Application of carbon-powder-polymer composite as a continuous crack-length sensor |
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Authors: | R Prabhakaran O F Lopez |
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Institution: | (1) Department of Mechanical Engineering, Old Dominion University, 23529 Norfolk, VA;(2) Structural Mechanics Branch, NASA Langley Research Center, 23665 Hampton, VA |
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Abstract: | This paper explores the application of carbon-powder-impregnated polymeric composites for measuring crack extensions. The
strain sensitivity of the gage material is shown to be very small. In the first series of tests, the gage material is characterized
by measuring the change in electrical resistance due to machined slits for various gage lengths. The measured response is
compared with the response predicted from a very simple electrical model. On the basis of good correlation and repeatability,
the usefulness of such gages to measure crack extensions is assessed by a second series of tests. Further work to improve
the gage response by optimizing the shape of the gage and making the gage and the adhesive layer thinner is proposed. The
presented concept, with improvements, can result in a reliable, inexpensive crack gage requiring inexpensive instrumentation.
Paper was presented at the 1990 SEM Spring Conference on Experimental Mechanics held in Albuquerque, NM on June 3–6. |
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