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Sunday, May 10, 2020 | History

2 edition of study of the viscoelastic creep behaviour of graphite/epoxy laminates found in the catalog.

study of the viscoelastic creep behaviour of graphite/epoxy laminates

James Douglas Lowe

study of the viscoelastic creep behaviour of graphite/epoxy laminates

by James Douglas Lowe

  • 266 Want to read
  • 21 Currently reading

Published by Division of Engineering Science, Faculty of Applied Science and Engineering, University of Toronto in [Toronto] .
Written in English

    Subjects:
  • Viscoelasticity.,
  • Composite materials -- Creep.,
  • Laminated materials -- Deterioration.

  • Edition Notes

    StatementJames Douglas Lowe.
    Classifications
    LC ClassificationsM267 .Thesis
    The Physical Object
    Pagination1 v. (various foliations) :
    ID Numbers
    Open LibraryOL19552943M

    The linear viscoelastic creep behaviour of FM glass-fibre epoxy, as used in heated GLARE laminates, has been tested and modelled in master curves using both time–ageing time and TTS. Although the metal layers and glass-fibres in GLARE will minimise the effect of creep, shear and interlaminar shear modes can still cause creep behaviour in. Alice Courtois, Martin Hirsekorn, Maria Benavente, Agathe Jaillon, Lionel Marcin, Edu Ruiz and Martin Lévesque, Viscoelastic behavior of an epoxy resin during cure below the glass transition temperature: Characterization and modeling, Journal of Composite Materials, /, 53, 2, (), ().

    This study aims to quantify the effect of physical aging progression on viscoelastic property in carbon/epoxy composites. Understanding viscoelastic behavior of carbon fiber reinforced plastics (CFRPs) has become an essential issue for further application of CFRPs to aerospace structures, which require high dimensional accuracy. Motivations for study Transient properties: creep and relaxation Viscoelastic functions J(t), E(t) Solids and liquids; anelastic materials Dynamic response to sinusoidal load Demonstration of viscoelastic behavior Historical aspects Summary Examples Problems 2 Constitutive relations Introduction.

    In this study, 3-D braided PEEK/AS4 graphite composites were performed and processed to investigate the viscoelastic behavior of this new system. These manufactured composites were characterized to determine their fiber volume fractions and matrix crystallinity indices using matrix digestion and wide angle x-ray diffraction. The convolution theorem of Laplace transformation is applied to circumvent the complexity of dealing with linear viscoelastic materials. The present EFSDT with the Laplace domain approach has the same computational advantage of the conventional FSDT while improving upon the accuracy of the viscoelastic response by utilizing the postprocess.


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Study of the viscoelastic creep behaviour of graphite/epoxy laminates by James Douglas Lowe Download PDF EPUB FB2

An accelerated characterization method for resin matrix composites is reviewed. Methods for determining compliance master curves are given.

Creep rupture analytical models are discussed as applied to polymer-matrix composites. Comparisons between creep and rupture experiments and phenomenological models are by: 9. InZandiatashbar et al published a study, where the creep behaviour was analysed on an epoxy system enhanced by GNPs.

20 The effect of different graphene platelets (GNPs) content (,and wt%), stress magnitude (20 and 40 MPa), and temperature (23°C, 40°C, and 55°C) on the creep behaviour was investigated. 20 At room. The temperature dependences of the creep compliance of the composite laminates and the pure resin are plotted in Fig.

Although on different ordinate scales, the Viscoelastic behaviour of a thermoplastic resin composite ~. ~1 I -~.o0 ' 'Cited by: EXPERIMENTAL CHARACTERIZATION OF THE VISCOELASTIC BEHAVIOR OF A CURING EPOXY MATRIX COMPOSITE FROM PRE-GELATION TO FULL CURE by RYAN J.

THORPE (Integrated Engineering), University of British Columbia, A THESIS SUBMITTED IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE STUDIES Cited by: 2.

In this study, an accelerated viscoelastic characterization scheme is applied to T3OO/52O8 graphite-epoxy laminates. The viscoelastic response of unidirectional specimens.

The effect of viscoelasticity of epoxy adhesive on creep behavior in the adhesive layer of a double-lap joint is studied in this paper. The joint is comprised of three elastic single isotropic adherend layers joined by an epoxy adhesive that is under shear loading.

