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Rozprawy doktorskie na temat „Composite bonded joints”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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1

Ficarra, Christina Helene. "ANALYSIS OF ADHESIVE BONDED FIBER-REINFORCED COMPOSITE JOINTS." NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010626-155040.

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<p>The work presented in this thesis involved the analysis of adhesive bonded joints for composite bridge decks and was divided into three phases. The first phase involved a parametric study on a single lap joint using ANSYS finite element analysis software. The purpose of the parametric study was to alter the geometry and material properties of the joint and study their effects on the stress distribution in both the adherends and adhesive. The four different cases studied included adding a taper to the adherends, different edge shapes on the adhesive layer, a material stiffness imbalance and

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2

ShaÌ„hid, MuhÌ£ammad. "Adhesion characterisation of bonded steel/composite cleavage joints." Thesis, University of Glasgow, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.402470.

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3

Osiyemi, Stephen Olusegun. "The fatigue performance of adhesively bonded fibre-composite joints." Thesis, Imperial College London, 1992. http://hdl.handle.net/10044/1/7971.

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Brett, Michael Alexander de Oliveira. "Prediction of the performance of adhesively-bonded composite joints." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9545.

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The use of adhesively-bonded joints instead of the traditional types of joining can give reduced weight and increased stiffness in a structure. However, most industries have concerns about the use of adhesive joints in anything other than secondary structures, due to uncertainties over the long-term service life. This thesis discusses the prediction of the lifetime of adhesively-bonded composite structures. A fracture mechanics approach was used to characterise the fracture behaviour of an epoxy film adhesive, Cytec FM-300M, mainly using composite substrates prepared using wet peel ply, removi

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5

Pillai, Govind Ramakrishna Lankarani Hamid M. "Response of adhesively bonded composite joints to low velocity impact." Diss., A link to full text of this thesis in SOAR, 2006. http://soar.wichita.edu/dspace/handle/10057/676.

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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.<br>"December 2006." Title from PDF title page (viewed on Nov. 4, 2007). Thesis adviser: Hamid M. Lankarani. Includes bibliographic references (leaves 64-67).

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Mosher, Bryan C. "Failure Prediction of Adhesively Bonded Hardboard Doorskin Joints." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/42867.

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Wood and wood based composites such as hardboard have become very common materials for use in non-structural applications, which include pre-finished paneling, siding, exterior trim, furniture, and door skins. This thesis describes the results of a study of the failure of hardboard door skins. Forces applied during manufacture load the door skins in bending, and in some cases cause a split at the edge of the hardboard. A finite element model as well as a closed form solution based on mechanics of materials were developed to analyze the stresses and deformations of the door skin/stile assemb

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7

Pohlit, David Joseph. "Dynamic Mixed-Mode Fracture of Bonded Composite Joints for Automotive Crashworthiness." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33837.

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An experimental evaluation of the mixed-mode fracture behavior of bonded composite joints is presented. Commonly used experimental techniques for characterizing the mode I, mixed-mode I/II, mode II, and mode III fracture behavior have been employed for the purpose of developing a fracture envelope to be utilized in the automotive design process. These techniques make use of such test geometries as the double cantilever beam (DCB), asymmetric double cantilever beam (ADCB), single-leg bend (SLB), end-loaded split (ELS), and split cantilever beam (SCB) specimens. Symmetric versions of the DCB,

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8

Wang, Xiao. "Stress-Function Variational Methods for Stress Analysis of Composite Laminates and Adhesively Bonded Composite Joints." Thesis, North Dakota State University, 2015. https://hdl.handle.net/10365/27639.

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Adhesively bonded composite joints (ABCJs) have been broadly used to connect multimaterials and show their structural and economic advantages compared to traditional bonding methods. However, robust methods are still desired for efficient and accurate lay-wise stress analysis of ABCJs involving multiple boundaries and layers. The purpose of this work was to extend the stress-function variational method for free-edge stress analysis of composite laminates with a finite length. At each interface of the laminate, two unknown Lehknitskii?s stress potential functions were introduced to interp

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9

Radice, Joshua J. "The analysis and design of adhesively bonded composite structures." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 1.10Mb , 279 p, 2005. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:3181889.

