Effects of Environmental Ageing Parameters on Interfacial Bond Properties of Carbon Fiber Tow in Epoxy Resin PDF Download
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Author: Shloka Vemuganti
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 98
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Book Description
The effects of environment on the interfacial bond strength of carbon fiber tow embedded in epoxy resin are being studied through accelerated aging experiments and pull-out tests (PT). The goal is to examine the synergistic effects of hot, cold, wet, dry and stressed environment on interfacial bond strength (IFBS) of carbon/epoxy composites in order to forecast life of composites in severe environments. The PT specimens were prepared by embedding a fixed length of a carbon fiber tow in uncured epoxy. The interfacial debonding between resin and fiber tow is the targeted mode of failure. A spring loaded frame was designed for applying a preset load to multiple PT specimens. All the PT specimens including the frames with the stressed specimens were subjected to accelerated environmental aging conditions for different time intervals. The moisture absorption and desorption data were recorded. The PT tests were then carried out by pulling the carbon fiber tow from the cylindrical resin, mounted in a screw driven MTS testing machine. Average IFBS of approximately 21.5 MPa was observed for the unaged control sample. The hot/wet/stressed (70°C/3% moisture/2 lb) specimens show a significant degradation ( -29.03 %) in bond strength after 176 days of aging time. The degradation due to moisture is seen to be more critical under the influence of temperatures (50°C, 70°C). In order to obtain the maximum interfacial shear strength for various embedded lengths and environmental aging parameters, a numerical analysis has been carried out using a 3D finite element model (FEM). A FEM analysis was done using cohesive elements at the fiber/matrix interface in order to study the environmental aging effects at the interface. The predicted bond strength from the numerical analysis was compared with the experimental data. A reasonable agreement was observed between experimental data and Finite Element Analysis (FEA).
Author: Shloka Vemuganti
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 98
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Book Description
The effects of environment on the interfacial bond strength of carbon fiber tow embedded in epoxy resin are being studied through accelerated aging experiments and pull-out tests (PT). The goal is to examine the synergistic effects of hot, cold, wet, dry and stressed environment on interfacial bond strength (IFBS) of carbon/epoxy composites in order to forecast life of composites in severe environments. The PT specimens were prepared by embedding a fixed length of a carbon fiber tow in uncured epoxy. The interfacial debonding between resin and fiber tow is the targeted mode of failure. A spring loaded frame was designed for applying a preset load to multiple PT specimens. All the PT specimens including the frames with the stressed specimens were subjected to accelerated environmental aging conditions for different time intervals. The moisture absorption and desorption data were recorded. The PT tests were then carried out by pulling the carbon fiber tow from the cylindrical resin, mounted in a screw driven MTS testing machine. Average IFBS of approximately 21.5 MPa was observed for the unaged control sample. The hot/wet/stressed (70°C/3% moisture/2 lb) specimens show a significant degradation ( -29.03 %) in bond strength after 176 days of aging time. The degradation due to moisture is seen to be more critical under the influence of temperatures (50°C, 70°C). In order to obtain the maximum interfacial shear strength for various embedded lengths and environmental aging parameters, a numerical analysis has been carried out using a 3D finite element model (FEM). A FEM analysis was done using cohesive elements at the fiber/matrix interface in order to study the environmental aging effects at the interface. The predicted bond strength from the numerical analysis was compared with the experimental data. A reasonable agreement was observed between experimental data and Finite Element Analysis (FEA).
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 694
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Book Description
Author: Paul E. McMahon
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 180
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Book Description
Author: Rod Martin
Publisher: Elsevier
ISBN: 1845694937
Category : Technology & Engineering
Languages : en
Pages : 543
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Book Description
Ageing of composites is a highly topical subject given the increasing use of composites in structural applications in many industries. Ageing of composites addresses many of the uncertainties about the long-term performance of composites and how they age under conditions encountered in service.The first part of the book reviews processes and modelling of composite ageing including physical and chemical ageing of polymeric composites, ageing of glass-ceramic matrix composites, chemical ageing mechanisms, stress corrosion cracking, thermo-oxidative ageing, spectroscopy of ageing composites, modelling physical and accelerated ageing and ageing of silicon carbide composites. Part two examines ageing of composites in transport applications including aircraft, vehicles and ships. Part three reviews ageing of composites in non-transport applications such as implants in medical devices, oil and gas refining, construction, chemical processing and underwater applications.With its distinguished editor and international team of contributors, Ageing of composites is a valuable reference guide for composite manufacturers and developers. It also serves as a source of information for material scientists, designers and engineers in industries that use composites, including transport, chemical processing and medical engineering. - Addresses many of the uncertainties about the long-term performance of composites and how they age under conditions encountered in service - Reviews processes and modelling of composite ageing including chemical ageing mechanisms and stress corrosion cracking - Discusses ageing of composites in both transport and non-transport applications ranging from aircraft to implants in medical devices
Author: Venkatesh Rao
Publisher:
ISBN:
Category : Carbon composites
Languages : en
Pages : 410
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Book Description
Author: Paul E. McMahon
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 184
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Book Description
Author: ESW Kong
Publisher:
ISBN:
Category : Epoxy composites
Languages : en
Pages : 4
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Book Description
Matrix-dominated physical properties of a carbon-fiber-reinforced epoxy composite and a neat epoxy resin have been found to be affected by annealing in nitrogen below the glass transition temperature Tg. Postcured (±45)2s specimens of Thornel 300 carbon-fiber/Fiberite 934 epoxy as well as neat Fiberite 934 epoxy resin were quenched from above Tg and given a sub-Tg annealing at 140°C for times up to 105 min. The damping behavior, stress-relaxation rate, and the enthalpic state of the matrix material were found to decrease as functions of annealing time. No weight loss was observed during annealing. The time-dependent change in physical properties is explained on the basis of free-volume collapse that is related to the physical aging of the nonequilibrium glassy network of epoxy. Physical aging in network epoxy has been demonstrated to be a thermoreversible process. The kinetics of this aging process were monitored by differential scanning calorimetry, stress-relaxation tests, and dynamic mechanical analysis.
Author:
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 638
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722792565
Category :
Languages : en
Pages : 76
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Book Description
The adhesion strength of AS4 fibers to thermoplastic polymers was determined. The specific polymers were polycarbonate, polyphenylene oxide, polyetherimide, polyphenylene oxide blends with polystyrene, and polycarbonate blends with a polycarbonate-polysiloxan copolymer. Data are also included for polysulfone. It was recognized at the outset that an absolute measure of the fiber matrix adhesion would be difficult. However, it is feasible to determine the fiber bond strengths to the thermoplastics relative to the bond strengths of the same fibers to epoxy polymers. It was anticipated, and in fact realized, that the adhesion of AS4 to the thermoplastic polymers was relatively low. Therefore, further objectives of the study were to identify means of increasing fiber/matrix adhesion and to try to determine why the adhesion of AS4 to thermoplastics is significantly less than to epoxy polymers. Bascom, Willard D. Unspecified Center...
Author: Hüther, Jonas Johannes
Publisher: KIT Scientific Publishing
ISBN: 3731509830
Category : Technology & Engineering
Languages : en
Pages : 360
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Book Description
