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Dissertations / Theses on the topic 'Composite materials Delamination'

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Published: 4 June 2021

Last updated: 6 September 2023

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1

Whitcomb, J. D. "Instability-related delamination growth of embedded and edge delaminations." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/77755.

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Compressive loads can cause local buckling in composite laminates that have a near-surface delamination. This buckling causes load redistribution and secondary loads, which in turn cause interlaminer stresses and delamination growth. The goal of this research effort was to enhance the understanding of this instability-related delamination growth in laminates containing either an embedded or an edge delamination. There were three primary tasks: 1) development of a geometrically nonlinear finite element analysis named NONLIN3D; 2) performance of a parametric analytical study to determine the e

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2

Van, Hoof J. "Modelling of impact induced delamination in composite materials." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0028/NQ52335.pdf.

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3

Van, Hoof Jack (Jacobus Franciscus Adrianus Maria) Carleton University Dissertation Engineering Mechanical and Aerospace. "Modelling of impact induced delamination in composite materials." Ottawa, 1999.

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4

Malik, Basharat U. "Fatigue delamination growth under cyclic compression in unidirectional composites." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/12094.

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5

Awal, Mohammad A. 1959. "Transient response of delamination, intersecting and transverse cracks in layered composite plates." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276955.

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A numerical method is developed to determine the dynamic behavior of delamination and transverse cracks in multilayered plates. The plate is subjected to a time dependent antiplane shear stress field which is acting on the plate surfaces. The interaction of waves diffracted at the crack tip with those reflected at the plate boundaries and transmitted at the material interface makes the problem very complicated, so analytical study of this problem cannot be carried out with our present state of knowledge; hence the problem is solved numerically. The finite element equations are obtained by vari

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6

Gambone, Livio R. "The effect of R-ratio on the mode II fatigue delamination growth of unidirectional carbon/epoxy composites." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/29968.

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An investigation of the effect of R-ratio on the mode II fatigue delamination of AS4/3501-6 carbon/epoxy composites has been undertaken. Experiments have been performed on end notched cantilever beam specimens over a wide range of R-ratios (-l ≤R ≤0.50). The measured delamination growth rate data have been correlated with the mode II values of strain energy release rate range ∆G[formula omitted]), maximum strain energy release rate (G[formula omitted]) and stress intensity factor range (∆K[formula omitted]). The growth rate is dependent on the R-ratio over the range tested. For a constant leve

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7

Tenek, Lazarus H. "Delamination dynamics and vibrothermographic-thermoelastic evaluation of advanced composite materials." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10312009-020116/.

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8

Lee, Jaehong. "Vibration, buckling and postbuckling of laminated composites with delaminations." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-170322/.

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9

Barlas, Fatma Aylin. "Variable complexity modeling of postbuckled stiffeners for delamination initiation." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-10312009-020245/.

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10

Chang, Cherng-Chi. "Finite element analysis of laminated composite free-edge delamination specimens /." The Ohio State University, 1987. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487584612162791.

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11

Xu, Ying. "Detection of delamination in composites with fiber optic sensor /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20XU.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2004.<br>Includes bibliographical references (leaves 194-209). Also available in electronic version. Access restricted to campus users.

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12

Garcia, Jorge David Aveiga. "A delamination propagation model for glass fiber reinforced laminated composite materials." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-31072018-143609/.

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The employment of composite materials in the aerospace industry has been gradually considered due to the fundamental lightweight and strength characteristics that these type of materials offer. The science material and technological progress that has been reached, matches perfectly with the requirements for high-performance materials in aircraft and aerospace structures, thus, the development of primary structure elements applying composite materials became something very convenient. It is extremely important to pay attention to the failure modes that influence composite materials performances

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13

Huang, Haiying. "Single and multiple delamination behavior in composite plates." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/12541.

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14

Stevanović, Dejan. "Delamination properties of a vinyl-ester/glass fibre composite toughened by particle-modified interlayers /." View thesis entry in Australian Digital Theses Program, 2001. http://thesis.anu.edu.au/public/adt-ANU20030421.212730/index.html.

