عنوان

Stress ratio, elevated temperature and microstructural effects on the near-threshold fatigue behavior of titanium alloys

Number

TLpq230625580

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Stress ratio, elevated temperature and microstructural effects on the near-threshold fatigue behavior of titanium alloys

General Material Designation

[Thesis]

First Statement of Responsibility

K. L. Hunter

Subsequent Statement of Responsibility

G. C. Salivar

Name of Publisher, Distributor, etc.

Florida Atlantic University

Date of Publication, Distribution, etc.

1993

Specific Material Designation and Extent of Item

130

Dissertation or thesis details and type of degree

M.S.E.

Body granting the degree

Florida Atlantic University

Text preceding or following the note

1993

Text of Note

The effect of stress ratio, elevated temperature and differences in microstructure on the near-threshold fatigue crack growth behavior of Titanium alloys was investigated. Near-threshold fatigue testing was conducted on Ti-6Al-2Sn-4Zr-2Mo and Ti-6Al-2Sn-4Zr-6Mo at stress ratios of 0.1 and 0.5 and at temperatures of 400F and 800F. It was found that an increase in stress ratio resulted in an increase in growth rates and a decrease in the fatigue threshold. Increasing the temperature also resulted in faster growth rates and a lower threshold. There was slight differences in growth rates between the two alloys due to microstructural differences. Crack closure could effectively remove some of the effects of stress ratio and microstructural differences but could not remove the effect of the higher temperature. Fractographs revealed the difference in microstructure but did not show significant changes in fracture modes between temperatures.

Applied sciences

Mechanical engineering

G. C. Salivar

K. L. Hunter

Electronic name

p

[Thesis]

276903

a

Y