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Fatigue, Fracture, and Reliability Group AFWAL-TM-88-157-FIBE Structural Integrity Branch Wright-Patterson AFB, Ohio 45433 Approved for public release. Distribution is unlimited MODGRO is a PC oriented crack growth analysis computer program. It is based on a program called ASDGRO written by E. Davidson, ASD/ENFSF, WPAFB, OH. The major differences between MODGRO and ASDGRO are:-Acceptance of tabular da/dN data,-Seperate 'user-friendly' input data generator, and-Approximate K solutions for arbitrary geometries. MODGRO is a tool that can analyze many coiznon, as well as some uncommon, crack geometries. MODGRO inputs are normalized to allow the use of any system of units, however, it is up to the user to ensure consistancy.

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