Accession Number : AD0292938

Title :   FABRICATION OF PROTOTYPE ROCKET MOTOR CASE BY CRYOGENIC STRETCH-FORMING

Corporate Author : ARDE-PORTLAND INC PARAMUS N J

Personal Author(s) : PARIGIAN,C.

Report Date : 30 NOV 1962

Pagination or Media Count : 11

Abstract : Various Sparrow vessel configurations were fabricated and stretched. Two composite belly band vessels were completed. The composite consists of a stretched belly band vessel, to one end of which is welded a mechanically stretched nozzle housing. On one of these vessels, simulated antenna clips were resistance-welded to the cylinder walls. Both vessels were then stretched cryogenically to a pressure of 3000 psi to strengthen the newly welded regions. The vessel to which the nozzle housing and antenna clips were welded was subjected to hydrotest to yield after restretching. The vessel first yielded in the region of the hemispherical head to nozzle housing juncture at a pressure of 2700 psig. This was equivalent to a nominal stress on the thin-walled cylinder of 194,000 psi, which meets the strength level requirement of the motor case design. Two 80% boss belly band vessels were fabricated and cryogenically stretched. These two 80% boss vessels were inspected after stretch, and both vessels were dime sionally acceptable. (Author)

Descriptors :   *ROCKET ENGINE CASES, CRYOGENICS, METAL FORMING PRESSES, PRESSURE VESSELS, STAINLESS STEEL

Distribution Statement : APPROVED FOR PUBLIC RELEASE