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Environmental Degradation of Industrial Composites

Environmental Degradation of Industrial Composites
Author: Celine A Mahieux
Publisher: Elsevier
Total Pages: 323
Release: 2005-12-14
Genre: Technology & Engineering
ISBN: 0080531059

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Thanks to their low density and tailored properties, polymer matrix composites are attractive candidates for a large number of industrial applications ranging from aerospace to transportation and energy. However, the behaviour of polymer-based materials is strongly affected by a number of environmental factors. Environmental Degradation in Industrial Composites provides vital information on the effects of environmental factors such as temperature, liquid and gas exposure, electrical fields and radiations, and how micro- and micromechanical calculations during design and manufacture must take these effects into account. The book concludes with reviews on standard and specific testing methods for the various environmental factors and their combinations, helping mechanical/materials engineers and specifiers to predict possible changes due to environmental conditions. Each chapter is supplemented by industrial case studies to help in the understanding of degradation of composites in real life situations.This book will help you to...* Understand how environmental factors lead to degradation effects in polymer matrix composite structures* Build these factors into calculations when predicting the part performance and lifetime of structures* Compare real-life situations from case studies with your predicted results* Predict probable composite behaviour with greater accuracy This book will help you to...* Understand how environmental factors lead to degradation effects in polymer matrix composite structures* Build these factors into calculations when predicting the part performance and lifetime of structures* Compare real-life situations from case studies with your predicted results* Predict probable composite behaviour with greater accuracy


Environmental Effects on Polymer-Matrix Composites

Environmental Effects on Polymer-Matrix Composites
Author:
Publisher:
Total Pages: 0
Release: 1997
Genre:
ISBN:

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A variety of environmental factors can influence the performance of advanced polymers and composites. In particular, exposure to a combination of moisture and elevated temperature can significantly alter properties. The extent of chemical and physical changes is a function of exposure time and the temperature and humidity of the environment. This work discusses the effects of chemical and physical aging of AFR700B, a high-temperature addition polyimide resin. Neat resin samples were isothermally aged for 500 and 1000 hours at 250 deg C in dry air, humid air, and dry nitrogen. Changes in the dynamic mechanical properties and weight of the resin samples after these different exposures are discussed. An accelerated aging process was developed to facilitate the study of hydrolytic degradation. The effect of degradation on the Tg, weight, and mechanical behavior is discussed. The use of a silicon-nitride moisture barrier proved ineffective.


Fibrous Polymeric Composites

Fibrous Polymeric Composites
Author: Bankim Chandra Ray
Publisher: CRC Press
Total Pages: 172
Release: 2018-05-20
Genre: Technology & Engineering
ISBN: 0429013949

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This book emphasizes the scientific origin of deformation and damage of FRP composites under various environmental effects and analyses present understanding on degradation mechanisms, role of interfaces and addition of nanofillers Discusses micro-characterization of composites and interfaces, also includes micro-mechanisms and microscopic evidences to establish the structure-property correlation Elucidates advantages and limitations of FRP composites in supercritical applications


Going to Extremes

Going to Extremes
Author: National Research Council
Publisher: National Academies Press
Total Pages: 80
Release: 2005-10-22
Genre: Technology & Engineering
ISBN: 0309097150

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Advanced polymer matrix composites (PMC) have many advantages such as light weight and high specific strength that make them useful for many aerospace applications. Enormous uncertainty exists, however, in predicting long-term changes in properties of PMCs under extreme environmental conditions, which has limited their use. To help address this issue, the Department of Defense requested a study from the NRC to identify the barriers and limitations to the use of PMCs in extreme environments. The study was to focus on issues surrounding methodologies for predicting long-term performance. This report provides a review of the challenges facing application of PMCs in extreme environments, the current understanding of PMC properties and behavior, an analysis of the importance of data in developing effective models, and recommendations for improving long-term predictive methodologies.


Marine Environmental Effects on Polymer Matrix Composites

Marine Environmental Effects on Polymer Matrix Composites
Author: LA. Carlsson
Publisher:
Total Pages: 21
Release: 1995
Genre: Composite materials
ISBN:

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Degradation of polymeric matrix composite materials in marine environments has been experimentally investigated. Carbon/epoxy, carbon/bismaleimeide-epoxy, glass/epoxy and glass/PPS, and neat PPS were examined. The environments considered were distilled water and natural seawater at room temperature and 35°C. Water absorption was monitored during seven months of immersion. Several specimen geometries were investigated which allowed determination of longitudinal and transverse diffusivities. Degradation of mechanical performance due to water absorption was examined through transverse tension testing of dry and wet composites. The transverse modulus of the thermoset composites remained virtually unaffected by water absorption, while the modulus of glass/PPS dropped substantially, apparently due to extensive fiber/matrix debonding induced by water absorption. Transverse tensile strength was drastically reduced after water absorption for all composites. The composites degraded similarly in distilled water and seawater. Inspection of the fracture surfaces of dry and wet composites in a scanning electron microscope indicated that fiber/matrix adhesion was adequate in the dry composites, while in the wet composites numerous bare debonded fibers were observed, which substantiates that the reduction in transverse strength is largely due to fiber/matrix interfacial degradation.


High Temperature and Environmental Effects on Polymeric Composites

High Temperature and Environmental Effects on Polymeric Composites
Author: Charles E. Harris
Publisher: ASTM International
Total Pages: 223
Release: 1993
Genre: Polymeric composites
ISBN: 0803114915

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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.