Spatially resolved self-sensing of strain and damage in carbon fiber cement
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Spatially resolved self-sensing of strain and damage has been shown in carbon fiber cement under flexure by three-point bending. This involves measurement of the one-dimensional distribution of the DC electrical resistance by the use of surface electrical contacts on the bottom (tension) and top (compression) surfaces. For a span of 290 mm, a spatial resolution of 5 mm has been attained. The bottom surface resistance, which increases reversibly with strain and increases irreversibly with damage, is a more effective indicator of strain and damage (in combination) than the top surface resistance, the oblique resistance or the through-thickness resistance for spatially resolved self-sensing. For sensing without spatial resolution, the oblique resistance is the most effective indicator. For sensing with distinction between strain and damage, the top surface resistance is the most effective indicator.
KeywordsSilica Fume Surface Resistance Fractional Change Segment Versus Compression Surface
This work was supported in part by U.S. National Science Foundation.
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