Measurements of elastohydrodynamic film thickness, wear and tempering behavior of high pressure oxygen turbopump bearings

The reusable design of the Space Shuttle requires a target life of 7.5 hours for the turbopumps of the Space Shuttle main engine (SSME). This large increase from the few hundred seconds required in single-use rockets has caused various problems with the bearings of the turbopumps. The berings of the high pressure oxygen turbopump (HPOTP) were of particular concern because of wear, spalling, and cage failures at service time well below the required 7.5 hours. Lubrication and wear data were developed for the bearings. Since the HPOTP bearings operate in liquid oxygen, conventional liquid lubricants cannot be applied. Therefore, solid lubricant coatings and lubricant transfer from the polytetrafluorethylene (FTFE) cage were the primary lubrication approaches for the bearings. Measurements were made using liquid nitrogen in a rolling disk machine to determine whether usable elastohydrodynamic films could be generated to assist in the bearing lubrication

Creep strength of boral sheet at 200, 400, 600 F /

"November 23, 1953."Work performed by the Battelle Memorial InstituteMode of access: Internet

Creep-rupture properties of 6061-T6 aluminum alloy at 450 and 500 F /

The creep-rupture characteristics were determined for commercial 6061-T6 (61S-T6) aluminum alloy at 450 and 500 F. The results are presented as design and creep-rate curves. Stress-rupture strengths at 450 F were 17,000, 13,000, and 9,000 (estimated) psi for rupture in 10, 100, and 1000 hr, respectively. At 500 F, stress-rupture strengths were 10,500, 9,100, and 7,200 (estimated) psi for rupture in 10, 100, and 1000 hr, respectively."December 20, 1954.""BMI-970."Cover title.The creep-rupture characteristics were determined for commercial 6061-T6 (61S-T6) aluminum alloy at 450 and 500 F. The results are presented as design and creep-rate curves. Stress-rupture strengths at 450 F were 17,000, 13,000, and 9,000 (estimated) psi for rupture in 10, 100, and 1000 hr, respectively. At 500 F, stress-rupture strengths were 10,500, 9,100, and 7,200 (estimated) psi for rupture in 10, 100, and 1000 hr, respectively.Work performed by the Battelle Memorial InstituteMode of access: Internet

Creep of 4S-O, J51S, and number 22 brazing-sheet aluminum alloys at 300 F /

"January 9, 1953."Work performed by the Battelle Memorial InstituteMode of access: Internet