Abstract
A new method for measuring the strain around the high-temperature creep-crack tip is proposed in the present paper. A grid pattern was described in a space of about 30 μm with a diamond stylus in the area ahead of the precrack of the specimen. Then, the distortion of the grids and the change in specimen thickness which were induced by the creep deformation were measured by means of a photo-microscope and a roughness-measuring system, respectively. The three-dimensional components of the strain were calculated using the Lagrangian equation, into which the above measurement was introduced. The route of the creep-crack extension was examined in association with the local strain measured by the proposed method.
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Hatanaka, K., Fujimitsu, T. & Inoue, H. A measurement of three-dimensional strains around a creep-crack tip. Experimental Mechanics 32, 211–217 (1992). https://doi.org/10.1007/BF02319357
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DOI: https://doi.org/10.1007/BF02319357