Determination of Crack Opening Load by Use of Threshold Behavior

H Döker; V Bachmann

doi:10.1520/STP27213S

SYMPOSIA PAPER Published: 01 January 1988

STP27213S

Determination of Crack Opening Load by Use of Threshold Behavior

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The effective stress intensity factor range ΔK_eff of a Ti-6Al-4V alloy has been determined by using the threshold behavior of this material. The ΔK_eff values thus determined are in complete agreement with the materials constant amplitude crack growth behavior. ΔK_eff values determined from the opening load obtained by crack opening displacement (COD) and by back-face strain (BFS) are not consistent with the ΔK_eff 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 ΔK_eff, 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

Determination of Crack Opening Load by Use of Threshold Behavior

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