Void Growth and Collapse in a Creeping Single Crystal Metadata

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Title

  • Main Title Void Growth and Collapse in a Creeping Single Crystal

Creator

  • Author: Srivastava, Ankit
    Creator Type: Personal

Contributor

  • Chair: Needleman, Alan
    Contributor Type: Personal
    Contributor Info: Major Professor
  • Committee Member: Srivilliputhur, Srinivasan G.
    Contributor Type: Personal
  • Committee Member: Wang, Zhiqiang
    Contributor Type: Personal

Publisher

  • Name: University of North Texas
    Place of Publication: Denton, Texas
    Additional Info: Web: www.unt.edu

Date

  • Creation: 2011-08

Language

  • English

Description

  • Content Description: Aircraft engine components can be subjected to a large number of thermo-mechanical loading cycles and to long dwell times at high temperatures. In particular, the understanding of creep in single crystal superalloy turbine blades is of importance for designing more reliable and fuel efficient aircraft engines. Creep tests on single crystal superalloy specimens have shown greater creep strain rates for thinner specimens than predicted by current theories. Therefore, it is necessary to develop a more predictive description of creep processes in these materials for them to be used effectively. Experimental observations have shown that the crystals have an initial porosity and that the progressive growth of these voids plays a major role in limiting creep life. In order to understand void growth under creep in single crystals, we have analyzed the creep response of three dimensional unit cells with a single spherical void under different types of isothermal creep loading. The growth behavior of the void is simulated using a three dimensional rate dependent crystal plasticity constitutive relation in a quasi-static finite element analysis. The aim of the present work is to analyze the effect of stress traixiality and Lode parameter on void growth under both constant true stress and constant engineering stress isothermal creep loading.

Subject

  • Keyword: creep
  • Keyword: single crystal
  • Keyword: finite element
  • Keyword: superalloy
  • Keyword: crystal plasticity

Collection

  • Name: UNT Theses and Dissertations
    Code: UNTETD

Institution

  • Name: UNT Libraries
    Code: UNT

Rights

  • Rights Access: public
  • Rights Holder: Srivastava, Ankit
  • Rights License: copyright
  • Rights Statement: Copyright is held by the author, unless otherwise noted. All rights reserved.

Resource Type

  • Thesis or Dissertation

Format

  • Text

Identifier

  • Archival Resource Key: ark:/67531/metadc84281

Degree

  • Degree Grantor: University of North Texas
  • Academic Department: Department of Materials Science and Engineering
  • Degree Discipline: Materials Science and Engineering
  • Degree Level: Master's
  • Degree Name: Master of Science
  • Degree Publication Type: thesi
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