Development of microwave NDT inspection techniques for large solid propellant rocket motors Final report
Microwave nondestructive testing techniques for large solid propellant rocket engines
Eckert, T. E.↗
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Results for “Inspection”
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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Optical inspection apparatus Patent
Optical apparatus for visual detection of roundness and regularity of cone surfaces
Groth, W. G.↗
Ultrasonics used for high-precision nondestructive inspection of brazed joints
Technique detects voids greater than or equal to 0.1016 cm in braze depths of 0.254 cm, detecting voids of smaller dimensions is possible. Internal design ensures control of beam's water path length to within 0.635 cm, this length is critical to system's accuracy.
Peterson, R. M.↗
Ultrasonic scanning system for in-place inspection of brazed-tube joints
System detects defects of .051 cm in diameter and larger. System incorporates scanning head assembly including boot enclosed transducer, slip ring assembly, drive mechanism, and servotransmitter. Ultrasonic flaw detector, prototype recorder, and special recorder complete system.
Haralson, H. S.↗
Scale factor gage for fiber optics inspection device
Flexible wire device, fastened along outside of fiber bundle from viewing portion to tip, positions calibrated adjustable gage in field of view. Scale factor is determined from known magnification characteristics of fiber optics system or from graduations on gage tip.
Mcmahon, W.↗
Determination of bonding parameters and inspection techniques for cadmium-to-stainless steel bonds and assembly of two capsule housings Final report
Bonding parameters and quality control for cadmium-stainless steel clad fuel pellet containment vessel production
Gripshover, P. J.↗
Inspection gage for boss Patent
Gage for quality control of sealing surfaces of threaded boss
Jordon, W. J.↗
Post test inspection of three Brayton rotating units
Post test analysis of closed Brayton cycle space electric power conversion system for space
Dunn, J. H.↗
Operation and post-test inspection of the SNAP-8 pre-prototype boiler P/N CF 751840, S/N 2
Performance testing of SNAP 8 boiler
Chalpin, E. S.↗
Improved optical filters for automated visual inspection
Sides of spatial filter slits are shaped so that their contribution to signal is reduced, thus minimizing the number of scanning errors.
Curtis, D. A.↗
A comparison of reliability and conventional estimation of safe fatigue life and safe inspection intervals
Both the conventional and reliability analyses for determining safe fatigue life are predicted on a population having a specified (usually log normal) distribution of life to collapse under a fatigue test load. Under a random service load spectrum, random occurrences of load larger than the fatigue test load may confront and cause collapse of structures which are weakened, though not yet to the fatigue test load. These collapses are included in reliability but excluded in conventional analysis. The theory of risk determination by each method is given, and several reasonably typical examples have been worked out, in which it transpires that if one excludes collapse through exceedance of the uncracked strength, the reliability and conventional analyses gave virtually identical probabilities of failure or survival.
Hooke, F. H.↗
Definition of defect size from ultrasonic inspection.
Attempt to obtain a set of relationships between testing parameters defining the range of defect size that can be associated with a given echo amplitude and defect depth. These relationships allow the user to find the largest defect that will return a signal equal to that from a flat hole of known diameter and depth, and the signal amplitude ratio between worst case and flat hole defects of equal diameter. The variation of the data with defect and testing parameters is shown. The results are obtained analytically, with laboratory corroboration, by calculation of the echo amplitude of the defect shape yielding the smallest return signal, a sphere, and the echo amplitude of the defect shape yielding the largest return signal, a flat hole.
Bennet, S. B.↗
Detector for inspection of fire alarms
Portable detector tests rate-of-rise temperature devices. Incandescent light bulb is calibrated to produce rate of temperature rise necessary to activate properly functioning alarm.
Clawson, G. T.↗
Improved technique for inspection of planar surfaces by microscopy and interferometry
Incident white light and ordinary interferometer attachment provide images that differ in color according to relative heights of planar surfaces. With aid of technique, it is possible to perceive buried layers, such as diffused collectors, as well as discover defects in buried layers.
Doubt, D. S.↗
X-ray opaque additive for inspection of weld joints
Thin coating of copper applied to each faying surface of aluminum-alloy improve X ray detection of welding defects. Copper may be applied by spraying, coating, or deposition. Its thickness of faying surfaces must be uniform in range. Coating must be free from spalling and blistering and must contain no porosity.
Brown, R. L.↗
The use of ERTS-1 imagery in the national program for the inspection of dams
There are no author-identified significant results in this report.
Anderson, D. M.↗
Correlation of magnetic perturbation inspection data with rolling element bearing fatigue results
A magnetic perturbation technique was used to nondestructively detect subsurface nonmetallic inclusions in the inner races of 207-size, deep groove ball bearings. The bearings were fatigue tested at 2750 rpm under a radial load of. The inner races were subsequently sectioned at fatigue spall locations and at magnetic perturbation signal locations. Analyses of the data indicated good correlation between magnetic perturbation signals and inclusion size and location. Exclusion of those bearings that had significant magnetic perturbation signals did not alter the statistical life of the bearings.
Parker, R. J.↗
Ultrasonic scanning system for in-place inspection of brazed tube joints
A miniaturized ultrasonic scanning system for nondestructive in-place, non-immersion testing of brazed joints in stainless-steel tubing is described. The system is capable of scanning brazed tube joints, with limited clearance access, in 1/4 through 5/8 inch union, tee, elbow and cross configurations. The system has the capability to detect defective conditions now associated with material density changes in addition to those which are depended upon density variations. The system includes a miniaturized scanning head assembly that fits around a tube joint and rotates the transducer around and down the joint in a continuous spiral motion. The C-scan recorder is similar in principle to conventional models except that it was specially designed to track the continuous spiral scan of the tube joint. The scanner and recorder can be operated with most commercially available ultrasonic flaw detectors.
Haynes, J. L.↗