CRACK GROWTH

Predictions of fatigue crack growth behavior can be made with the Fatigue
Crack Growth Structural Analysis (FASTRAN II) computer program from NASA
Langley Research Center. As cyclic loads are applied to a selected crack
configuration with an initial crack size, FASTRAN II predicts crack growth
as a function of cyclic load history until either a desired crack size is
reached or failure occurs. FASTRAN II is based on plasticity-induced
crack-closure behavior of cracks in metallic materials and accounts for
load-interaction effects, such as retardation and acceleration, under
variable-amplitude loading. The closure model is based on the Dugdale
model with modifications to allow plastically deformed material to be left
along the crack surfaces as the crack grows. Plane stress and plane strain
conditions, as well as conditions between these two, can be simulated in
FASTRAN II by using a constraint factor on tensile yielding at the crack
front to approximately account for three-dimensional stress states.
FASTRAN II contains seventeen predefined crack configurations (standard
laboratory fatigue crack growth rate specimens and many common crack
configurations found in structures); and the user can define one
additional crack configuration.

FASTRAN II is written in standard FORTRAN 77. It has been successfully
compiled and implemented on Sun4 series computers running SunOS and on IBM
PC compatibles running MS-DOS using the Lahey F77L FORTRAN compiler.
Sample input and output data are included with the FASTRAN II package. The
UNIX version requires 660K of RAM for execution. The standard distribution
medium for the UNIX version (LAR-14865) is a .25 inch streaming magnetic
tape cartridge in UNIX tar format. It is also available on a 3.5 inch
diskette in UNIX tar format. The standard distribution medium for the
MS-DOS version (LAR-14944) is a 5.25 inch 360K MSDOS format diskette. The
contents of the diskette are compressed using the PKWARE archiving tools.
The utility to unarchive the files, PKUNZIP.EXE, is included. Program
$1,000; documentation $26.

COSMIC
The University of Georgia
382 East Broad St, Athens, GA 30602-4272
706-542-3265,  FAX: 706-542-4807

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