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About: Fastran     Goto   Sponge   NotDistinct   Permalink

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Fastran is a computer program for calculating the rate of fatigue crack growth by combining crack growth equations and a simulation of the plasticity at the crack tip. Fastran models accelerations and retardation and other variable amplitude loading effects in crack growth using a crack closure model. The program uses a strip yield model of the crack tip that was first proposed by D. S. Dugdale to calculate the size of the plastic zone ahead of a crack tip. A series of elastic-perfectly plastic strips (originally 30 strips were used) that model the region both ahead and behind the crack tip is used to keep track of the plasticity produced at the crack tip. As the crack grows, the strips are cut and leave a region of raised plastic material in the crack wake that prevents the complete closu