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The Effect Of Thickness On Interlaminar Stresses And Delamination
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Book Synopsis The Effect of Thickness on Interlaminar Stresses and Delamination by : Paul A. Lagace
Download or read book The Effect of Thickness on Interlaminar Stresses and Delamination written by Paul A. Lagace and published by . This book was released on 1986 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of ply and laminate thickness on the fracture of graphite/epoxy laminates induced by delamination was investigated. Five laminate types were manufactured from ASl/3501-6 graphite/epoxy and tested:[±15n]s', [±15n/0n]s', [0n/±15n]s', [±45n/0n]s' and [0n/±15]s]n'. "Effective ply thickness" was varied by stacking several plies of the same angular orientation together. It was found that an increase in effective ply thickness caused a decrease in fracture stress resulting from delamination in all cases. Interlaminar stress calculations indicate that this results from the fact that the region of high interlaminar stresses increases as the effective ply thickness increases. These calculations also suggest that interlaminar shear stresses are at least as important in causing delamination as interlaminar normal stresses. "Back-to-back" [0n/±15]s]n'. laminates were found to have the same strength for values of n from one to three. This indicates that reductions in strength are not simply a laminate thickness phenomenon but are related to the effective ply thickness.
Book Synopsis The Effect of Thickness on Interlaminar Stresses and Delamination in Straight-Edged Laminates by : P. Lagace
Download or read book The Effect of Thickness on Interlaminar Stresses and Delamination in Straight-Edged Laminates written by P. Lagace and published by . This book was released on 1987 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of ply and laminate thickness on the fracture of graphite/epoxy laminates induced by delamination was investigated. Five laminate types were manufactured from AS1/3501-6 graphite/epoxy and tested: [±15n]s, [±15n/0n]s, [0n/±15n]s, [±45n/0n]s, and [[0/±15]s]n. "Effective ply thickness" was varied by stacking several plies of the same angular orientation together. It was found that an increase in effective ply thickness caused a decrease in fracture stress resulting from delamination in all cases. Interlaminar stress calculations indicate that this results from the fact that the region of high interlaminar stresses increases as the effective ply thickness increases. These calculations also suggest that interlaminar shear stresses are at least as important in causing delamination as interlaminar normal stresses. "Back-to-back" [[0/±15]s]n laminates were found to have the same strength for values of n from one to three. This indicates that reductions in strength are not simply a laminate thickness phenomenon but are related to the effective ply thickness.
Book Synopsis Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination by :
Download or read book Analysis of Interlaminar Stresses in Thick Composite Laminates with and Without Edge Delamination written by and published by . This book was released on 1984 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Delamination and Debonding of Materials by : W. Steven Johnson
Download or read book Delamination and Debonding of Materials written by W. Steven Johnson and published by ASTM International. This book was released on 1985 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Role of Delamination and Interlaminar Fatigue in the Failure of Laminates with Ply Dropoffs by : Dong Jin Shim
Download or read book Role of Delamination and Interlaminar Fatigue in the Failure of Laminates with Ply Dropoffs written by Dong Jin Shim and published by . This book was released on 2002 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytical and experimental investigations were conducted on laminates with ply dropoffs to better understand the interlaminar stress field and delamination/damage characteristics in such laminates, as well as the relationship between the two based on the strength of materials approach. To gain key insights into the mechanisms and structural parameters that cause interlaminar stresses, analytical models for laminates with simple ply dropoff configurations were developed based on a systematic and hierarchical approach. Mathematically, these individual models are formulated using the stress function method in which the form of the admissible stress field is assumed a priori based on the stress field from the classical laminated plate theory and other functional constraints of the problem. The results are validated via comparisons with numerical solutions from previous investigations and as performed in the current work. Various structural parameters such as the taper angle and the location of the terminated plies are found to affect the interlaminar stress distribution. Careful consideration of the characteristics and trends of the interlaminar stresses in such laminates reveals that two fundamental mechanisms give rise to interlaminar stresses: the termination effect, that is caused by the load transfer from the terminated ply group to the continuous plies; and the offset effect, that is caused by the redistribution of the load from the undropped region to the dropped region in the outer continuous plies through an offset in the through thickness direction. These mechanisms, the factors that affect them, and their utility are described and discussed in detail. Factors of particular importance are the magnitudes of the far-field loads in the terminated and the outer continuous ply groups, the offset distance, and the taper angle. Experiments are conducted on unidirectional laminate configurations under static and cyclic loads to establish delamination/damage trends when the number and location of the terminated plies are varied. Under both loading conditions, delamination is found to be the dominant damage mode, although other modes, e.g., ply splits, occur. In certain types of specimens under cyclic loading, delaminations in different regions have different growth characteristics causing delaminations in one region to be a greater concern than in another region because the length of the delaminations increases indefinitely. In general, the experimental observations regarding delamination/damage are consistent with expectations based on the stress analysis. Delaminations are generally observed along interfaces where the interlaminar stresses are greatest, and static delamination loads are higher in laminates with lower interlaminar stresses. Quantitative predictions of the delamination loads using the Quadratic Delamination Criterion with the average stress method do not agree as well with the experimental data because a single value for the averaging length could not be obtained. The possible causes for the apparent non-uniqueness of the averaging length and its implications are further discussed. Based on this investigation, further recommendations for work on laminates with ply dropoffs are proposed.
