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Author: DL. Buchanan Publisher: ISBN: Category : Composite materials Languages : en Pages : 11
Book Description
The purpose of this research is to experimentally determine the combined influence of frequency and environmental conditions on dynamic behavior of graphite/epoxy composites. The new additions to the data base on dynamic behavior facilitate confident use of these composites in applications.
Author: DL. Buchanan Publisher: ISBN: Category : Composite materials Languages : en Pages : 11
Book Description
The purpose of this research is to experimentally determine the combined influence of frequency and environmental conditions on dynamic behavior of graphite/epoxy composites. The new additions to the data base on dynamic behavior facilitate confident use of these composites in applications.
Author: Christopher C. Pauly Publisher: ISBN: Category : Nature Languages : en Pages : 64
Book Description
The increasing acceptance and incorporation of fiber-reinforced polymer matrix composites (PMCs) as engineering construction materials have led many to look to the infrastructure as an application for these versatile materials. One such system is pultruded graphite fiber-reinforced epoxy (graphite/epoxy). Some PMC systems degrade when subjected to environmental conditions (e.g., moisture, stress, UV light, electrochemical polarization). These variables are typically studied either singularly or in series, but in real applications (e.g., aerospace, marine, infrastructure), these materials are subjected to many of these conditions simultaneously. To simulate field conditions, this study investigated the combined effects of an aqueous environment, electrochemical polarization, and applied bending stress on the durability of a pultruded graphite/epoxy composite. The findings indicate that graphite/epoxy composites cannot be assumed to be insensitive to degradation by environmental variables. Further, electrochemical polarization, as might occur with contact with a metal such as a fastener, can accelerate degradation. This damage requires the presence of moisture. Chloride and sulfate concentrations in rain are sufficient to establish an electrolyte within creviced regions, but deicing salts would overtake these as a contributor to conductivity. Further findings may be summarized as follows: 1.) Application of polarization in an aerated 0.6M NaCl environment led to breakdown of the fiber/matrix interface. The high pH environment created during the oxygen reduction reaction was necessary but not sufficient to create this breakdown, as the unpolarized specimen exposed to a pH 13 environment did not degrade. Cathodic polarization as would occur by coupling to steel or aluminum is required. 2.)Application of cathodic polarization did not significantly alter strength. Average measurements of shear strength, however, did decrease with the application of cathodic polarization for 70 and 90 days.
Author: RP. Briley Publisher: ISBN: Category : Composite materials Languages : en Pages : 13
Book Description
The objective of this research is to experimentally determine the effects of hostile, hygrothermal environments on the dynamic behavior of graphite/epoxy composites.
Author: CL. Leung Publisher: ISBN: Category : Composites Languages : en Pages : 8
Book Description
In a study of T300/934 graphite/epoxy composite, which forms the composite skin of the space shuttle cargo bay doors, the following composite properties were investigated as a function of increasing gamma-radiation exposure dosages: directional moisture absorption/desorption kinetics, glass transition temperatures, interlaminar shear strength and damping peaks (tan ?). Irradiation conditions were: open to atmosphere and vacuum, ambient and high temperature (100°C).
Author: DL. Buchanan
Author: DL. Buchanan
Author: L. W. Rehfield
Author: Sang Chel Kim
Author: Isaac M. Daniel
Author: Christopher C. Pauly
Author: 
Author: RP. Briley
Author: 
Author: CL. Leung
Author: Henry Robert Phelps