Staircase testing of a titanium alloy in the gigacycle regime

M. Jane£ek, F. Nový, P. Harcuba, J. Stráský, L. Tr2ko, M. Mhaede and L. Wagner Charles University in Prague, Department of Physics of Materials, Ke Karlovu 5, CZ-12116, Prague, Czech Republic University of ilina, Department of Materials Engineering, ilina, Slovak Republic Research Center of the University of ilina, ilina, Slovak Republic Clausthal University of Technology, Institute of Materials Science and Technology, Clausthal-Zellerfeld, Germany

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The Very High Cycle Fatigue Behaviour of Ti-6Al-4V Alloy

Modelling of cracking sites/development in axial dovetail joints of aero-engine compressor discs

A comparison of maximum likelihood models for fatigue strength characterization in materials exhibiting a fatigue limit

The influence of dynamic strain aging (DSA) on low cycle fatigue (LCF) in duplex Ti-6-4 and SP700 titanium alloys was studied. LCF was performed within the temperature range from 350 °C to 450 °C, at strain rates of 10−3 s−1 and 10−4 s−1, and strain amplitudes of 1.25% and 2%. DSA appeared as serrations at the plastic portion of the cyclic stress–strain hysteresis loop, as well as stress humps appearing in the cyclic stress response (CSR) curve of peak tensile stress response versus cycle number. Strain-induced micro twin formation was only observed in the sample after fatigue with 2% strain amplitude under a 10−4 s−1 strain rate, indicating that it is a DSA induced phenomenon.

Tae-Won Park

Papers

Effect of predamage from low cycle fatigue on high cycle fatigue strength of Ti-6Al-4V