Accession Number:

ADA329693

Title:

Rolling-Element Fatigue Life of AISI M-50 and 18-4-1 Balls.

Descriptive Note:

Technical paper,

Corporate Author:

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Report Date:

1978-04-01

Pagination or Media Count:

20.0

Abstract:

Rolling-element fatigue studies were conducted with VIM-VAR AISI M-50, EFR 18-4-1, and VAR 18-4-1. Groups of 12.7-mm 12-in. diameter balls of each material were tested in the five-ball fatigue tester. Test conditions included a load of 1540 N 347 lbf giving a maximum Hertz stress of 5520 MPa 800 000 psi, a shaft speed of 10 700 rpm, and a contact angle of 30 deg. Tests were run at a race temperature of 339 K 150 deg F with a type II ester MIL-L-23699 lubricant. The rolling-element fatigue life of VIM-VAR AISI M-50 was not significantly different from that of EFR 18-4-1 or VAR 18-4-1 based on a statistical comparison of the test results.

Subject Categories:

  • Machinery and Tools

Distribution Statement:

APPROVED FOR PUBLIC RELEASE