Engineering topics

Shadoan, Mike

Publications and source records attributed to Shadoan, Mike.

4 records

NASA NTRS2003

Development of a Novel Discontinuously Reinforced Aluminum for Space Applications

The present results indicated that: Al-Sc-Mg-X alloys were selected to provide higher strength from -423 to 450F. SiC and B4C were chosen as reinforcements. Fine spherical powder of Al-Sc-Mg-X was produced using helium gas atomization. Matrix alloy and DRA were processed using vacuum hot processing and extrusion. DRA showed very high strength 100ksi at cryo, RT and hydrogen. Ductility was low. Matrix alloy exhibited high strength and ductility. LCF of matrix was higher than DRA in high strain range.

Pandey, Awadh↗

NASA NTRS2003

Selection and Evaluation of An Alloy for Nozzle Application

The goal was to select and characterize a material with superior weldability and hydrogen resistance for nozzle application under Second Generation Reusable Launch Vehicle (2GRLV) program funded by NASA_MSFC. Currently standard A-286 is used for SSME nozzle.Howewer, material with superior weldability and hydrogen resistance will be desired for (2GRLV).

Pandey, Awadh↗

NASA NTRS1995

Knee Brace Would Lock And Unlock Automatically

Proposed knee brace designed to aid rehabilitation of person who suffered some muscle damage in leg. Not limited to locking in straight-leg position and, instead, locks at any bend angle. Does not prevent knee from bearing weight. Instead, knee brace allows knee to bear weight and locks only when foot and lower leg bear weight. Thus, brace prevents flexion that wearer desired to prevent but could not prevent because of weakened muscles. Knee bends freely to exercise knee-related muscles. Knee brace strapped at upper end to leg above knee, and anchored at lower end by stirrup under foot. Joint mechanism (identical mechanisms used in left and right assemblies) allows knee joint to flex freely except when weight applied to heel.

Myers, Neill↗

NASA NTRS1994

Selectively lockable knee brace

A knee brace for aiding in rehabilitation of damaged leg muscles includes upper and lower housings, normally pivotable, one relative to the other about the knee joint axis of a patient. The upper housing is attachable to the thigh of the patient above the knee joint, while the lower housing is secured to a stirrup which extends downwardly along the patient's leg and is attached to the patient's shoe. An actuation rod is carried within the lower housing and is coupled to a cable. The upper and lower housings carry cooperative clutch/brake elements which normally are disengaged to permit relative movement between the upper and lower housings. When the cable is extended, the clutch/brake elements engage and lock the housings together. A heel strike mechanism fastened to the stirrup and the heel of the shoe is connected to the cable to selectively extend the cable and lock the brace in substantially any position when the patient places weight on the heel.

Myers, Neill↗