Development of the NASA/FLAGRO computer programA 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) the conversion of a versus N data to Delta K versus da/dN.
Document ID
19880059778
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Forman, Royce G. (NASA Johnson Space Center Houston, TX, United States)
Shivakumar, Vankataraman (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Piotrowski, Susan M. (NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Williams, Leonard C. (Lockheed Engineering and Management Services Co., Inc. Houston, TX, United States)
Newman, James C., Jr. (NASA Langley Research Center Hampton, VA, United States)