STP945

    Development of the NASA/FLAGRO Computer Program

    Published: Jan 1988


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    Abstract

    A preliminary version of a new computer program has been developed for calculating crack propagation in cyclically loaded structures. The new program, titled NASA/FLAGRO, has numerous enhanced features over previous programs used for safe life analysis on space systems. The essential features of the new program consist of modular design, promptive input using a cathode ray tube terminal, improved crack growth rate analytical methods, many new crack case solutions, and incorporation of user-defined files for material properties and fatigue spectrums. Also, five options made available in the program are to compute (1) safe life of a part with a preexisting crack, (2) critical crack size for a specified stress level, (3) stress-intensity factor numerical values for making comparisons or checks of solutions, (4) least-squares fit of growth rate equations to crack growth rate data, and (5) to convert a versus N data to ΔK versus da/dN.

    Keywords:

    cracks, crack propagation, fracture mechanics, damage tolerance, fatigue (materials)


    Author Information:

    Forman, RG
    Materials engineer, NASA, Houston, TX

    Shivakumar, V
    Advanced systems engineering specialist, computer programmer, and scientific programming specialist, Lockheed-EMSCO, Houston, TX

    Newman, JC
    Senior scientist, NASA, Hampton, VA

    Piotrowski, SM
    Advanced systems engineering specialist, computer programmer, and scientific programming specialist, Lockheed-EMSCO, Houston, TX

    Williams, LC
    Advanced systems engineering specialist, computer programmer, and scientific programming specialist, Lockheed-EMSCO, Houston, TX


    Paper ID: STP23276S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP23276S


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