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The objective of the development is to add to the MARC program the feature of crack propagation for progressive material failure. The development is in the form of a block of User Subroutines. The material is assumed to fail when a stress measure, chosen by the user among four options, exceeds the corresponding stress limit (set by the user). The Finite Element mesh is torn along an element side; one side at a time. This way the crack propagates all the way up to body failure, or up to a stop.