SYMPOSIA PAPER Published: 01 January 1988
STP27213S

Determination of Crack Opening Load by Use of Threshold Behavior

Source

The effective stress intensity factor range ΔKeff of a Ti-6Al-4V alloy has been determined by using the threshold behavior of this material. The ΔKeff values thus determined are in complete agreement with the materials constant amplitude crack growth behavior. ΔKeff values determined from the opening load obtained by crack opening displacement (COD) and by back-face strain (BFS) are not consistent with the ΔKeff values obtained via threshold and cannot explain certain load sequence effects. This leads to the conclusion that COD and BFS measurements are unsuitable for the determination of ΔKeff, at least for this titanium alloy.

Author Information

Döker, H
Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrtt (DFVLR), Köln, Federal Republic of Germany
Bachmann, V
Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrtt (DFVLR), Köln, Federal Republic of Germany
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Details
Developed by Committee: E08
Pages: 247–259
DOI: 10.1520/STP27213S
ISBN-EB: 978-0-8031-5052-2
ISBN-13: 978-0-8031-0996-4