Date of Award
1991
Document Type
Thesis
Publication Status
Version of Record
Submission Date
October 2026
Thesis/Dissertation Advisor [Chair]
Salivar, Gary C.
Abstract
This research investigated the effects of stress ratio, temperature and microstructure on the near-threshold fatigue crack growth characteristics of three differently processed titanium alloys. The materials investigated included one hot-worked Ti-6Al-2Sn-4Zr-2Mo alloy, one cast Ti-6Al-4V alloy and one cast Ti-6Al-2Sn-4Zr-2Mo alloy. It was found that overall crack closure could account for apparent differences in fatigue threshold for stress ratios up to about 0.7. Tests run at stress ratios of 0.9, however, showed a noticeably lower fatigue threshold. Crack closure was not able to account for differences due to elevated temperature. Fractographic evidence is also presented which shows the extremely beneficial effects of larger grain size on the fatigue threshold through crack branching, deflection and bifurcation.
Extent
170 p.
Recommended Citation
Dauven, Joseph R., "Stress ratio, temperature and microstructural effects on the fatigue crack propagation threshold of titanium alloys" (1991). Electronic Theses and Dissertations 1990 - 1999. 237.
https://digitalcommons.fau.edu/etd_general_4/237
Identifier
FADT14772
Comments
College of Engineering and Computer Science|FAU Electronic Theses and Dissertations Collection|Thesis (M.S.E.)--Florida Atlantic University, 1991.|College of Engineering and Computer Science