Stress measurement with non-indentation

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Description

The feasibility of using nano-indentation to measure residual stress in glasses was studied. Indents were placed on the side of flexure specimens at four different distances from the neutral axis while the specimens were under load in four-point-bending. Three different glasses (soda-lime, boro-silicate, and fused silica) were indented with a cube-corner indenter using 2 to 30 mN indentation loads. A high resolution scanning electron microscope was used to measure the length of the cracks emanating from the corners of the indents while the specimen remained under load. The measured crack lengths were correlated to the local stress using indentation theory. ... continued below

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6 p.

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Jakus, K.; Evans, N.D. & Hay, J.C. November 1998.

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  • Jakus, K. Univ. of Massachusetts, Amherst, MA (United States)
  • Evans, N.D. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
  • Hay, J.C. IBM Research, Yorktown Heights, NY (United States). T.J. Watson Research Center

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Description

The feasibility of using nano-indentation to measure residual stress in glasses was studied. Indents were placed on the side of flexure specimens at four different distances from the neutral axis while the specimens were under load in four-point-bending. Three different glasses (soda-lime, boro-silicate, and fused silica) were indented with a cube-corner indenter using 2 to 30 mN indentation loads. A high resolution scanning electron microscope was used to measure the length of the cracks emanating from the corners of the indents while the specimen remained under load. The measured crack lengths were correlated to the local stress using indentation theory. For the correlation, elastic beam theory was used to calculate the magnitude of the local stress at the indentation sites. Results derived from crack lengths were in good agreement with local stress within experimental scatter. However, this scatter was found to be rather large as a result of the stochastic nature of crack formation. It can be concluded from this study that nano-indentation can be used to measure residual surface stresses with high spatial resolution provided that a sufficient number of indents are used to assure good statistical accuracy.

Physical Description

6 p.

Notes

OSTI as DE99000211

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  • Innovative materials in advanced energy technologies, Florence (Italy), 14-19 Jun 1998

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  • Other: DE99000211
  • Report No.: ORNL/CP--99248
  • Report No.: CONF-980604--
  • Grant Number: AC05-96OR22464;AC05-76OR00033
  • DOI: 10.2172/676871 | External Link
  • Office of Scientific & Technical Information Report Number: 676871
  • Archival Resource Key: ark:/67531/metadc702873

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

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Creation Date

  • November 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 23, 2016, 3:22 p.m.

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Jakus, K.; Evans, N.D. & Hay, J.C. Stress measurement with non-indentation, report, November 1998; Tennessee. (digital.library.unt.edu/ark:/67531/metadc702873/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.