SYMPOSIA PAPER Published: 01 January 2000

Fatigue Crack Propagation and Load Interaction Effects in a Titanium Alloy


An experimental investigation of load interaction effects in Ti-6Al-2Sn-4Zn-2Mo is presented. Simple variable amplitude loading spectra were applied to test samples, and the crack propagation stress intensity factor, KPR, was subsequently measured. The data were condensed to two equations (“master curves”) that describe the influence of an unloading cycle after constant amplitude loading and a single overload cycle, respectively. The results suggest that load interaction effects are caused by residual compressive stresses ahead of the crack front, whereas the influence of crack closure is minor.

Author Information

Lang, M
IABG, Ottobrunn, OH, Germany
Larsen, JM
Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, OH
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Developed by Committee: E08
Pages: 201–213
DOI: 10.1520/STP13404S
ISBN-EB: 978-0-8031-5418-6
ISBN-13: 978-0-8031-2617-6