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10

Tiu, W. P. "Fatigue strength prediction of adhesively bonded unidirectional carbon fibre reinforced composite joints." Thesis, City University London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378857.

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11

Jolly, Prateek. "Lamb wave based active damage identification in adhesively bonded composite lap joints." Thesis, Mississippi State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10100288.

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<p> Bonding composite structures using adhesives offers several advantages over mechanical fastening such as better flow stress, weight saving, improved fatigue resistance and the ability to join dissimilar structures. The hesitation to adopt adhesively bonded composite joints stems from the lack of knowledge regarding damage initiation and propagation mechanisms within the joint. A means of overcoming this hesitation is to continuously monitor damage in the joint. This study proposes a methodology to conduct structural health monitoring (SHM) of an adhesively bonded composite lap joint using

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12

Flor, Felipe Rendeiro. "Damage monitoring in composite structures via vibration based method: metal-composite bonded joints and sandwich structures." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-04042016-161659/.

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The present document covers the studies over Structural Health Monitoring systems via vibration based methods. The topic is organized in two parallel studies. The first one analyzes the integrity of metal-composite single lap bonded joints. The second one approaches similar analyses for sandwich structures. The monitoring was made by investigating the dynamic response both computationally and experimentally to verify the reliability of applying vibration based SHM procedures, specifically with the objective of identifying the presence of debonding damage. The dynamic responses were obtained vi

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13

Lubke, Kathleen A. "Investigation of cold temperature and environmental effects of adhesively bonded joints." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20016.

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Owens, James F. P. "Studies on stiffness and fracture behaviour in adhesively bonded composite-to-metal shear joints." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0013/MQ35515.pdf.

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Capell, Tobias F. "Applications of embedded chirped fibre Bragg grating sensors for damage and defect detection in composites and composite bonded joints." Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580337.

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This thesis reports investigations into the application of a type of optical sensor to detect and monitor damage in composites structures. The chirped fibre Bragg grating (CFBG) is a type of optical component that is sensitive to both strain and temperature and is commonly found in the telecommunications industry as a filter. Its small diameter and low cost makes it a potentially inexpensive sensor ideal for embedding in composite materials. This work consisted of extending the use of CFBG sensors into three areas: monitoring of disbonding in composite-metal bonded joints; detection of manufac

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16

Makhecha, Dhaval Pravin. "Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models." Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29631.

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Using experimental data obtained from standard fracture test configurations, theoretical and numerical tools are developed to mathematically describe non-self-similar progression of cracks without specifying an initial crack. A cohesive-decohesive zone model, similar to the cohesive zone model known in the fracture mechanics literature as the Dugdale-Barenblatt model, is adopted to represent the degradation of the material ahead of the crack tip. This model unifies strength-based crack initiation and fracture-mechanics-based crack progression. The cohesive-decohesive zone model is implemente

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17

Musaramthota, Vishal. "Prediction of Fracture Toughness and Durability of Adhesively Bonded Composite Joints with Undesirable Bonding Conditions." FIU Digital Commons, 2015. http://digitalcommons.fiu.edu/etd/2513.

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Advanced composite materials have enabled the conventional aircraft structures to reduce weight, improve fuel efficiency and offer superior mechanical properties. In the past, materials such as aluminum, steel or titanium have been used to manufacture aircraft structures for support of heavy loads. Within the last decade or so, demand for advanced composite materials have been emerging that offer significant advantages over the traditional metallic materials. Of particular interest in the recent years, there has been an upsurge in scientific significance in the usage of adhesively bonded compo

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18

Chadegani, Alireza. "Strain energy release rate analysis of adhesive-bonded composite joints with a prescribed interlaminar crack." Thesis, Wichita State University, 2008. http://hdl.handle.net/10057/2023.

