Effects Of Elevated Temperature On The Viscoplastic Modeling Of Graphite Polymeric Composites

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Effects of Elevated Temperature on the Viscoplastic Modeling of Graphite/Polymeric Composites

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Page : 32 pages
File Size : 55,6 Mb
Release : 2018-07-02
Category : Electronic
ISBN : 1722194324

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Effects of Elevated Temperature on the Viscoplastic Modeling of Graphite/Polymeric Composites by National Aeronautics and Space Administration (NASA) Pdf

To support the development of new materials for the design of next generation supersonic transports, a research program is underway at NASA to assess the long term durability of advanced polymer matrix composites (PMC's). One of main objectives of the program was to explore the effects of elevated temperature (23 to 200 C) on the constitutive model's material parameters. To achieve this goal, test data on the observed nonlinear, stress-strain behavior of IM7/5260 and IM7/8320 composites under tension and compression loading were collected and correlated against temperature. These tests, conducted under isothermal conditions using variable strain rates, included such phenomena as stress relaxation and short term creep. The second major goal was the verification of the model by comparison of analytical predictions and test results for off axis and angle ply laminates. Correlation between test and predicted behavior was performed for specimens of both material systems over a range of temperatures. Results indicated that the model provided reasonable predictions of material behavior in load or strain controlled tests. Periods of loading, unloading, stress relaxation, and creep were accounted for. Gates, Thomas S. Langley Research Center RTOP 505-63-50-04...

High Temperature and Environmental Effects on Polymeric Composites

Author : Charles E. Harris,Thomas S. Gates
Publisher : ASTM International
Page : 223 pages
File Size : 40,9 Mb
Release : 1993
Category : Polymeric composites
ISBN : 9780803114913

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High Temperature and Environmental Effects on Polymeric Composites by Charles E. Harris,Thomas S. Gates Pdf

Aerospace and naval applications of polymers in conditions once thought too harsh for them, take center stage in the survey of how polymer composites react to environmental conditions. A dozen papers from a symposium in San Diego, October 1991, describe damage mechanisms and failure, materials behavior under combined effects, and constitutive models, sometimes considering polymers as a whole, but more often specific groups or composites. No index. Annotation copyright by Book News, Inc., Portland, OR.

High Temperature and Environmental Effects on Polymeric Composites

Author : Thomas S. Gates,Abdul-Hamid Zureick
Publisher : ASTM International
Page : 276 pages
File Size : 49,9 Mb
Release : 1997
Category : Technology & Engineering
ISBN : 0803124244

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High Temperature and Environmental Effects on Polymeric Composites by Thomas S. Gates,Abdul-Hamid Zureick Pdf

Time Dependent and Nonlinear Effects in Polymers and Composites

Author : Richard Allan Schapery
Publisher : ASTM International
Page : 380 pages
File Size : 53,6 Mb
Release : 2000
Category : Composite materials
ISBN : 9780803126015

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Time Dependent and Nonlinear Effects in Polymers and Composites by Richard Allan Schapery Pdf

Annotation Improved reliability in commercial and military applications requires improved understanding of and predictive models for the time- dependent and nonlinear mechanical behavior of polymeric composites. The May 1998 American Society for Testing and Materials symposium sought to fuse the efforts in this direction of specialists in polymers and composites; these 18 papers are therefore grouped under the subheadings of polymers and composites. Primary polymer topics are chemical and physical aging, nonlinear viscoelasticity, and viscoplasticity. Composites' issues include: the effect of physical aging on time-dependent behavior, multiaxial nonlinear effects, compressive behavior, nonlinear viscoelasticity and viscoplasticity, failure mechanisms, hygrothermal effects, durability, and accelerated strength testing. Schapery is affiliated with the U. of Texas at Austin, and Sun is at Purdue U. Annotation copyrighted by Book News, Inc., Portland, OR.

