SYMPOSIA PAPER Published: 01 January 1988
STP23276S

Development of the NASA/FLAGRO Computer Program

Source

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.

Author Information

Forman, RG
NASA, Houston, TX
Shivakumar, V
Lockheed-EMSCO, Houston, TX
Newman, JC
NASA, Hampton, VA
Piotrowski, SM
Lockheed-EMSCO, Houston, TX
Williams, LC
Lockheed-EMSCO, Houston, TX
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Details
Developed by Committee: E08
Pages: 781–803
DOI: 10.1520/STP23276S
ISBN-EB: 978-0-8031-5036-2
ISBN-13: 978-0-8031-0949-0