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15

Harries, Richard. "Process modeling and interfacial delamination in peripheral array packages." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/16622.

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16

Dávila, Carlos G. "Delamination initiation in postbuckled dropped-ply laminates /." This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-07282008-134842/.

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17

Palmer, David W. "The effect of internal delamination on unsymmetric laminated composite plates." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/12021.

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18

La, Saponara Valeria. "Crack branching in cross-ply composites." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/11973.

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19

Barbieri, Ettore. "Meshfree methods for the analysis of composite materials." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558846.

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The proposed research is essentially concerned on numerical simulation of materials and structures commonly used in the aerospace industry. The work is primarily focused on the study of the fracture mechanics with emphasis to composite materials, which are widely employed in the aerospace and automotive industry. Since human lives are involved, it is highly important to know how such structures react in case of failure and, possibly, how to prevent them with an adequate design. It has become of primary importance to simulate the material response in composite, especially considering that even

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20

Tan, Xinyuan. "Co-cured composite joint strength investigation based on behavior characterization of [0/±θ/90]s family". Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26578.

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Joints provide a path for transfer of load and are important components in an assembly of structures, particularly in translating joint strength improvements directly to significant cost savings. This cost savings is more evident in composite joints since manufacturing of more complex single piece components results in a reduction of both part count and labor. An improvement in joint strength for co-cured composite joints through minimized free-edge delamination was investigated for quasi-isotropic [0/±45/90]s lay-up based on the quantitative assessments of the quasi-static and fatigue strengt

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21

Shen, Luming. "Multi-scale modeling and simulation of multi-physics in film delamination /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3144456.

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22

Píttaro, Agustín Alejandro. "Numerical evaluation of mixed mode I and II delamination in composite materials." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16172/.

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23

Maranon, Alejandro. "Characterising delamination in composite materials : a combined genetic algorithm - finite element approach." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/7688.

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A novel delamination identification technique based on a low-population genetic algorithm for the quantitative characterisation of a single delamination in composite laminated panels is developed, and validated experimentally The damage identification method is formulated as an inverse problem through which system parameters are identified. The input of the inverse problem, the central geometric moments (CGM), is calculated from the surface out-of-plane displacements measurements of a delaminated panel obtained from Digital Speckle Pattern Interferometry (DSPI). The output parameters, the plan

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24

Zhao, Dongming. "Interlaminar fracture behavior of woven fabric composites and mode III delamination analysis." Diss., Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/10075.

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25

Kuriakose, Sunil. "Analysis of damage in composite laminates under bending." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/12054.

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26

Bruhschwein, Taylor John. "Identification of Delamination Defects in CFRP Materials through Lamb Wave Responses." Thesis, North Dakota State University, 2014. https://hdl.handle.net/10365/27328.

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Delamination is currently a largely undetectable form of damage in composite laminate materials. This thesis will develop a method to more easily detect delamination damage within composite materials. Using finite element analysis modeling and lab testing, a new method from interpreting the results obtained from existing structural health monitoring techniques is developed. Lamb waves were introduced and recorded through an actuator and sensors made of piezoelectric material. The data was then analyzed through a novel data reduction method using the Fast Fourier Transform (FFT). Using the data

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27

Ferrie, Catherine H. "Effect of transverse shear on the postbuckling and growth characteristics of delaminated composites." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/12355.

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28

Shalev, Doron. "Prediction model for the onset of edge-effect delamination at holes in composite laminates." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/81007.

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Composite laminates are prone to delamination at free edges, straight edges or at holes, due to the mismatch at interfaces where two adjacent plies have different fiber orientations and/or different material properties. The linear analysis of the mismatch at the edge results in a mathematical singularity. That phenomenon occurs in a boundary layer and has to be treated mathematically and physically as such. In the literature it is called the "Boundary Layer Effect" or simply the "Edge Effect". It is of great importance to recognize and be able to predict delamination locations at edges prone t

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29

Dávila, Carlos G. "Delamination initiation in postbuckled dropped-ply laminates." Diss., Virginia Tech, 1991. http://hdl.handle.net/10919/38915.

