Engineering topics

Schimmel, Morry L.

Publications and source records attributed to Schimmel, Morry L..

21 records · Page 2

NASA NTRS1989

Ignitability test method

To overcome serious weaknesses in determining the performance of initiating devices, a novel 'ignitability test method', representing actual design interfaces and ignition materials, has been developed. Ignition device output consists of heat, light, gas an burning particles. Past research methods have evaluated these parameters individually. This paper describes the development and demonstration of an ignitability test method combining all these parameters, and the quantitative assessment of the ignition performance of two widely used percussion primers, the M42C1-PA101 and the M42C2-793. The ignition materials used for this evaluation were several powder, granule and pellet sizes of black powder and boron-potassium nitrate. This test method should be useful for performance evaluation of all initiator types, quality assurance, evaluation of ignition interfaces, and service life studies of initiators and ignition materials.

Bement, Laurence J.↗

NASA NTRS1988

Investigation of Super*Zip separation joint

An investigation to determine the most likely cause of two failures of five tests on 79 inch diameter Lockheed Super*Zip spacecraft separation joints being used for the development of a Shuttle/Centaur propulsion system. This joint utilizes an explosively expanded tube to fracture surrounding prenotched aluminum plates to achieve planar separation. A test method was developed and more than 300 tests firings were made to provide an understanding of severance mechanisms and the functional performance effects of system variables. An approach for defining functional margin was developed, and specific recommendations were made for improving existing and future systems.

Bement, Laurence J.↗

NASA NTRS1987

Super-Zip separation joint performance investigation

Following functional failures of two of five Lockheed Super-Zip spacecraft separation joints in a development test series to quantify thermal effects, an investigation program was initiated on this and related systems to assist in preventing recurrence. The Super-Zip joint, applied in a ring configuration, utilizes an explosively expanded tube to fracture surrounding prenotched aluminum plates to achieve planar separation. A unique test method was developed and more than 300 individual test firings were conducted to provide an understanding of severance mechanisms, the functional performance effects of system variables, and the most likely cause of system failure. An approach for defining functional margin was developed, as well as specific recommendations for improving existing and future systems.

Bement, Laurence J.↗