STP761

    Application of an Improved Crack Growth Prediction Methodology on Structure Preliminary Design

    Published: Jan 1982


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    Abstract

    An improved crack growth methodology which accounts for load interaction effects was implemented into a computer module, PREGRO, and was subsequently incorporated into an existing preliminary design analysis computer program, APAS. The procedure utilizes the equivalent damage concept, which converts the random spectrum into equivalent constant-amplitude load cycles. By using this improved crack growth prediction module, unnecessary weight penalties can be avoided in the preliminary design of primary structures. Examples are given for the application of this predictive method to wing structures for typical fighter and transport aircraft.

    Keywords:

    crack growth prediction, load interaction effect, preliminary design


    Author Information:

    Chang, JB
    Program Manager/Technical Staff, and Technical Staff, Rockwell International, Los Angeles, Calif.

    Engle, RM
    Aerospace Engineer, Air Force Wright Aeronautical Laboratory, Wright-Patterson Air Force Base, Ohio

    Hiyama, RM
    Program Manager/Technical Staff, and Technical Staff, Rockwell International, Los Angeles, Calif.


    Paper ID: STP28864S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP28864S


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