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Composite materials together with adhesive-bonding have been increasingly used in the aviation industry. Delamination is among the critical failure modes in fiber-reinforced laminated composite structures including adhesive-bonded assemblies. This thesis presents an analytical approach by taking into account the first-ply failure in adhesive-bonded composite joints subjected to axial tension. The ASTM D3165 standard test specimen geometry is followed for model development derivations. The field equations, in terms of displacements within the joint, are formulated by using the first-order, shea

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19

Chadegani, Alireza Yang Charles. "Strain energy release rate analysis of adhesive-bonded composite joints with a prescribed interlaminar crack." A link to full text of this thesis in SOAR, 2008. http://hdl.handle.net/10057/2023.

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20

Palaniappan, Jayanthi. "The use of a CFBG sensor for detecting damage in composite laminates and adhesively bonded joints." Thesis, University of Surrey, 2008. http://epubs.surrey.ac.uk/940/.

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Reliable in-situ damage detection techniques which can detennine the existence and location of damage in composite materials and structures are critical for the effective use of these materials. In this work, embedded chirped fibre Bragg grating (CFBG) sensors have been shown to be successful for both detection and location of matrix cracks in composite laminates and disbond detection in bonded composite joints. In all the cases, the CFBG reflection spectra were predicted using commercial software and agreed well with the experimental results. In the matrix cracking work, single matrix cracks

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21

Khan, Minhaj A. "Development of rules for the design of adhesively bonded fibre-reinforced plastic composite joints in aerospace applications." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/848672/.

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This thesis describes progression towards developing an enhanced design methodology for laminated composite bonded joints in aerospace applications. The premise of a universal failure criterion is impractical given the number of adhesive-adherend configurations available. However, for a finite number of joint configurations, design rules can be developed based on experimental test data and detailed finite element modelling. By using these techniques rather than the traditional, overly conservative knock-down factors, more of the performance of composite bonded joints can be accessed. While com

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22

Abdel, Monsef Said Ahmed Ibrahim. "A comprehensive methodology to analyse bonded joints subjected to different environmental conditions." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/669651.

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Cohesive zone models are widely used for modelling delamination and bonded joints under different loading conditions. In the current thesis, an objective inverse method has been developed to extract the cohesive law from experimental load-displacement data for both mode I and mode II. In addition, the influence of the mode II test configuration on the cohesive law of bonded joints is discussed. Besides, the influence of environmental conditions on the fracture behaviour of two types of adhesively bonded joints is experimentally studied for Mode I and Mode II tests. The dependence of the cohesi

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23

Simon, Pavel. "Progresivní styčníky FRP kompozitů konstrukcí dopravní infrastruktury." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390279.

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This thesis deals with junction points of construction used in transport infrastructure, which are made of FRP composite material. Main focus is on bonded joints. The material and geometrical criteria od FRP material and there influence to junctions are analyzed. In sequential steps the development of the design of joints applicable to reference constructions - pedestrian walkways is documented. There are also presented practical experiences from the tests of joints of overlapped and single-sided joints, as well as experience from the design, production and testing of two types of pedestrian b

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Roy, Samit. "A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/88624.

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A two-dimensional finite-element computational procedure is developed for the accurate analysis of the strains and stresses in adhesively bonded joints. The large displacements and rotations experienced by the adherends and the adhesive are taken into account by invoking the updated Lagrangian description of motion. The adhesive layer is modeled using Schapery's nonlinear single integral constitutive law for uniaxial and multiaxial states of stress. Effect of temperature and stress level on the viscoelastic response is taken into account by a nonlinear shift factor definition. Penetrant sorpti

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25

Crammond, G. "Development of optical techniques for the experimental analysis of local stress and strain distributions in adhesively bonded composite joints." Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/355981/.

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This research seeks to evaluate the local stress and strain distributions formed in adhesively bonded composite joints under quasi static and high strain rate loading. A literature review of current analytical, numerical and experimental studies of adhesively bonded joints is presented and identifies the lack of knowledge in the behaviour of composite bonded joints in the through-thickness direction. Detailed analysis of the stress and strain in the joint, and their impact on the development of damage prior to and during failure have been obtained using Digital Image Correlation (DIC). An expe

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26

Wong, King Jye. "Moisture absorption characteristics and effects on mechanical behaviour of carbon/epoxy composite : application to bonded patch repairs of composite structures." Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00949293.

