NDLI: Effect of impact damage on the fatigue response of tial alloy-abb-2

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Effect of impact damage on the fatigue response of tial alloy-abb-2

Content Provider	NASA Technical Reports Server (NTRS)
Author	Staubli, M. Nazmy, M. Y. Draper, S. L. Clemens, D. R. Pereira, J. M. Lerch, B. A. Nathal, M. V.
Copyright Year	2001
Description	The ability of gamma-TiAl to withstand potential foreign or domestic object damage is a technical risk to the implementation of gamma-TiAl in low pressure turbine (LPT) blade applications. In the present study, the impact resistance of TiAl alloy ABB-2 was determined and compared to the impact resistance of Ti(48)Al(2)Nb(2)Cr. Specimens were impacted with four different impact conditions with impact energies ranging from 0.22 to 6.09 J. After impacting, the impact damage was characterized by crack lengths on both the front and backside of the impact. Due to the flat nature of gamma-TiAl's S-N (stress vs. cycles to failure) curve, step fatigue tests were used to determine the fatigue strength after impacting. Impact damage increased with increasing impact energy and led to a reduction in the fatigue strength of the alloy. For similar crack lengths, the fatigue strength of impacted ABB-2 was similar to the fatigue strength of impacted Ti(48)Al(2)Nb(2)Cr, even though the tensile properties of the two alloys are significantly different. Similar to Ti(48)Al(2)Nb(2)Cr, ABB-2 showed a classical mean stress dependence on fatigue strength. The fatigue strength of impacted ABB-2 could be accurately predicted using a threshold analysis.
File Size	1378635
Page Count	8
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20020031244
Archival Resource Key	ark:/13960/t7mq00842
Language	English
Publisher Date	2001-01-01
Access Restriction	Open
Subject Keyword	Metals And Metallic Materials Fatigue Tests Turbine Blades Fatigue Materials Impact Resistance Titanium Aluminides Impact Damage Crack Propagation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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