Abstract

Abstract : A summary and a bibliography are presented of the investigations on dynamic effects on fracture in elastic and elastic-plastic materials which were carried out at Northwestern University under the sponsorship of the Air Force Office of Scientific Research during the period July 1, 1978 - September 30, 1983. Two main areas are investigated: high rate loads on bodies containing cracks, and fast fracture and crack arrest. Inertial and crack tip plasticity effects are investigated for a stationary crack under rapid loading. Dynamic analysis of fast fracture and crack arrest using a Dugdale model is formulated and numerically solved. Elastodynamic stress intensity factors are investigated for various subsurface crack geometries, including Mode III analytical solutions and approximate mixed Mode I-II solutions. Elastic-viscoelastic fast fracture and crack arrest are studied using Bodner-Partom constitutive modeling. Crack kinking under stress wave loading is analyzed rigorously for Mode III, and mixed Mode I-II is approximated. Originator furnished key words include: Crack propagation, Near tip fields, Elastic plastic behavior, Crack arrest, Crack kinking.

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