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Use of Cube‐Corner Nano‐Indentation Crack Length Measurements to Estimate Residual Stresses Over Small Spatial Dimensions
Author(s) -
Tandon Rajan,
Buchheit Thomas E.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01389.x
Subject(s) - indentation , materials science , cube (algebra) , residual stress , composite material , stress intensity factor , cracking , length scale , cube root , superposition principle , geometry , fracture mechanics , mathematics , mechanics , physics , mathematical analysis
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.