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: Effects of moisture on composite materials
  name:
    name part: Tsotsis, Thomas Karl
    name part: 1961-
    role:
      role term: creator
  name:
    name part: Bradley, W.
    role:
      role term: degree supervisor.
  name:
    name part: Weitsman, Y.
    role:
      role term: degree supervisor.
  name:
    name part: Hoeve, C.
    role:
      role term: degree committee member.
  name:
    name part: Schapery, R.
    role:
      role term: degree committee member.
  name:
    name part: Walton, J.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1989
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xxi, 250 leaves : illustrations ; 29 cm
  abstract: The objective of this research was to investigate various aspects of the effects of moisture on composite materials in order to obtain a physical-chemical understanding of moisture absorption and damage mechanisms in fiber/polymeric matrix composite materials. The physical and chemical processes accompanying the absorption and diffusion of moisture were assessed by examining different diffusion models for polymers and composites as well as by evaluating their effect on the degradation of properties of composite materials. A mathematical description of damage in composites was formed using solutions to two boundary value problems describing the behavior of an inclusion (fiber) embedded in an infinite matrix both with and without the presence of a circumferential crack. Solutions to these problems were used in conjunction with finite element calculations of the stress state around graphite fibers (in a square or hexagonal array) embedded in epoxy matrix and subjected to thermal and moisture loading in order to characterize fracture due to moisture. Numerical and analytical calculations of the energy available for crack propagation due to thermally- and moisture-induced residual stresses indicate that very low energies are needed to advance such cracks. Additionally, stresses along the interface were in all cases less than the matrix ultimate strength. This suggests that moisture degrades the fiber-matrix interface. Experimentally, the effects of cyclic humidity exposure at a constant temperature on the tensile, compressive, and fracture properties of AS4/3502 graphite/epoxy composite material were measured. Results show little change in of mechanical properties due to damage from moisture absorption except for the case of [90°]₈ specimens. This indicates that other than for this case, there is no macroscopically observable change in material properties for the cycling conditions considered here, although microscopic damage is present due to the humidity cycling. The e…
  note: by Thomas Karl Tsotsis.
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Mechanical Engineering."
  note: Ph. D. Texas A & M University 1989
  note: Includes bibliographical references.
  subject:
    topic: Composite materials
    topic: Effect of moisture on
  subject:
    topic: Composite materials
    topic: Testing
  subject:
    topic: Composite materials
    topic: Testing
  subject:
    topic: Mechanical Engineering
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 900723
    record change date: 20200904152457.0
    record identifier: in00000917306
    language of cataloging:
      language term: eng