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Permanent link (DOI): https://doi.org/10.7939/R3Q071

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Two New Approaches to Toughness Characterization of Polyethylene Open Access

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Other title
Subject/Keyword
polyethylene
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Cao, Wenrui
Supervisor and department
Ben Jar, P.-Y.
Examining committee member and department
Ben Jar, P.-Y.
Department
Department of Mechanical Engineering
Specialization

Date accepted
2011-08-22T16:20:44Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
A new mechanistic approach is applied to characterizing toughness of low-density polyethylene (LDPE) in ductile fracture, introduced in double-edge-notched tensile (DENT) test. Three mechanisms were involved in the new approach, i.e. fracture surface formation, necking and shear plastic deformation. The specific energy density for the fracture surface formation, determined from the new approach, was found to be about 12% higher than that from the original EWF method, and the specific energy density for necking is close to that determined from simple tensile test. Ultra-high-molecular-weight polyethylene (UHMWPE) was also characterized using DENT test. However, it was found that its fracture behavior cannot be described using the original EWF method, and since necking does not occur, nor by the new mechanistic approach. As a result, a modified EWF method was developed. To justify validity of the modified EWF method, a formulation of energy balance equation was established.
Language
English
DOI
doi:10.7939/R3Q071
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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