed from the principal stress directions. The cracks were found to be more curved for layups with smaller ? angles, which is consistent with experimental observations in the literature.
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...
