Accession Number : ADA259345


Title :   The Effects of Surface Treatment on Torsional Fatigue Failure in Recoil Springs


Descriptive Note : Final rept.,


Corporate Author : ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS


Personal Author(s) : Fujczak, R R ; Kapp, J A ; Nolan, C J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259345.pdf


Report Date : Oct 1992


Pagination or Media Count : 31


Abstract : Two different steels, AISI 4150H and maraging 250, were tested in torsional fatigue to failure. Both materials were prepared with three surface conditions: (1) as-machined (machining grooves left on the outside surface); (2) as-polished; and (3) polished and shot peened. All specimens converge at low cycle life (about 1,000 cycles), but at lower torsional stresses, the greatest improvement in fatigue life is shown by the shot peened specimens, followed by the as-polished specimens. This is true for both materials. The 4150H steel shows the greatest fatigue lives on the torsional S-N curves, but the maraging 250 displays the greatest degree of improvement throughout the range of surface conditions.


Descriptors :   *STEEL , *FATIGUE(MECHANICS) , *TORSION , *SPRINGS , STRESSES , FATIGUE LIFE , RECOIL , SHOT PEENING , MARAGING STEELS , CYCLIC LOADS , FATIGUE TESTS(MECHANICS) , FAILURE(MECHANICS) , SURFACE PROPERTIES , SURFACES , MACHINING


Subject Categories : Metallurgy and Metallography
      Machinery and Tools
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE