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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723395345
Category :
Languages : en
Pages : 26
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Book Description
The matrix dominated mechanical behavior of a graphite epoxy composite was found to be affected by sub Tg annealing. Postcured + or - 45 deg 4S specimens of Thornel 300 graphite/Narmco 5208 epoxy were quenched from above Tg and given a sub Tg annealing at 140 C for times up to 10 to the 5th power min. The ultimate tensile strength, strain to break, and toughness of the composite material were found to decrease as functions of sub Tg annealing time. No weight loss was observed during the sub Tg annealing. The time dependent change in mechanical behavior is explained on the basis of free volume changes that are related to the physical aging of the nonequilibrium glassy network epoxy. The results imply possible changes in composite properties with service time. Kong, E. S. W. Ames Research Center NASA-TM-81273, A-8495
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723395345
Category :
Languages : en
Pages : 26
Get Book Here
Book Description
The matrix dominated mechanical behavior of a graphite epoxy composite was found to be affected by sub Tg annealing. Postcured + or - 45 deg 4S specimens of Thornel 300 graphite/Narmco 5208 epoxy were quenched from above Tg and given a sub Tg annealing at 140 C for times up to 10 to the 5th power min. The ultimate tensile strength, strain to break, and toughness of the composite material were found to decrease as functions of sub Tg annealing time. No weight loss was observed during the sub Tg annealing. The time dependent change in mechanical behavior is explained on the basis of free volume changes that are related to the physical aging of the nonequilibrium glassy network epoxy. The results imply possible changes in composite properties with service time. Kong, E. S. W. Ames Research Center NASA-TM-81273, A-8495
Author:
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Category :
Languages : en
Pages : 30
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Book Description
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Category :
Languages : en
Pages : 42
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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.
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Category :
Languages : en
Pages :
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Book Description
Author: Ernest G. Wolff
Publisher: DEStech Publications, Inc
ISBN: 9781932078220
Category : Technology & Engineering
Languages : en
Pages : 444
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Book Description
This book is a comprehensive introduction to the quantitative analysis of dimensional instability in composite materials. It will aid in predicting deformations in a wide range of composite materials products and parts, under mechanical, thermophysical, and environmental stresses over time.
Author: Joseph Irwin Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 116
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Category : Aeronautics
Languages : en
Pages : 772
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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: Kishore V. Pochiraju
Publisher: Springer Science & Business Media
ISBN: 1441993088
Category : Technology & Engineering
Languages : en
Pages : 681
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Book Description
Long-Term Durability of Polymeric Matrix Composites presents a comprehensive knowledge-set of matrix, fiber and interphase behavior under long-term aging conditions, theoretical modeling and experimental methods. This book covers long-term constituent behavior, predictive methodologies, experimental validation and design practice. Readers will also find a discussion of various applications, including aging air craft structures, aging civil infrastructure, in addition to engines and high temperature applications.
