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Hagemaier, D. J.

Publications and source records attributed to Hagemaier, D. J..

6 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1978

NDT of DC-10 graphite-epoxy rudder

The results of visual and ultrasonic nondestructive tests (NDT) on a DC-10 rudder constructed of Thornel 300/5208 graphite-epoxy are presented. A viscous couplant was used for both contact pulse-echo ultrasonics and the Fokker bondtester. Attention is given to the stiffness of cohesive bond structures (the rudder is assembled primarily in a basic six-ply pattern), and to possible delamination. A piezoelectric transducer is employed to sense changes in impedance and signal amplitude. In all, four rudder units were evaluated. The main problems found in the units were porosity and cracking. It is noted that rudder unit four was able to be sufficiently cured to permit static tests on all rib, spar, and skin panel interfaces.

Hagemaier, D. J.↗
NASA NTRS1969

Nondestructive testing of welds on thin-walled tubing

Special ultrasonic search unit, or transducer assembly, reliably inspects the quality of melt-through welds of fusion welded tubing couplers for hydraulic lines. This instrumentation can also be used to detect faulty braze bonds in thin-walled, small diameter joints and wall thickness of thin-walled metal tubing.

Hagemaier, D. J.↗
NASA NTRS1968

Nondestructive testing of brazed rocket engine components

Report details study made of nondestructive radiographic, ultrasonic, thermographic, and leak test methods used to inspect and evaluate the quality of the various brazed joints in liquid-propellant rocket engine components and assemblies. Descriptions of some of the unique equipment and methods developed are included.

Adams, C. J.↗