SYMPOSIA PAPER Published: 01 January 1976
STP33371S

Experimental Results and a Hypothesis for Fatigue Crack Propagation Under Variable-Amplitude Loading

Source

Many as yet inadequately-understood phenomena contribute to the sequence effects observed during fatigue crack propagation under variable-amplitude loading. In order to get an insight in the sequence effects, an extensive test program with 2024-T3 aluminum and Ti-6Al-4V sheet specimens with systematic variations in the loading conditions was performed, where special emphasis was placed on the accurate measurement of the crack propagation just after changes in the loading conditions. A hypothesis is proposed which explains the observed behavior. The hypothesis is based on deformation considerations within the plastic zones caused by the propagating crack.

Author Information

Jacoby, GH
Carl Schenck AG, Darmstadt, West Germany
Nowack, H
Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt (DFVLR), Institut für Werkstoff-Forschung, Porz, West Germany
van Lipzig, HTM
Deutsche Forschungs- und Versuchsanstalt für Luft- und Raumfahrt (DFVLR), Institut für Werkstoff-Forschung, Porz, West Germany
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Details
Developed by Committee: E08
Pages: 172–183
DOI: 10.1520/STP33371S
ISBN-EB: 978-0-8031-4672-3
ISBN-13: 978-0-8031-0344-3