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Le travail présenté dans ce mémoire avait pour objectif d'étudier le processus de la pénétration d'eau dans les composites en carbone/époxyde dans un premier temps, et dans un deuxième temps, d'étudier l'effet de la prise en eau par ces matériaux sur les performances mécaniques des composites et leur joints collés. L'intégration de ces phénomènes physiques dans la modélisation numérique est d'une grande importance dans la prédiction de la durabilité d'une structure en composite subissant un vieillissement hygrothermique. Par conséquent, ce travail consiste non seulement en des observations exp

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Pérez, Galmés Magdalena. "Analysis and development of experimental characterization methodologies of mode II fracture toughness on CFRP bonded joints." Doctoral thesis, Universitat de Girona, 2018. http://hdl.handle.net/10803/664508.

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Adhesives have been shown to be an excellent solution for joining fibre reinforced polymer (FRP) components thanks to their capacity to redistribute loads, reduces stress concentrations and contribute to overall weight saving in the structure. The most relevant mechanical property in adhesive bonded joints design is the shear (mode II) fracture toughness of the adhesive. The application of the existing mode II delamination standards to adhesive joints entails some major limitations that result in severe under/over estimations of the adhesive properties and, in many cases, can even prevent r

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Nicoli, Edoardo. "Characterization of Mixed-Mode Fracture Testing of Adhesively Bonded Wood Specimens." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28372.

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The primary focus of this thesis was to investigate the critical strain energy release rates (G) for mixed-mode (I/II) fracture of wood adhesive joints. The aims of the study were: (1) quantifying the fracture properties of two material systems, (2) analyzing the aspects that influence the fracture properties of bonded wood, (3) refining test procedures that particularly address layered orthotropic systems in which the layers are not parallel to the laminate faces, of which wood is often a particular case, and (4) developing testing methods that enhance the usefulness of performing mixed-mode

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Carraro, Paolo Andrea. "Multiaxial fatigue behaviour of composite materials: characterisation and modelling." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423782.

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Thanks to their lightness and versatility combined with excellent mechanical properties, composite materials underwent an increasing relevance in the last twenty years in many industrial fields, also for structural applications. This class of materials offer a wide range of advantages but it is still characterized by a quite high cost with respect to more traditional structural materials. One of the reasons is the lack of reliable design procedures, as well as of extensive experimental investigations in the literature providing clear and general information. This is particularly evident wi

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Elder, David James, and d. elder@crc-acs com au. "Optimisation of parametric equations for shock transmission through surface ships from underwater explosions." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080212.105012.

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Currently shock effects on surface ships can be determined by full scale shock trials, Finite Element Analysis or semi empirical methods that reduce the analytical problem to a limited number of degrees of freedom and include hull configurations, construction methods and materials in an empirical way to determine any debilitating effects that an explosion may have on the ship. This research has been undertaken to better understand the effect of hull shape on surface ships' shock response to external underwater explosions (UNDEX). The study is within the semi empirical method category of comput

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Budhe, Sandip Rudha. "Effect of pre-bond moisture on the static and fatigue behaviour of bonded joints between CFRP laminates for structural repairs." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/283567.

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In recent years, the use of composite materials in the aeronautic, automotive, marine construction, etc. has increased significantly. Hence, there is an increasing need for repair technologies on primary structural components, as replacing a damaged component by a new one is not cost effective in many cases. The composite structures experience damage in service that comes from accidental impacts, mechanical stresses, environmental factors (moisture and temperature), etc. Thus, maintenance and repair is the concern of the end users as well as of the manufacturers. Suitable material systems and

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Houhou, Noureddine. "Durabilité des interfaces collées béton/renforts composites : développement d'une méthodologie d'étude basée sur un dispositif de fluage innovant conçu pour être couplé à un vieillissement hygrothermique." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00765147.

