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Three problems of constant-speed fast fracture have been simulated by finite-element analyses. The mechanism for the release of mechanical energy was the gradual relaxation of the restraining reaction at a node adjacent to the crack tip. The numerical results are used to compare the performances of two recently proposed methods for prescribing the manner in which the relaxing force depends upon the crack-tip location between nodes in the finite-element model. Energy-release rates generated from the algorithm proposed by Rydholm et al are found to be in slightly better accord with continuum elastodynamics than are those produced by the algorithm previously proposed by the authors.
crack propagation, fast fracture, finite elements, energy dissipation
Senior aircraft structures engineer, Aeronautical Research Department, Lockheed-Georgia Co., Marietta, Ga
Professorconsultant, School of Engineering Science and Mechanics, Georgia Institute of TechnologyLockheed-Georgia Co., AtlantaMarietta, Ga.Ga