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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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The extension of the operation life of military and civilian aircraft rather than replacing them with new ones is increasing the probability of aircraft component failure as a result of aging. Aircraft that already have endured a long srvice life of more than 40 years are now being considered for another 40 years of service.
This paper discusses the fabrication aspects of a sensor device that is based on a sputter deposited, multilayer, giant magnetoresistive field sensor.
Contents: NASA HQ Code QW Message, NNWG Highlights, NNWG Personnel News, Current Events and Action Items, NASA Centers News and Announcements, Coming Events.
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The use of obliquely insonified ultrasonic waves has shown great promise in providing information about flaw characteristics and material properties of composite materials.
NOne given. Paper covers properties of composite materials.
Corrosion is a relatively slow material degradation process to which metallic structures of aircraft are subjected during service and it can appear in many forms.
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NASA is exploring the use of microwave spoof plasmon polaritons to detect defects in metallic structures. This work investigates the detection of simulated defects in the form of aluminum wires as small as 1.6 mm diameter and 2mm long that are placed in a grooved aluminum test article. The inclusions simulate manufacturing defects, and the sum of the delta impedance is shown to increase with increasing volume of added metal. A threshold value of 50Ω has been proposed for defect detection. In addition to detecting defects, the technique also estimates the volume of the defect.
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NASA is exploring the use of microwave spoof plasmon polaritons to detect defects in metallic structures. This work investigates the detection of simulated defects in the form of aluminum wires as small as 1.6 mm diameter and 2 mm long that are placed in a grooved aluminum test article. The inclusions simulate manufacturing defects, and the sum of the delta impedance is shown to increase with increasing volume of added metal. Based on the results, a threshold value of 50Ω has been proposed for defect detection. In addition to detecting defects, the technique also estimates the volume of the defect.