Subcritical Crack Growth in Ceramic Composites at High Temperature Measured Using Digital Image Correlation

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Description

An in situ experimental technique is described that allows high resolution, high sensitivity determination of displacements and full-field strains during high temperature mechanical testing. The technique is used to investigate elevated temperature crack growth in SiC/Nicalon sub f composites. At 1150 degrees C, the reinforcing fibers have a higher creep susceptibility than the matrix. Fiber creep leads to relaxation of crack bridging tractions, resulting in subcritical crack growth. Differential image analysis is used to measure the crack opening displacement profile u(x) of an advancing, bridged crack. With appropriate modeling, such data can be used to determine the traction law, from ... continued below

Physical Description

14 p.

Creation Information

Mumm, D.R.; Morris, W.L.; Dadkhah, M.S. & Cox, B.N. January 11, 1996.

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Description

An in situ experimental technique is described that allows high resolution, high sensitivity determination of displacements and full-field strains during high temperature mechanical testing. The technique is used to investigate elevated temperature crack growth in SiC/Nicalon sub f composites. At 1150 degrees C, the reinforcing fibers have a higher creep susceptibility than the matrix. Fiber creep leads to relaxation of crack bridging tractions, resulting in subcritical crack growth. Differential image analysis is used to measure the crack opening displacement profile u(x) of an advancing, bridged crack. With appropriate modeling, such data can be used to determine the traction law, from which the mechanics of cracking and failure may be determined.

Physical Description

14 p.

Notes

Rockwell Science Center, Thousand Oaks, CA (US); OSTI as DE00003042

Medium: P; Size: 14 pages

Source

  • Other Information: Supercedes report DE00003042; Submitted to American Society for Testing and Materials; ASTM STP 1309; PBD: 11 Jan 1996

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  • Report No.: NONE
  • Grant Number: FG03-89ER45400
  • Office of Scientific & Technical Information Report Number: 3042
  • Archival Resource Key: ark:/67531/metadc682650

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 11, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • April 7, 2017, 2:32 p.m.

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Mumm, D.R.; Morris, W.L.; Dadkhah, M.S. & Cox, B.N. Subcritical Crack Growth in Ceramic Composites at High Temperature Measured Using Digital Image Correlation, book, January 11, 1996; (digital.library.unt.edu/ark:/67531/metadc682650/: accessed May 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.