STP612

    Description of a Computerized Method for Predicting Thermal Fatigue Life of Metals

    Published: Jan 1976


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    Abstract

    A computer program called TFLIFE which can be used to predict the thermal fatigue life of metals and structural components from conventional metal properties is described. This program is used as a subroutine with a main program supplied by the user. The main program calculates input cycles of temperature and total strain for TFLIFE which then calculates a stress cycle, creep and plastic strain damage, and cyclic life. A unique feature of TFLIFE is that it calculates lives according to several different failure criteria for the same input data. These criteria are surface crack initiation, interior crack initiation, and complete fracture of both unnotched and notched fatigue specimens. Sample output tables are shown, together with results for two typical problems: (a) thermal-mechanical fatigue of bar specimens of the tantalum alloy T-111 and (b) thermal-stress fatigue of wedge specimens of the nickel alloy B-1900. Thermal fatigue lives calculated using TFLIFE have been verified by comparison with a variety of laboratory test data on different types of alloys. The computer program is now ready for more extensive evaluation on structural components as well as additional laboratory specimens.

    Keywords:

    thermal fatigue, fatigue (metals), crack initiation, computer programs, thermal stress, life prediction, creep


    Author Information:

    Spera, DA
    Consultant, Fatigue Branch, and mathematician, Computer Services Division, Lewis Research Center, Cleveland, Ohio

    Cox, EC
    Consultant, Fatigue Branch, and mathematician, Computer Services Division, Lewis Research Center, Cleveland, Ohio


    Paper ID: STP27885S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP27885S


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