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Random Delamination Of Graphite Epoxy Laminated Composites
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Book Synopsis Random Delamination of Graphite/epoxy Laminated Composites by : Chao Zhang
Download or read book Random Delamination of Graphite/epoxy Laminated Composites written by Chao Zhang and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The delamination failure of laminated composites exhibits two distinct characteristics; (1) the corresponding failure strengths display considerable scatter, and (2) the morphologies of the fracture surfaces and the interlaminar strengths are dependent on the magnitude of the fiber orientation difference (abbreviated as FOD below) angle between the two adjacent plies of the interface. A variational solution technique is developed to determine the three-dimensional edge effect stresses around pin-loaded holes in symmetric laminated composites. The stress state around the holes is divided into two parts, one the in-plane stress state determined using the Classical Laminated Plate Theory (CLPT) and the other the boundary layer stress state arising from the edge effects which only exists in the vicinity of the holes. The equilibrium equations of boundary layer stress state with zeroth-order approximation are derived from a set of power expansions. Analytical solutions for the boundary layer stress state are then obtained by imposing zeroth-order stress functions on the variational principle of complementary energy. The developed variational solution technique is versatile, which can be used to calculate the edge effect stresses at straight free edges, curved free edges and pin-loaded hole edges with or without friction in laminated composites. An experimental investigation is conducted to study the effects of fiber orientations on the interlaminar shear (ILS) strengths of CYTEC ® G40-800/5276-1 graphite/epoxy laminated composites. The ILS strengths at the [straight theta]-interfaces ([straight theta] = 0°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80° and 90°), around which the two neighboring plies have a FOD angle [straight theta], are experimentally characterized using the modified double notch shear specimens with an elaborately designed layup. A stochastic simulation model is proposed in a phenomenological sense, in which the probabilistic dependence of ILS strengths on the FOD angles [straight theta] is simulated as a non-Gaussian nonstationary stochastic process within the bounded interval [0,?/2]. Two innovative delamination criteria in terms of quadratic and cubic polynomials in each case, are developed based on the Malmeister strength theory and Hashin assumption. The intent of the developed criteria is to include the effects of [straight theta]-dependent and directionally-dependent interlaminar strengths into the failure evaluation of laminated composites, as demonstrated by the experiments in the present thesis. (Abstract shortened by UMI.).
Book Synopsis Delamination Buckling of Composite Materials by : L. Kachanov
Download or read book Delamination Buckling of Composite Materials written by L. Kachanov and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: LIOn Delamination of Laminated Composites (a) Fiber-Reinforced Composites Considerable technological advances in the production of high-strength fibers (graphite, boron, etc.) have led to a wide use of light high-strength composite materials (graphite epoxy, boron-epoxy, etc.). It is expedient, to make thin walled composite rods, plates, and shells from such materials. Plates can be made by bonding a set of unidirectional thin fiber layers, Fig.l.l. Such plates are orthotropic, as a rule. A random short-fiber composite is shown in Fig. 1.2. Fiber-reinforced composites are widely used in thin-walled aircraft structures because of their specific high strength. For example, the graphite-epoxy composite is characterized by a unidirectional tensile strength of 1.4 GPa while the density is 1.6 Mg/rrt? . For comparison, we may take a steel (steel 4340) whose corresponding properties are identified by values like 1.2 GPa and 7.8 Mg/rrt? . 1. INTRODUCTION Figure 1.1 2 1.1. On Delamination of Laminated Composites Figure 1.2 3 1. INTRODUCTION It is characteristic for laminated plastic material to possess a fairly low bonding. Therefore, low-velocity impacts and defects in manufacturing lead to local delamination. (b) Linear Problems of Delamination Buckling Delamination can significantly reduce the compressive strength and stiffness of the laminate. Local delamination can be considered as a crack in the bond. Under buckling there appears a high interlaminate stress at the crack edge that leads to a spreading of the crack. Delamination growth can lead to structural instability.
Book Synopsis Mixed-mode Strain-energy-release Rate Effects on Edge Delamination of Composites by : Kevin T. O'Brien
Download or read book Mixed-mode Strain-energy-release Rate Effects on Edge Delamination of Composites written by Kevin T. O'Brien and published by . This book was released on 1983 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Matrix Cracking-Induced Delamination Propagation in Graphite/Epoxy Laminated Composites Due to a Transverse Concentrated Load by : S. Liu
Download or read book Matrix Cracking-Induced Delamination Propagation in Graphite/Epoxy Laminated Composites Due to a Transverse Concentrated Load written by S. Liu and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was performed to study the delamination propagation induced by matrix cracking in graphite/epoxy laminated composite beams subjected to transverse concentrated loading. The major focus of the study was to fundamentally understand the interaction between matrix cracking and delamination propagation in laminated composites resulting from transverse loadings. A nonlinear finite element analysis combined with a failure criterion and fracture mechanics was developed for modeling the damage initiation and propagation in composite beams subjected to a concentrated line load. A contact analysis based on the Lagrange multiplier technique was also adopted for modeling the contactslip condition of delamination and matrix crack surfaces during loading. Results of the calculations based on the analysis were compared favorably with the existing data and the data generated during the investigation.
