1998
DOI: 10.1111/j.1151-2916.1998.tb02312.x
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In Situ Measurements of Frictional Bridging Stresses in Alumina Using Fluorescence Spectroscopy

Abstract: Fracture of a large-grained alumina polycrystal has been examined in situ by optical microscopy. Concurrently, local bridging stresses, as generated by friction or tension of unbroken ligaments in the wake of the crack path, were measured by piezospectroscopy. Stress measurements were performed both at fixed sites as a function of the external load and at a fixed external load along the crack profile. Frictional stresses were ≈50 MPa, while unbroken ligaments between the crack faces were found to support tensi… Show more

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Cited by 45 publications
(29 citation statements)
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“…The frictional (average) bridging-stress component is approximately one order of magnitude larger than that detected via fluorescence spectroscopy in a coarse-grained Al 2 O 3 polycrystal. 18 The reason for such a difference is believed to originate from the elongated morphology of the Si 3 N 4 grains, versus the equiaxed morphology of Al 2 O 3 grains.…”
Section: May 1999mentioning
confidence: 98%
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“…The frictional (average) bridging-stress component is approximately one order of magnitude larger than that detected via fluorescence spectroscopy in a coarse-grained Al 2 O 3 polycrystal. 18 The reason for such a difference is believed to originate from the elongated morphology of the Si 3 N 4 grains, versus the equiaxed morphology of Al 2 O 3 grains.…”
Section: May 1999mentioning
confidence: 98%
“…We were encouraged to perform additional in situ COD experiments, because the magnitude of bridging stresses that were determined by Seidel and Rödel 22 in polycrystalline alumina was in good agreement with that which we have measured by using fluorescence spectroscopy on an Al 2 O 3 polycrystal with similar grain size. 18 After the magnitude/distribution of bridging microstresses has been determined either via Raman spectroscopy or through the mathematical deconvolution of COD data, it is possible to compute the increasing crack resistance theoretically, as a function of the crack length in the toughened material, and compare it with that which has been determined macroscopically via fracture tests. Usually, the bridging-stress distribution only can be calculated a posteriori from R-curve data.…”
Section: Introductionmentioning
confidence: 99%
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“…Stress gradients and stresses in very small regions, such as inside grain bridges at a crack surface, were measured using fluorescence spectroscopy [59][60][61]. One example is the luminescence lines of Cr + 3 that substitute for Al + 3 as a dopant in the alumina lattice.…”
Section: Residual Stress Measurements Using Raman and Fluorescence Spmentioning
confidence: 99%
“…3,[8][9][10][11][12][13]22 Yet, Raman spectrometers not being perfectly stable, accurate stress determination requires that these lines be pointed with respect to an absolute reference. This is done in Fig.…”
Section: Residual Stress Assessmentmentioning
confidence: 99%