Prony series is used to modeling the relaxation modulus of epoxy adhesive. A viscoelastic response scheme for the accelerated characterization of polymer-based composite laminates in applied to T/ graphite/epoxy. The response of uni-directional specimens. Viscoelastic or viscoplastic behavior of a material shows itself in various ways, such as creep under constant load, time-dependent recovery of deformation followed by load removal, stress relaxation under constant deformation, and time-dependent creep rupture.

behaviour of graphite/epoxy laminates for R =0;1 and 1. They concluded that a significant life reduction occurs for both R = 1 and R = 1, being higher for R = 1. Rotem and Nelson [7] studied the fatigue behaviour of graphite/epoxy laminates and showed that tension–compression fatigue was more important than ten.

Further, examination of the creep response of polycarbonate (Brinson ) as discussed in Chap. 11 indicates nonlinear behavior for strains larger than about 3 % and the material begins to neck or yield (Luder’s bands form) for strains larger than about 5 %. Obviously, polycarbonate as well as other polymers with similar behavior cannot be considered to be linear for such circumstances.

Viscoelastic Properties of an Epoxy Resin during Cure DANIEL J. O’BRIEN1 Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign Urbana, IL PATRICK T. MATHER Institute of Materials Science University of Connecticut Storrs, CT SCOTT R.

WHITE Department of Aeronautical and Astronautical Engineering. composites [5]. Tuttle and Brinson [6] conducted creep-recovery test for off-axis graphite (T)/epoxy () composites; the nonlinear viscoelastic behaviour is considered to analysis of graphite/epoxy laminates subjected to the in-plane loading, using classical laminated plate theory (CLPT).

The current work is focused on the experimental data required for the viscoelastic characterization of a composite material. Similar work has been conducted on different types of composite materials by Tuttle and Brinson [1] who verified for a carbon epoxy laminate the possibility of long term predicament of creep.

In this study, an accelerated viscoelastic characterization scheme is applied to T/ graphite-epoxy laminates. The viscoelastic response of unidirectional specimens is modeled using the theory developed by Schapery.

The transient component of the viscoelastic creep compliance is assumed to follow a power law approximation. A recursive relationship is developed. Three major topics were pursued. The two-dimensional fintie element micromechanics analysis was extended to include nonlinear viscoelastic material response.

Analytical predictions of the time-dependent behavior or both glassepoxy and graphiteepoxy unidirectinal composites subjected to transverse compression were then correlated with experimental data also generated as part of this study.

Original article Creep and dynamic viscoelastic behavior of endodontic fiber-reinforced composite posts D. Papadogiannis DDS, MSc, PhDa,*, R.S. Lakes BDb, G.

Palaghias DDSc, Y. Papadogiannis DDSc a Department of Biomaterials, School of Dentistry, University of Athens, Greece bDepartment of Engineering Physics, Engineering Mechanics Program and Department of Biomedical Engineering.

Therefore, this Special Issue of Polymers invites the submission of contributions that address topics related with the viscoelastic behavior of polymer–matrix composites.

In this context, any original experimental or simulation work as well as review papers about the strain rate effects, stress relaxation, and/or creep behavior on polymer.

The tensile stress-strain behavior of a variety of graphite/epoxy laminates was examined. Longitudinal and transverse specimens from eleven different layups were monotonically loaded in tension to failure. Ultimate strength, ultimate strain, and stress-strain curves were obtained from four replicate tests in each.

As a consequence, many studies have been conducted and published on accelerated test methods that are used to characterize the viscoelastic behavior of PMCs (Gates et al. ; Goertzen and Kessler ; Barbero ). Accelerated methods use momentary creep-recovery data and models to predict the long-term behavior of the material.

A micromechanical approach is adopted to study the role of viscoelasticity on the fatigue behavior of polymer matrix composites. In particular, the study examines the interaction of fatigue and creep in angle ply carbon/epoxy at 25 and °C. The matrix phase is modeled as a vicoelastic material using Schapery’s single integral constitutive equation.

Taking viscoelsticity into account. Laminated composite plates are widely used in modern structures. Resins of composites are almost made of polymers which show time dependent and and in some cas.The composite parts used in this study are made of graphite/epoxy (AS4/) unidirectional prepregs from Hexcel Composites, which has been used for thermo-viscoelastic analysis during the curing process in previous studies [25,26,27,28,29,30,31,32,33,34,35].

The viscoelastic material properties are listed in Table 1 and Table 2, respectively.The surface modification of carbon nanotubes (CNTs) has been recently observed to influence the distribution of CNTs in epoxy resin and the mechanical properties and electrical conductivities of these CNTs.

Accordingly, the treatment of CNTs to with organic acids to oxidize them generates functional groups on the surface of CNTs. This investigation studies the consequent enhancement of the.