Method of continuously determining crack length
First Claim
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1. A method of continuously determining the length of a crack in a specimen comprising the steps of:
- bonding a conducting substrate having a continuous length to the specimen,measuring a resistance continuously across the conducting substrate as a crack propagates in the specimen and in the substrate along the length of the substrate; and
correlating a change in the measured resistance across the conducting substrate with the length of the specimen crack.
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Abstract
A crack length sensor is fabricated in a rectangular or other geometrical form from a conductive powder impregnated polymer material. The long edges of the sensor are silver painted on both sides and the sensor is then bonded to a test specimen via an adhesive having sufficient thickness to also serve as an insulator. A lead wire is connected to each of the two outwardly facing silver painted edges. The resistance across the sensor changes continuously as a function of the crack length in the specimen and sensor.
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Citations
12 Claims
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1. A method of continuously determining the length of a crack in a specimen comprising the steps of:
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bonding a conducting substrate having a continuous length to the specimen, measuring a resistance continuously across the conducting substrate as a crack propagates in the specimen and in the substrate along the length of the substrate; and correlating a change in the measured resistance across the conducting substrate with the length of the specimen crack. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification