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Use of Cube-Corner Nano-Indentation Crack Length Measurements to Estimate Residual Stresses Over Small Spatial Dimensions

Authors

  • Rajan Tandon,

    Corresponding author
    1. Materials Reliability and Materials Science and Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185
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  • Thomas E. Buchheit

    1. Microsystem Materials Department, Materials Science and Engineering, Sandia National Laboratories, Albuquerque, New Mexico 87185
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  • G. Pharr—contributing editor

†Author to whom correspondence should be addressed. e-mail: rtandon@sandia.gov

Abstract

Cube-corner indenters, by virtue of their acuity, possess a lowered threshold load for cracking. Shorter crack lengths allow the sampling of residual stresses in small spatial dimensions. We conducted cube-corner indentation on tempered and annealed glasses. Indentation crack geometry was found to be “quarter-penny.” A stress-intensity factor for this geometry, and crack length decrements on tempered materials were used in a stress-intensity superposition to provide reasonable estimates of residual stress. Stresses ∼100 MPa over a length scale of 10 μm, and 30 MPa over 20 μm were measured accurately, indicating that cube-corner indentation is a promising tool for materials characterization.

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