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Diffusion of Seawater within Unidirectional Carbon/Vinylester
Title
Diffusion of Seawater within Unidirectional Carbon/Vinylester.
Creator
Fichera, Maryann, Carlsson, Leif A., Graduate College
Abstract/Description
The objective of this work is to characterize the moisture transport in a unidirectional, transversely isotropic carbon/vinylester composite. Diffusion occurs when the material is immersed in sea water and the moisture is transported through the voids, and interface gaps. This uptake of moisture can cause problems including matrix degradation and swelling, reduction of fiber/matrix interface strength, etc. To characterize water transport, three diffusivities are required, D1, D2, and D3....
Show moreThe objective of this work is to characterize the moisture transport in a unidirectional, transversely isotropic carbon/vinylester composite. Diffusion occurs when the material is immersed in sea water and the moisture is transported through the voids, and interface gaps. This uptake of moisture can cause problems including matrix degradation and swelling, reduction of fiber/matrix interface strength, etc. To characterize water transport, three diffusivities are required, D1, D2, and D3. However, transversely isotropic material can be characterized by two diffusivities, along and transverse to the fibers (D1=DL, and D2=D3=DT). Composite materials may absorb moisture along the fiber/matrix interface, especially if the ends of the fibers are exposed. This mechanism of moisture transport inside the composite is known as “wicking”, which would increase the value of DL. Wicking is promoted by voids and unbonded regions between the fiber and matrix. Experiments will be conducted on specimens made from vinylester resin reinforced with unidirectional carbon fibers. A range of specimens will be prepared and immersed in 40°C sea water. The moisture content will be monitored until maximum saturation. Previous studies indicate that the Fickian diffusion model is a reasonable descriptor of the moisture absorption process. From the plots of moisture content versus time1/2, the apparent diffusivity will be reduced for the different size panels. The longitudinal and transverse diffusivities will be determined using a Matlab algorithm. The amount of moisture absorbed into the composite due to wicking will be quantified from mass balance analysis and related to the longitudinal and transverse diffusivities.
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Date Issued
2014
PURL
http://purl.flvc.org/fau/fd/FA00005815
Format
Document (PDF)
Mystery Twofold
Title
Mystery Twofold.
Creator
Fichera, Maryann [Choreographer], Kawashima, Emilia [Choreographer], Dorothy F. Schmidt College of Arts and Letters, Glass, Philip [Music], Department of Theatre and Dance
Abstract/Description
The Dances We Dance Performance Showcase is a capstone experience for students enrolled in all levels of the Department of Theatre and Dance performance course offerings.
Date Issued
2009
PURL
http://purl.flvc.org/fau/fd/FAdwd09mys
Subject Headings
Dance performance
Format
Set of related objects
Transport of seawater and its influence on the transverse tensile strength of unidirectional composite materials
Title
Transport of seawater and its influence on the transverse tensile strength of unidirectional composite materials.
Creator
Fichera, Maryann, Carlsson, Leif A., Florida Atlantic University, College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
The objective of this research was to characterize the seawater transport and its effect on the transverse tensile strength of a carbon/vinylester composite. The moisture contents of neat vinylester and unidirectional carbon/vinylester composite panels immersed in seawater were monitored until saturation. A model for moisture up-take was developed based on superposition of Fickian diffusion, and Darcy’s law for capillary transport of water. Both the predicted and measured saturation times...
Show moreThe objective of this research was to characterize the seawater transport and its effect on the transverse tensile strength of a carbon/vinylester composite. The moisture contents of neat vinylester and unidirectional carbon/vinylester composite panels immersed in seawater were monitored until saturation. A model for moisture up-take was developed based on superposition of Fickian diffusion, and Darcy’s law for capillary transport of water. Both the predicted and measured saturation times increased with increasing panel size, however the diffusion model predicts much longer times while the capillary model predicts shorter time than observed experimentally. It was also found that the saturation moisture content decreased with increasing panel size. Testing of macroscopic and miniature composite transverse tensile specimens, and SEM failure inspection revealed more fiber/matrix debonding in the seawater saturated composite than the dry composite, consistent with a slightly reduced transverse tensile strength.
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Date Issued
2015
PURL
http://purl.flvc.org/fau/fd/FA00004368, http://purl.flvc.org/fau/fd/FA00004368
Subject Headings
Composite materials -- Deterioration, Composite materials -- Effect of environment on, Engineering design, Marine engineering, Polymers -- Permeability, Polymetric composites -- Deterioration
Format
Document (PDF)