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Le programme de recherche développé dans le cadre de cette thèse a pour principal objectif de concevoir, réaliser et valider une méthodologie d'étude des effets du vieillissement des interfaces collées, basée sur l'utilisation d'un dispositif de fluage innovant pouvant être couplé à un vieillissement hygrothermique. Celui-ci reprend la configuration classique de joint à double recouvrement mais permet de solliciter sous charge constante l'assemblage collé béton/composite. Il présente de plus certaines spécificités (zones de joint non sollicitées, compatibilité avec une machine d'essai à simple

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Madureira, Fernando. "Fabricação e controle de espessura de juntas coladas single lap joint: caracterização mecânica dos aderentes e do adesivo." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-10122018-205044/.

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Devido a suas vantagens comparadas aos métodos tradicionais de união mecânica, a utilização de juntas coladas estruturais só tende a crescer, entretanto, devido suas propriedades e modos de falha dependerem de diversos parâmetros (tratamento superficial, geometria, material, condições de tralho, etc.) uma utilização mais ampla desta técnica ainda é restrita pela ausência de modelos de falhas confiáveis. O presente trabalho consiste na apresentação de métodos para fabricação de juntas coladas em material compósito e verificação da influência da espessura da camada adesiva na resistência de junt

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34

White, Caleb, and caleb white@rmit edu au. "Health Monitoring of Bonded Composite Aerospace Structures." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2009. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090602.142122.

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Airframe assemblers have long recognised that for a new aircraft to be successful it must use less fuel, have lower maintenance requirements, and be more affordable. One common tactic is the use of innovative materials, such as advanced composites. Composite materials are suited to structural connection by adhesive bonding, which minimises the need for inefficient mechanical fastening. The aim of this PhD project was to investigate the application of existing, yet immature Structural Health Monitoring (SHM) techniques to adhesively bonded composite aerospace structures. The PhD study focu

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Ribeiro, Marcelo Leite. "Programa para análise de juntas coladas: compósito/compósito e metal/compósito." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-19012011-122529/.

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O presente trabalho consiste basicamente no desenvolvimento de um programa de engenharia denominado SAJ (sistema de análise de juntas) capaz de realizar uma análise detalhada do comportamento de dois dos diversos tipos de juntas coladas existentes, a junta simples colada (\"single lap joint\") e a junta dupla colada (\"double lap joint\"). Sendo que foram analisadas juntas coladas com aderentes de material compósito ou, então, compostas de aderentes de compósitos e metal. O programa de engenharia desenvolvido possibilita o cálculo das tensões, dos esforços e dos deslocamentos nessas juntas. Pa

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Bhamare, Vinay Vasant Lankarani Hamid M. "Transverse impact characteristics of adhesively bonded composite single lap joint." Diss., Click here for available full-text of this thesis, 2006. http://library.wichita.edu/digitallibrary/etd/2006/t080.pdf.

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Thesis (M.S.)--Wichita State University, College of Engineering.<br>"May 2006." Title from PDF title page (viewed on October 29, 2006). Thesis adviser: Hamid M. Lankarani. Includes bibliographic references (leaves 62-64).

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Melcher, Ryan James. "Characterization of polymer matrix composites and adhesively bonded joints in a cryotank environment." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16035.

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Sarr, Cheikh Ahmed Tidiane. "Vers une auscultation par acousto-ultrasons des renforcements par composites collés de structures du génie civil." Thesis, Ecole centrale de Nantes, 2022. http://www.theses.fr/2022ECDN0005.

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Un rapport sénatorial de Juin 2019 estime le parc d’ouvrages vieillissants de la France à plus de 25000 ponts routiers. Une des solutions préconisées pour éviter la ruine de ces structures est leur renforcement par collage de matériaux composites. Cette solution technique permet d’augmenter la durée de vie des ouvrages tout en prenant en compte de nouvelles sollicitations (augmentation drastique du trafic et risques sismiques). Cependant, elle est efficace que lorsque le joint de colle est bien exécuté et exempt de tout défaut ou endommagement. Ainsi, son utilisation est limitée par une méconn

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Choudhry, Rizwan Saeed. "Characterisation and modelling of impact damage in bonded joints of woven fibre polymeric composites." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.498781.

