Effect of Specimen Size on J-Integral and Stress-Intensity Factor at the Onset of Crack Extension

HP Keller; D Munz

doi:10.1520/STP35542S

SYMPOSIA PAPER Published: 01 January 1977

STP35542S

Effect of Specimen Size on J-Integral and Stress-Intensity Factor at the Onset of Crack Extension

Source

For a nickel-chromium-molybdenum steel and the aluminum alloy 7475, linear-elastic fracture mechanics can be applied to determine the stress-intensity factor at the onset of crack extension K_Io for specimens with (W − a)_c>0.4 (K_Io/σ_y)². For smaller specimens, K_Io can be calculated from the J-integral J_Io at the onset of crack extension, whereas linear-elastic fracture mechanics yield values which are too low. Below a minimum thickness B ≤ 50 J_Io/σ_y an increase of J_o was observed.

Author Information

Keller, HP

Deutsche Forschungs-und Versuchsanstalt für Luft-und Raumfahrt, Cologne, Germany

Munz, D

Deutsche Forschungs-und Versuchsanstalt für Luft-und Raumfahrt, Cologne, Germany

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Details

Developed by Committee: E08

Pages: 217–231

DOI: 10.1520/STP35542S

ISBN-EB: 978-0-8031-4703-4

ISBN-13: 978-0-8031-0356-6

Effect of Specimen Size on J-Integral and Stress-Intensity Factor at the Onset of Crack Extension

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