Book Synopsis Dynamic Delamination Crack Propagation in a Graphite/epoxy Laminate by :
Download or read book Dynamic Delamination Crack Propagation in a Graphite/epoxy Laminate written by and published by . This book was released on 1991 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials by : Roderick H. Martin
Download or read book Composite Materials written by Roderick H. Martin and published by ASTM International. This book was released on 1986 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723036156 Total Pages :160 pages Book Rating :4.0/5 (361 download)
Book Synopsis Dynamic Delamination Crack Propagation in a Graphite/Epoxy Laminate by : National Aeronautics and Space Administration (NASA)
Download or read book Dynamic Delamination Crack Propagation in a Graphite/Epoxy Laminate written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic delamination crack propagation in a (90/0) 5s Graphite/Epoxy laminate with an embedded interfacial crack was investigated experimentally using high speed photography. The dynamic motion was produced by impacting the beamlike laminate specimen with a silicon rubber ball. The threshold impact velocities required to initiate dynamic crack propagation in laminates with varying initial crack positions were determined. The crack propagation speeds were estimated from the photographs. Results show that the through the thickness position of the embedded crack can significantly affect the dominant mechanism and the threshold impact velocity for the onset of crack movement. If the initial delamination is placed near the top of bottom surface of the laminate, local buckling of the delaminated plies may cause instability of the crack. If the initial delamination lies on the midplane, local buckling does not occur and the initiation of crack propagation appears to be dominated by Mode II fracture. The crack propagation and arrest observed was seen to be affected by wave motion within the delamination region. Grady, J. E. and Sun, C. T. Unspecified Center CRACK ARREST; CRACK PROPAGATION; DELAMINATING; FAILURE ANALYSIS; FRACTURE STRENGTH; GRAPHITE-EPOXY COMPOSITES; IMPACT TESTS; STRAIN ENERGY RELEASE RATE; FINITE ELEMENT METHOD; HIGH SPEED CAMERAS; HIGH SPEED PHOTOGRAPHY; IMPACT STRENGTH; TOUGHNESS...
Book Synopsis Delamination Growth in a Notched Graphite/Epoxy Laminate Under Compression Fatigue Loading by : AF. Blom
Download or read book Delamination Growth in a Notched Graphite/Epoxy Laminate Under Compression Fatigue Loading written by AF. Blom and published by . This book was released on 1985 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper is concerned with the propagation of delamination in a graphite/epoxy composite laminate with an unloaded circular hole subjected to compression fatigue loading. Experimental and theoretical aspects of the problem are investigated.
Book Synopsis Sensitivity of Graphite/epoxy to Implanted Delaminations Under Tensile Load by : Thomas F. Grapes
Download or read book Sensitivity of Graphite/epoxy to Implanted Delaminations Under Tensile Load written by Thomas F. Grapes and published by . This book was released on 1985 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation into the effects of implanted delamination on the tensile strength and stress-strain behavior of a graphite/epoxy laminate [45/0/-45]s was performed. No significant effects on the strength were observed and no delamination growth was detected. The tensile strain effects of delamination were somewhat ambiguous, however
Book Synopsis Delamination Suppression in Graphite/epoxy Composites Via Efficient Use of Film Adhesive Layers by : Narendra Venugopal Bhat
Download or read book Delamination Suppression in Graphite/epoxy Composites Via Efficient Use of Film Adhesive Layers written by Narendra Venugopal Bhat and published by . This book was released on 1989 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Delamination suppression by the efficient placement of film adhesive interlayers in [±157/07]s AS4/3501-6 graphite/epoxy laminates was investigated. Efficiency was achieved by placing film adhesive in the form of strips at the free edge at delamination critical interfaces only. Five types of laminates were tested; the first type were control specimens without film adhesive, the second type had a full-width ply of film adhesive, and the remaining three types had strips of film adhesive 3 mm, 6 mm and 9 mm wide, at the free edges of the laminate. All film adhesive was placed at the +15°/-15° interface. For all the specimens with film adhesive, the delamination initiation load was about 50% higher than for the control specimens. The width of the film adhesive strips, up to manufacturable sizes, did not affect the suppression of delamination. The specimens with film adhesive also failed at stresses which were about 40% higher than the control specimens. Again, no significant difference was observed between the fracture stresses of specimens with different widths of film adhesive. An analysis was developed to predict the interlaminar stresses at the dropoff and showed that these interlaminar stresses at the dropoff are negligibly small as compared to the interlaminar stresses at the free edge of the specimen. Specimens with film adhesive plies at the +15°/-15° interface and delamination implants of width 3 mm, 6 mm, and 9 mm at the free edge at the +15°/FA interface were tested to examine the effect of film adhesive on growth of delamination Specimens with 6 mm and 9 mm wide delamination implants showed delamination behavior similar to the control specimens, indicating that the film adhesive was not capable of suppressing the growth of delamination. The behavior of specimens with 3 mm wide delamination implants, however, conformed to that of the specimens with film adhesive. This indicates the possibility of the existence of a critical delamination size necessary for growth to occur.
Book Synopsis An Analysis of Delamination in Drilling Composite Materials by : Tin-Lup Wong
Download or read book An Analysis of Delamination in Drilling Composite Materials written by Tin-Lup Wong and published by . This book was released on 1981 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Slow, Stable Delamination in Graphite/epoxy Composites by : Hamid Razi
Download or read book Slow, Stable Delamination in Graphite/epoxy Composites written by Hamid Razi and published by . This book was released on 1982 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mode I Delamination of Unidirectional Graphite/epoxy Composite Under Complex Load Histories by : James Scott Cullen
Download or read book Mode I Delamination of Unidirectional Graphite/epoxy Composite Under Complex Load Histories written by James Scott Cullen and published by . This book was released on 1981 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