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Bonded joints are key structural elements and for parts made from fibre reinforced polymeric matrix composites (FRC), these are preferred over mechanical fasteners such as rivets and bolts. Low velocity impact loading of structures is frequently encountered both in-service and during maintenance and when an object made from FRC is subjected to impact loading, the resulting damage is often quite complex in terms of both multiplicity and unpredictability of damage modes. If the structure involves bonded joints the complexity is increased further. Since the use of composite materials is continuou

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Kaymak, Yalcin. "A Composite Frame/joint Super Element For Structures Strengthened By Externally Bonded Steel/frp Plates." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1052547/index.pdf.

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A materially non-linear layered beam super element is developed for the analysis of RC beams and columns strengthened by externally bonded steel/FRP plates. The elasto-plastic behavior of RC member is incorporated by its internally generated or externally supplied moment-curvature diagram. The steel plate is assumed to be elasto-plastic and the FRP laminate is assumed to behave linearly elastic up to rupture. The thin epoxy layer between the RC member and the externally bonded lamina is simulated by a special interface element which allows for the changing failure modes from steel plate yieldi

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Simon, Joshua Cameron. "Response and Failure of Adhesively Bonded Automotive Composite Structures under Impact Loads." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/34881.

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An experimental technique for conducting low speed impact of adhesively bonded automotive composite joints is presented. Based on the use of a modified drop tower, mode I, II, and mixed mode values for critical energy release rate were determined for a composite/epoxy system and used to create a fracture failure envelope. Because load measurements become erratic and unreliable at higher test rates, displacement-based relationships were used to quantify these energy release rates. Displacement data was collected with an imaging system that utilized edge detection to determine displacement pr

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Grasso, Paolo. "Numerical simulations of the effects of residual stresses in adhesively bonded composite specimen." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10268/.

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In this work the problem of performing a numerical simulation of quasi-static crack propagation within an adhesive layer of a bonded joint under Mode I loading affected by stress field changes due to thermal-chemical shrinkage induced by cure process is addressed. Secondly, a parametric study on fracture critical energy, cohesive strength and Young's modulus is performed. Finally, a particular case of adhesive layer stiffening is simulated in order to verify qualitatively the major effect.

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Chowdhury, Uraching. "Theoretical and Computational Studies of the Mechanical Strength and Fracture Toughness of Adhesively Bonded Joints and Polymer Nanoclay Composites." Thesis, North Dakota State University, 2019. https://hdl.handle.net/10365/29274.

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Increasing use of adhesively bonded joints (ABJs) and polymer nanoclay composites (PNCs) in modern vehicles and other industrial sectors has deeply shaped the design and manufacturing of advanced materials and structures for better mechanical stiffness, durability, and fracture toughness. (1) A nonlinear fracture model is formulated for accurately extracting the fracture toughness of ABJs with large plastic deformations and springback and further validated by ABJ fracture data available in the literature. (2) Cohesive zone model (CZM) is integrated into finite element method (FEM) to simulate

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McGee, Caleb. "NUMERICAL EVALUATION OF ADHESIVE JOINTS IN COMPOSITE STRUCTURES USING FEA." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1743.

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The increasing use of composite materials in many industries such as aerospace, automotive, and civil industries has increased the need for the development of effective techniques to detect defects in the bondlines of adhesive joints in composite structures. Currently, composite structures used in commercial applications such as modern aircraft use mechanical fasteners in redundancy to adhesive bonds to ensure structural integrity due to a lack of methods to reliably detect defects in the bondline of composite structure. As such, this thesis facilitates the development of nondestructive eval

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Liddel, Paul Daniel. "Transforming composite design by use of structural health monitoring." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/12380.

