STP556: Flexural Fatigue Testing of Titanium Forging Material in Liquid Hydrogen

    Adsit, NR
    Senior engineering metallurgist and design specialist, General Dynamics Corp., San Diego, Calif.

    Dessau, P
    Chief metallurgist, AIRCO Viking, Verdi, Nev.

    Witzell, WE
    Senior engineering metallurgist and design specialist, General Dynamics Corp., San Diego, Calif.

    Pages: 11    Published: Jan 1974


    Abstract

    The program described is the fatigue testing of titanium 5Al-2.5Sn material cut from production forgings. The high-cycle fatigue testing was carried out in a liquid hydrogen environment. Forging from two different mills were used, and these were tested in various directions.

    A cantilever beam type specimen tapered to provide constant stress across the length was used throughout this program. A special cryostat was made and adapted to standard fatigue testing machines.

    There was a sizeable amount of scatter in the data, but 50 percent survival curves were constructed. There was no evidence of directionality, but there was a large difference between materials. This difference may be explained by the metallurgical structure.

    Keywords:

    fracture properties, fatigue tests, liquid hydrogen, forgings, metallographic structures, titanium, cantilever beams, stresses, cryogenics


    Paper ID: STP33122S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP33122S


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