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30

Shor, Ofir. "Adaptive insertion of cohesive elements for simulation of delamination in laminated composite materials." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59338.

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Composite materials are increasingly being used in advanced structural ap- plications. Debonding of adjacent laminate layers, also known as delamination, is considered to be one of the most dominant damage mechanisms affecting the behavior of composite laminates. Various numerical methods for simulating delamination in composite materials do exist, but they are generally limited to small-scale structures due to their complexity and high numerical cost. In this thesis, a novel technique aimed to allow efficient simulation of delamination in large-scale laminated composite structures is presente

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31

Minnaar, Karel. "Experimental and numerical analyses of damage in laminate composites under low velocity impact loading." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15812.

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32

Wolfe, David R. "Delamination buckling, postbuckling, and growth in axially loaded beam-plates." Thesis, Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/80114.

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The purpose of this study is to develop a simple one-dimensional model to analyze axially loaded beam-plates containing cracks which extend through the thickness of the beam-plates. Although the material analyzed is isotropic, these cracks will be referred to as delaminations. Buckling, postbuckling, and growth of delaminations in these beam-plates will be analyzed. A finite element method in which all of the terms of the stiffness matrices are obtained by exact integration is employed to determine the linear buckling load and postbuckling solution. The energy release rate is then determined u

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33

Eswonia, Eugene Everett. "Effects of Delamination on Composite Sandwich Structures Under Static and Fatigue Loading." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/222.

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This thesis will present the experimental and numerical analysis of composite sandwich structures under monotonic and fatigue loading. The sandwich skins were made of fiberglass and the core used was a closed cell PVC foam. Initial delaminations were introduced into the sandwich structures during manufacturing to see the effect of delamination size on the ultimate strength and monotonic fracture. Fiberglass rods, called shear keys, added to the foam core to determine whether or not they increased the strength of the test specimens. Furthermore, shear key locations were also varied and their

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34

Muñoz, Dante Mejia. "Finite element modeling of nondestructive test methods used for detection of delamination in hot mix asphalt pavements." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2009. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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35

Barbero, Ever J. "On a generalized laminate theory with application to bending, vibration, and delamination buckling in composite laminates." Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54484.

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In this study, a computational model for accurate analysis of composite laminates and laminates with including delaminated interfaces is developed. An accurate prediction of stress distributions, including interlaminar stresses, is obtained by using the Generalized Laminate Plate Theory of Reddy in which layer-wise linear approximation of the displacements through the thickness is used. Analytical, as well as finite-element solutions of the theory, are developed for bending and vibrations of laminated composite plates for the linear theory. Geometrical nonlinearity, including buckling and post

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36

Machado, Carla Maria Moreira. "Empirical models for quantification of machining damage in composite materials." Doctoral thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/9058.

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Dissertação para obtenção do Grau de Doutor em Engenharia Mecânica<br>The tremendous growth which occurs at a global level of demand and use of composite materials brings with the need to develop new manufacturing tools and methodologies. One of the major uses of such materials, in particular plastics reinforced with carbon fibres, is their application in structural components for the aircraft industry with low weight and high stiffness. These components are produced in near-final form but the so-called secondary processes such as machining are often unavoidable. In this type of industry, dri

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37

Lopez-Armas, Carlos Alberto. "Evaluation of constitutive laws for the computer simulation of fatigue driven delamination in composite materials." Thesis, Imperial College London, 2008. http://hdl.handle.net/10044/1/1384.

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A simple mathematical model (cylinder model) is proposed and used to evaluate various constitutive laws used in finite element codes to simulate fatigue-driven delamination in composite materials. The cylinder model has one degree of freedom and allows the evaluation of several parameters of the constitutive laws in an ffcient and accurate way without worrying about the complex interactions that may arise while using a nite element code. This cylinder model enabled a large number of analysis to be performed in a relatively short time and made possible parametric studies with tens of thousands

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38

CERIONI, AGOSTINO. "Simulation of delamination in composite materials under static and fatigue loading by cohesive zone models." Doctoral thesis, Università degli Studi di Cagliari, 2009. http://hdl.handle.net/11584/266000.

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This thesis is a dissertation focusing on the mechanics of delamination in laminated composites. Delamination, one of the most critical forms of failure in composite materials, may occur as a result of many causes and different types of loading, such as, for example, static or cyclic loading. This work presents an examination of the potential of cohesive interface elements for the prediction of delamination propagation under quasi-static mode I, mode II and mixed mode (I and II) loading, by a comparison between experimental tests and parametric analyses in order to evaluate the sensitivity of

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39

Swindeman, Michael James. "A Regularized Extended Finite Element Method for Modeling the Coupled Cracking and Delamination of Composite Materials." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324605778.

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40

Lallemant, Lucas. "Numerical homogenization of a rough bi-material interface." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41111.

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The mechanical reliability of electronic components has become harder and harder to predict due to the use of composite materials. One of the key issues is creating an accurate model of the delamination mechanism, which consists in the separation of two different bounded materials. This phenomenon is a very challenging issue that is investigated in the Nano Interface Project (NIP), in which this thesis is involved. The macroscopic adhesion force is governed by several parameters described at different length scales. Among these parameters, the roughness profile of the interface has a pronoun

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41

Kolhar, Arvind Shrikant. "Analysis of delamination in drilling of circular plate composite materials with a multi-facet drill bit." Thesis, Wichita State University, 2007. http://hdl.handle.net/10057/1510.

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Delamination is recognized as one of the most critical defects that can result from the machining of composites. Delamination has been a major form of failure in drilled composite materials due to the composite’s lack of strength in the direction of drilling, which results in poor surface finish, reduction in bearing strength, reduction in structural integrity, and ultimately poor performance of the composite. Delamination due to drilling has been a major research interest for many years, and a considerable amount of work has been done to reduce it. This thesis work involved deriving a formula

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42

Kolhar, Arvind Shrikant Bahr Behnam. "Analysis of delamination in drilling of circular plate composite materials with a multi-facet drill bit /." Thesis, A link to full text of this thesis in SOAR, 2007. http://hdl.handle.net/10057/1510.

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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering<br>Delamination is recognized as one of the most critical defects that can result from the machining of composites. Delamination has been a major form of failure in drilled composite materials due to the composite⁰́₉s lack of strength in the direction of drilling, which results in poor surface finish, reduction in bearing strength, reduction in structural integrity, and ultimately poor performance of the composite. Delamination due to drilling has been a major research interest for many years, and

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43

Tran, Tony D. "An Investigation of Initially Delaminated Composite Sandwich with Delamination Arrest Mechanism under Buckling Loading." DigitalCommons@CalPoly, 2010. https://digitalcommons.calpoly.edu/theses/428.

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This thesis involves the development of a fiberglass-foam composite sandwich structure with the introduction of delamination arrestment keys; therefore, a study of an initially delaminated composite sandwich structure was the experimental analysis on multiple configurations in how the arrestment keys are placed. The first part of this thesis research was to the experimental design and manufacturing of the composite sandwich plates. These plates were later cut down to the specific test dimensions and manufacturing processes for the composite sandwich plates and test specimens were created. The

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44

Davis, Richard Anthony. "The Effects of a Damage Arrestment Device on the Mechanical Behavior of Sandwich Composite Beams Under Four-Point Bending." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/506.