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Commercial composite aerospace structure is required to be designed and managed under the damage tolerant principle. Airworthiness is maintained through a process of regulated inspections and if required maintenance. Currently inspections use visual and assisted visual (non-destructive inspection - NDI) techniques. Damage tolerant operation is therefore reliant on inspectability. Unlike metal structure composite and adhesively bonded structure may show few if any recognisable indicators prior to rapid failure, either visually or using NDI. Although stringent manufacturing processes are demande

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Caggegi, Carmelo. "Experimental analysis of the efficiency of carbon fiber anchors applied over CFRP to firebrick bonded joints." Doctoral thesis, Università di Catania, 2013. http://hdl.handle.net/10761/1410.

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In these recent years, the strengthening of masonry building has known a massive use of CFRP sheets. Those composite materials glued on the elements to reinforce are exposed to prematurely debonding crisis due to a tension load which is much smaller than the tensile strength of the CFRP. A way to upgrade failure load of CFRP-to-support bonded joint is to reinforce the cohesion between the fibers and the support by the use of mechanicals anchors built with the same fibers of the composite and fastened in the support like nails . Research on the use of anchors for masonry supports has been limi

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Caggegi, Carmelo. "Experimental analysis of the efficiency of carbon fiber anchors applied over CFRP to firebrick bonded joints." Thesis, Paris Est, 2013. http://www.theses.fr/2013PEST1025/document.

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Dans les dernières années, le renforcement des bâtiments en maçonnerie a connu une usure massive des bandes CFRP. Ces matériaux composites, attachés sur les éléments à renforcer, sont exposés à une fracture prématurée pour délaminage (...). Une façon pour accroître la résistance maximale du système renforcé par CFRP est d'améliorer la cohésion entre support et composite en utilisant des ancrages mécaniques. Ces derniers sont réalisés en utilisant les mêmes typologies de fibres de renforcement et en les insérant dans le support comme des «clous». Les recherches scientifiques sur l'usure de cett

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Guvendik, Ozen. "&quot." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605523/index.pdf.

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In this Thesis, the problems of the Free Flexural (or Bending) Vibrations of Composite, Orthotropic Plates and/or Panels with Various Bonded Joints are formulated and investigated in detail. The composite bonded plate system is composed of Plate Adherends adhesively bonded by relatively very thin adhesive layers. The general problem is considered in terms of the three Main PROBLEMS, namely Main PROBLEM I, Main PROBLEM II and Main PROBLEM III. The theoretical formulation of the Main PROBLEMS is based on Mindlin Plate Theory which is a First Order Shear Deformation Plate Theory (FSDPT). Thus, th

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Sagnard, Maxime. "Detection of Weak Bonds in Bond ed CFRP Assemblies using Symmetrical LAser Shock Adhesion Test (S-LASAT)." Thesis, Paris, ENSAM, 2019. http://www.theses.fr/2019ENAM0022.

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L’une des grandes problématiques actuelles des secteurs aéronautique et spatial est la réduction du taux d’émission de CO2. Une des solutions est l’allègement et l’optimisation des structures. Dans cette optique, certains avions comme l’a380 ou l’a350 XWB ont été fabriqués en grande partie à l’aide de matériaux composites. Plus résistants et plus légers, ils permettent un gain de poids important comparés aux matériaux métalliques. Cependant, ces pièces composites sont encore assemblées à l’aide de rivets ou de boulons. Ces procédés non adaptés aux matériaux composites limitent le gain de poids

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Dobiáš, Jiří. "Studium adheze lepených balistických kompozitů v závislosti na použitých materiálech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-376803.

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The aim of this work was to investigate the properties of bonded ballistic materialsBalistic composites are mainly glued to reduce weight while keeping their protective properties. On this basis, the materials used were ballistic steel, ceramics, rubber kevlar, non-gummed kevlar, Dyneema and fiberglass. For bonding used were a one-component adhesive Collano 36.104 and two-component adhesive Biresin U1305. The strength of the joint was measured in shear at tensile loads. From these results, deformation energy was further calculated.

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