Creep and Fatigue in Polymer Matrix Composites

Author : Rui Miranda Guedes
Publisher : Woodhead Publishing
Page : 586 pages
File Size : 40,7 Mb
Release : 2019-03-14
Category : Technology & Engineering
ISBN : 9780081026021

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Creep and Fatigue in Polymer Matrix Composites by Rui Miranda Guedes Pdf

Creep and Fatigue in Polymer Matrix Composites, Second Edition, updates the latest research in modeling and predicting creep and fatigue in polymer matrix composites. The first part of the book reviews the modeling of viscoelastic and viscoplastic behavior as a way of predicting performance and service life. Final sections discuss techniques for modeling creep rupture and failure and how to test and predict long-term creep and fatigue in polymer matrix composites. Reviews the latest research in modeling and predicting creep and fatigue in polymer matrix composites Puts a specific focus on viscoelastic and viscoplastic modeling Features the time-temperature-age superposition principle for predicting long-term response Examines the creep rupture and damage interaction, with a particular focus on time-dependent failure criteria for the lifetime prediction of polymer matrix composite structures that are illustrated using experimental cases

Composite Materials

Author : Eugene T. Camponeschi
Publisher : ASTM International
Page : 360 pages
File Size : 50,7 Mb
Release : 1993
Category : Composite materials
ISBN : 9780803118799

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Composite Materials by Eugene T. Camponeschi Pdf

Introduction to the Dimensional Stability of Composite Materials

Author : Ernest G. Wolff
Publisher : DEStech Publications, Inc
Page : 444 pages
File Size : 53,9 Mb
Release : 2004
Category : Technology & Engineering
ISBN : 1932078223

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Introduction to the Dimensional Stability of Composite Materials by Ernest G. Wolff Pdf

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.

The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide

Author : Lee M. Nicholson
Publisher : Unknown
Page : 44 pages
File Size : 47,7 Mb
Release : 2000
Category : Molecular weights
ISBN : CHI:54582384

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The Combined Influence of Molecular Weight and Temperature on the Aging and Viscoelastic Response of a Glassy Thermoplastic Polyimide by Lee M. Nicholson Pdf

The effect of molecular weight on the viscoelastic performance of an advanced polymer (LaRC-SI) was investigated through the use of creep compliance tests. Testing consisted of short-term isothermal creep and recovery with the creep segments performed under constant load. The tests were conducted at three temperatures below the glass transition temperature of five materials of different molecular weight. Through the use of time-aging-time superposition procedures, the material constants, material master curves and aging-related parameters were evaluated at each temperature for a given molecular weight. The time-temperature superposition technique helped to describe the effect of temperature on the timescale of the viscoelastic response of each molecular weight. It was shown that the low molecular weight materials have higher creep compliance and creep rate, and are more sensitive to temperature than the high molecular weight materials. Furthermore, a critical molecular weight transition was observed to occur at a weight-average molecular weight of ~2500 g/mol below which, the temperature sensitivity of the time-temperature superposition shift factor increases rapidly. The short-term creep compliance data were used in association with Struik's effective time theory to predict the long-term creep compliance behavior for the different molecular weights. At long timescales, physical aging serves to significantly decrease the creep compliance and creep rate of all the materials tested.

Mechanics of Composite Materials and Structures

Author : Carlos A. Mota Soares,Cristóvão M. Mota Soares,Manuel J.M. Freitas
Publisher : Springer Science & Business Media
Page : 552 pages
File Size : 44,9 Mb
Release : 1999-08-31
Category : Science
ISBN : 0792358708

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Mechanics of Composite Materials and Structures by Carlos A. Mota Soares,Cristóvão M. Mota Soares,Manuel J.M. Freitas Pdf

A compact presentation of the foundations, current state of the art, recent developments and research directions of all essential techniques related to the mechanics of composite materials and structures. Special emphasis is placed on classic and recently developed theories of composite laminated beams, plates and shells, micromechanics, impact and damage analysis, mechanics of textile structural composites, high strain rate testing and non-destructive testing of composite materials and structures. Topics of growing importance are addressed, such as: numerical methods and optimisation, identification and damage monitoring. The latest results are presented on the art of modelling smart composites, optimal design with advanced materials, and industrial applications. Each section of the book is written by internationally recognised experts who have dedicated most of their research work to a particular field. Readership: Postgraduate students, researchers and engineers in the field of composites. Undergraduate students will benefit from the treatment of the foundations of the mechanics of composite materials and structures.

Applied Mechanics Reviews

Author : Anonim
Publisher : Unknown
Page : 338 pages
File Size : 49,5 Mb
Release : 1987
Category : Mechanics, Applied
ISBN : OSU:32435026160796

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Applied Mechanics Reviews by Anonim Pdf