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Engineers at Southwest Research Institute have developed new multi-layer thin films and combined them with magnetostrictive sensors to nondestructively detect and monitor defects in aircraft components. The probe and sensor were evaluated on an A-10 aircraft test article and successfully detected a crack and monitored its growth. Unlike MsS methods that evaluate flaws in pipeline, the MsS method for aircraft does not require the use of external magnets.
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Evaluations performed with the new thin-film magnetostrictive sensor detected a 0.035-inch crack in an A-10 aircraft (control point 47) test article. As SwRI engineers applied loads to grow the crack, the sensor, approximately 2.75 inches from the crack, successfully measured the growth until it reached 0.377-inch. These data illustrate the effectiveness of the sensor as a monitoring tool.
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This defect data plot reveals good correlation (linearity) between the signal amplitude and defect size, as measured by SwRI’s thin-film magnetostrictive sensor.
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