SYMPOSIA PAPER Published: 01 January 1980
STP27442S

Influence of Specimen Geometry on Crack Propagation and Arrest Toughness

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A number of crack propagation experiments on four different specimen geometries were performed in order to investigate the existence of a unique relationship between crack propagation toughness and crack-tip velocity. For one geometry, dynamic finite-element method (FEM) calculations were found to be necessary in order to obtain proper stress-intensity factors, whereas quasi-static FEM-calculations were found to be sufficient for the other geometries. Crack-tip velocities were determined from continuous recordings of crack length versus time, which was measured by an impedance method. The stress-intensity factor and the instantaneous crack-tip velocity were obtained for a number of crack lengths for each experiment. The experimental results do not contradict the hypothesis of a unique relationship between these two quantities at low load levels; neither do they contradict the hypothesis of a geometry-independent crack arrest toughness. At high load levels a deviation from the uniqueness was observed. The height of the specimens was found to influence the crack propagation toughness level at the beginning of deviation from the unique relationship.

Author Information

Dahlberg, L
The Royal Institute of Technology, Stockholm, Sweden
Nilsson, F
The Royal Institute of Technology, Stockholm, Sweden
Brickstad, B
The Royal Institute of Technology, Stockholm, Sweden
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Details
Developed by Committee: E08
Pages: 89–108
DOI: 10.1520/STP27442S
ISBN-EB: 978-0-8031-4779-9
ISBN-13: 978-0-8031-0317-7