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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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An integrated approach is presented to detect pipeline defects using distributed acoustic sensors and machine learning. Over 80% accuracy for defected pipe identification was achieved with defect depth classifications with error less than 1-mm.
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Structural application of advanced composite filamentary materials requires lamination of the basic orthotropic plies into angle-ply laminates. This article reviews the effect on elastic properties of orientation dispersion. The conventional constitutive relations are recast in a homologous form to account for uniform orientation dispersion by addition of a single parameter. Graphical results are presented to show the behavior of the most important advanced composite materials. The results are directly useful for estimating effects of manufacturing inaccuracy and for design of partially oriented reinforced structures.
A technique is described that makes it possible to transmit and receive bulk ultrasonic waves launched from the same surface of a composite sheet by means of transducers mounted on variable angle blocks. A straightforward approach to measure the velocity and attenuation of this wave is presented. A bulk compressional wave of 930,000 cm/sec velocity was launched and received in this manner in an 8-ply unidirectional T-300-5208 epoxy composite. Preliminary results indicate that parameters associated with this wave might be sensitive to accumulated damage in a composite; thus, the technique has a potential for NDE in structures made from composite materials.
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Abstract not provided.
Abstract not provided.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.