Book Synopsis Free-edge Delamination: Laminate Width and Loading Conditions Effects by : P. L. N. Murthy
Download or read book Free-edge Delamination: Laminate Width and Loading Conditions Effects written by P. L. N. Murthy and published by . This book was released on 1987 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interlaminar Response of Composite Materials by : N.J. Pagano
Download or read book Interlaminar Response of Composite Materials written by N.J. Pagano and published by Elsevier. This book was released on 2012-12-02 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the topics of major importance toward understanding the most feared failure mode in composite laminates, namely delamination. There are few books at present that describe the phenomenon of composite laminate failure by delamination in such detail.Written by pioneers and principal researchers in various aspects of composite delamination, starting from basic principles to the most current research findings, the work provides a complete study of the theoretical and experimental aspects of composite delamination in one volume.
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 The Effect of Ply Thickness on the Free Edge Delamination of Graphite/epoxy Laminates by : John Charles Brewer
Download or read book The Effect of Ply Thickness on the Free Edge Delamination of Graphite/epoxy Laminates written by John Charles Brewer and published by . This book was released on 1985 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: The initiation of delamination in graphite/epoxy laminates was investigated both analytically and experimentally and the effect of effective ply thickness on this phenomenon assessed. Three different laminate families were investigated: [±15n]s,[±15n/0n]s, and [0n/±15n]s, with the normalized effective ply thickness, n, varying from 1 to 5. Delamination initiation was detected using the load drop technique in conjunction with edge replication. Initiation was determined to have occurred when a load drop was detected and a delamination initiation was confirmed on the replication of the specimen edge. Two different analytical techniques were used t-o correlate the measured delamination initiation stresses: the previously proposed strain energy release rate approach and the Quadratic Delamination Criterion which is introduced herein. The strain energy release rate approach was unable to accurately correlate the data for two of the three laminate families as the data clearly showed that the critical value of strain energy release rate is significantly dependent on the effective ply thickness. The Quadratic Delamination Criterion, an average stress criterion which involves the comparison of the calculated interlaminar normal stress and interlaminar shear stress ([sigma]1z) to their related strength parameters, is proposed and shows excellent correlation with the delamination initiation stress data.
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 Composite Materials by : H. Thomas Hahn
Download or read book Composite Materials written by H. Thomas Hahn and published by ASTM International. This book was released on 1986 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials by : Glenn C. Grimes
Download or read book Composite Materials written by Glenn C. Grimes and published by ASTM International. This book was released on 1992 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation In papers presented at the Tenth ASTM Conference on Composite Materials, held in San Francisco, April 1990, important composite materials technical issues are discussed in eight sections: compression test methodology analysis and development; general test methodology analysis and development; material mechanical properties and failure criteria; advanced materials analysis and test; analysis, test, and certification of structure; quality assurance and process control; interlaminar fracture analysis and test; and damage, flows, and repair. Member price, $95. Annotation copyrighted by Book News, Inc., Portland, OR.
Download or read book NASA Reference Publication written by and published by . This book was released on 1977 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Central Delamination in Glass/epoxy Laminates by : Seongho Hong
Download or read book Central Delamination in Glass/epoxy Laminates written by Seongho Hong and published by . This book was released on 1990 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Interlaminar Stresses in Laminated Composites Using the Resin-layer Concept and Cubic Zig-zag Plate Theory by : Venugopal Amineni
Download or read book Investigation of Interlaminar Stresses in Laminated Composites Using the Resin-layer Concept and Cubic Zig-zag Plate Theory written by Venugopal Amineni and published by . This book was released on 1997 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analytical and Experimental Investigation of Edge Delamination in Laminates Subjected to Tension, Bending, and Torsion by :
Download or read book An Analytical and Experimental Investigation of Edge Delamination in Laminates Subjected to Tension, Bending, and Torsion written by and published by . This book was released on 1989 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Residual Stresses in Composite Materials by : Mahmood M. Shokrieh
Download or read book Residual Stresses in Composite Materials written by Mahmood M. Shokrieh and published by Woodhead Publishing. This book was released on 2014-02-14 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stresses are a common phenomenon in composite materials. They can either add to or significantly reduce material strength. Because of the increasing demand for high-strength, light-weight materials such as composites and their wide range of applications in the aerospace and automotive industries, in civil infrastructure and in sporting applications, it is critical that the residual stresses of composite materials are understood and measured correctly. The first part of this important book reviews destructive and non-destructive testing (NDT) techniques for measuring residual stresses. Various mathematical (analytical and numerical) methods for calculation of residual stresses in composite materials are also presented. Chapters in the first section of the book discuss the simulated hole drilling method, the slitting/crack compliance method, measuring residual stresses in homogeneous and composite glass materials using photoelastic techniques, and modeling residual stresses in composite materials. The second part of the book discusses residual stresses in polymer matrix, metal-matrix and a range of other types of composites. Moreover, the addition of nanoparticles to the matrix of polymeric composites as a new technique for reduction of residual stresses is discussed. Residual stresses in composite materials provides a comprehensive overview of this important topic, and is an invaluable reference text for both academics and professionals working in the mechanical engineering, civil engineering, aerospace, automotive, marine and sporting industries. Reviews destructive and non-destructive testing (NDT) techniques for measuring residual stresses Discusses residual stresses in polymer matrix, metal-matrix and other types of composite Considers the addition of nanoparticles to the matrix of polymeric composites as a new technique for reduction of residual stresses
