rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    title: Tensile true stress - strain curves and essential work of fracture analysis of polyethylene blown films
  name:
    name part: Lee, Chin-Fu
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Su, Hung-Jue
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2015
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Characterization of mode-I fracture toughness of ductile polymeric thin films is nontrivial. In order to gain understanding about the fracture mechanics and the processing-structure-property relationships of metallocene linear low-density polyethylene (m-LLDPE) thin film, a custom-built double-edge notched tensile (DENT) test fixture was developed to perform the mode-I fracture test on m-LLDPE thin films, and the essential work of fracture (EWF) analysis, which employs an unique energy partitioning concept, was used to characterize the fracture toughness of the thin films. Effects of specimen geometry, strain rate, film orientation, processing parameters, and resin densities on the specific essential work of fracture, we, and the specific non-essential work of fracture, wp, were investigated. The usefulness of the methodology incorporating the EWF analysis and the custom-built film fixture for characterizing LLDPE fracture toughness is evaluated and discussed, and the correlations between the EWF parameters and the films' Elmendorf tear properties were also made. The visual, full-field stress distributions of the EWF film specimens were measured in-situ during mode-I facture testing by the photoelastic method, and the deformation in the process zone of post-mortem specimen was also characterized. A new experimental approach has been developed to directly quantify and partition the total mode-I fracture energy of m-LLDPE blown films. Three distinctive deformation zones have been identified from the photoelastic observation of the m-LLDPE blown films during the mode-I facture testing. These three zones include the essential work zone due to necking and crack propagation, the non-essential plastic deformation zone, and a newly proposed recoverable viscoelastic deformation zone. The tensile true stress-strain curves of m-LLDPE blown films and the full-field strain mapping of the mode-I DENT specimen were generated to allow for quantitative energy partitioning at each de…
  note: by Chin-Fu Lee.
  note: "Major Subject: Materials Science and Engineering."
  note: Includes vita.
  note: Doctor of Philosophy Texas A & M University 2015 http://hdl.handle.net/1969.1/155256
  note: Includes bibliographical references.
  note: Text (Dissertation)
  subject:
    topic: Major Materials Science and Engineering
  subject:
    topic: fracture toughness
  subject:
    topic: polyolefin
  identifier: http://hdl.handle.net/1969.1/155256
  record info:
    record content source: TXA
    record creation date: 160211
    record change date: 20170928111611.0
    record identifier: in00003604425
    language of cataloging:
      language term: eng