Fracture Energy of Propagating Cracks in Rock.
Bruchenergie laufender Risse in Gestein - Besonderheiten des Bruchausbreitungsverhaltens sprödbrechender Gesteine
Andreas Bertram und Jörg F. Kalthoff
ABSTRACT Crack propagation events are initiated in Solnhofen limestone under impact loading conditions. Fracture energy respectively fracture toughness and velocity of the propagating cracks are measured by means of an optimized strain gauge measuring technique. Cracks are accelerated to velocities in the range of 1500 m/s. The measured crack propagation energies/crack propagation toughnesses are significantly higher than the crack initiation energy/crack initiation toughness. Control measurements on the basis of a global energy approach by means of Charpy pendulum impact tests verify the found behaviour. The results explain characteristic peculiarities of the crack propagation behaviour of brittle fracture in rock.
Publication Source: Materialprüfung, ISSN: 0025-5300
Issue: 2003-3, pp 100-104
Publisher: Carl Hanser Verlag München
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