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oai:dspace.mit.edu:1721.1/452672022-01-13T07:54:36Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024

David Wallace. Yeh, Chihjiun Connie Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Massachusetts Institute of Technology. Department of Mechanical Engineering 2009-04-29T17:17:38Z 2009-04-29T17:17:38Z 2008 2008 http://hdl.handle.net/1721.1/45267 310423072 Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008. Includes bibliographical references (p. 43). This project is a continuation in the investigation of ways in which cork can be incorporated into composite material for boats and kayaks without significant performance losses. Fiberglass lay-ups (cloth, mat, and epoxy) and cork-epoxy samples are prepared by vacuum bagging. Samples undergo a three-point bending test (ASTM D79o) and a Charpy impact test (ASTM D611o) to investigate maximum flexural stress, effective elastic modulus, and impact resistance. Fiberglass-epoxy samples serve as the control for comparing the results of the cork composite samples. The average flexural strength of the fiberglass ranged from 191-234 MPa with the different configurations of fiberglass cloth. The effective elastic modulus ranged from 8.4-10 MPa. These values fall in the lower range of other composites when compared to general Ashby charts. Its impact resistance, taken with respect to cross-sectional area to account for variations in the thickness from sample to sample in the formation process, ranged from 54.9 to 64.5 kJ/m2. The cork composite samples were at least four times weaker than their fiberglass counterparts in all investigated respects. However, the cork samples were up to three times lighter and needed less than half of the epoxy the fiberglass samples required. The inclusion of fiberglass cloth helped increase its strength significantly without sacrifice to weight, indicating the likely need to incorporate chopped fiberglass strands in future testing. by Chihjiun Connie Yeh. S.B. 43 p. eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Mechanical Engineering. Investigation of cork as filler for fiber-reinforced composite material in kayaks Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="008521fd-4efc-4832-a851-8a1ca9a7fdbf"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Investigation of cork as filler for fiber-reinforced composite material in kayaks</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2008</PublicationDate> <Authors> <Author> <DisplayName>Yeh, Chihjiun Connie</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Mechanical Engineering.</Keyword> <Abstract>This project is a continuation in the investigation of ways in which cork can be incorporated into composite material for boats and kayaks without significant performance losses. Fiberglass lay-ups (cloth, mat, and epoxy) and cork-epoxy samples are prepared by vacuum bagging. Samples undergo a three-point bending test (ASTM D79o) and a Charpy impact test (ASTM D611o) to investigate maximum flexural stress, effective elastic modulus, and impact resistance. Fiberglass-epoxy samples serve as the control for comparing the results of the cork composite samples. The average flexural strength of the fiberglass ranged from 191-234 MPa with the different configurations of fiberglass cloth. The effective elastic modulus ranged from 8.4-10 MPa. These values fall in the lower range of other composites when compared to general Ashby charts. Its impact resistance, taken with respect to cross-sectional area to account for variations in the thickness from sample to sample in the formation process, ranged from 54.9 to 64.5 kJ/m2. The cork composite samples were at least four times weaker than their fiberglass counterparts in all investigated respects. However, the cork samples were up to three times lighter and needed less than half of the epoxy the fiberglass samples required. The inclusion of fiberglass cloth helped increase its strength significantly without sacrifice to weight, indicating the likely need to incorporate chopped fiberglass strands in future testing.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>