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The demand for an insert on composite sandwich structures to aid in the arrestment of face-core delamination is of great need. This research studies the use of a damage arrestment device (DAD) that connects the carbon fiber face sheets to the foam core to find whether an increase in the structural integrity of the sandwich beam results. Experimental analysis was employed to test the samples and was verified by a theoretical and finite element approach. The mechanical properties of LTM45/CF1803 pre-impregnated carbon fiber and Last-A-foam FR 6710 polyvinylchloride foam were experimentally ana

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45

Sans, Canovas Daniel. "Advances in fibre Bragg grating sensors for damage detection in composite laminates: application in quasi-static and fatigue delamination tests." Doctoral thesis, Universitat de Girona, 2013. http://hdl.handle.net/10803/117357.

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The use of composite materials in industrial applications such as aeronautical, aerospace or wind energy production has greatly increased in recent decades. Due to their inherent properties, these materials allow lighter, larger and more resistant structures. However, the use of composite materials for components or structures with highly stringent requirements, is hampered by the lack of knowledge of their reliability. In this thesis, some fundamental aspects about the use of fibre Bragg grating (FBG) sensors for internal strain measurements in composite laminates are discussed. In addition,

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46

Ligato, Edoardo. "Numerical evaluation of the delamination behaviour in Mixed Mode Bending CFRP specimens." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016.

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The raising interest in composite materials of last decades, justifed by their amazing properties, is pushing to fill the knowledge gap which constraints their employment. Damage behavioural predictions are required to be good enough in order to satisfy the strict aeronautical regulations. The study performed in this thesis work, which is located in the above described framework, aimed to supply informations about crack propagation under mixed-mode loading condition. In particular, critical forces and Strain Energy Release Rates have been determined to describe the behaviour in the range betw

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47

Garrett, Joseph Daniel. "Experimentation of Mode I and Mode II Fracture of Uni-Directional Composites and Finite Element Analysis of Mode I Fracture Using Cohesive Contact." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1670.

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As the use of fiber-reinforced composites has increased over the decades, so has the need to understand the complexity of their failure mechanisms as engineers seek to improve the damage tolerance of composite laminated structures. One of the most prevalent and limiting mode of failure within composite laminates is delamination, since it not only reduces a structures stiffness and strength, but can be very difficult to detect without the use of special non-destructive equipment. Industry testing organizations have utilized several fracture tests in order to characterize the fracture toughness

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48

Dupleix-Couderc, Chloé. "Sur une stratégie multi-échelle d'analyse des grands délaminages en dynamique transitoire." Thesis, Cachan, Ecole normale supérieure, 2011. http://www.theses.fr/2011DENS0013/document.

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Les matériaux composites sont largement utilisés dans les structures aéronautiques. Les travaux présentés ici visent à mettre en place une méthode de calcul permettant de prédire les délaminages dans ces structures stratifiées soumises à des chargements dynamiques tout en assurant des coûts de calculs compatibles dans un contexte industriel. Une méthode de décomposition de domaine en dynamique est d’abord utilisée, afin de coupler des modélisations et des pas de temps de calcul différents. Une modélisation fine est utilisée uniquement dans les zones en cours de dégradation. Une représentation

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49

Kulkarni, Mandar Madhukar. "Prediction of Elastic Properties of a Carbon Nanotube Reinforced Fiber Polymeric Composite Material Using Cohesive Zone Modeling." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1235433423.

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50

Le, Guen-Geffroy Antoine. "Marine ageing and fatigue of carbon/epoxy composite propeller blades." Thesis, Brest, 2019. http://www.theses.fr/2019BRES0104.

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Les travaux présentés portent sur l’étude du vieillissement en milieu marin d’un composite carbone époxy pour applications pâles d’hélice de navires. La caractérisation de la prise en eau dans la résine pure et le composite a montré un comportement Fickien. La présence d’eau dans les porosités du composite a également été mise en évidence analytiquement. Le vieillissement accéléré de la résine a mis en évidence trois phénomènes : l’oxydation, le vieillissement physique et la plastification. L’effet mécanique de ces deux derniers a été particulièrement étudié. La présence d’eau et donc d’une ré

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