Mean stress (tensile) effects on fatigue crack growth behavior of some structural titanium alloys: An overview of microstructural issues

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20013308

Ravichandran, K S; Jha, S K

An overview of the effect mean stress or stress ratio (R) of the fatigue cycle, on fatigue crack growth responses of some structural titanium alloys is performed. The fatigue crack growth data generated by the authors on some alloys, are considered in combination with the data of other alloys reported in literature. The alloys include those that are commercially used as well as some model alloys that were either employed in academic studies or were under development in the past. It has been found that the mean stress dependence in titanium alloys is brought about by two different mechanisms, namely, crack closure at low {Delta}K levels and static-mode-cracking contribution at high {Delta}K levels. It was observed that in general, a decrease in the tensile ductility of the alloy causes an increase in the sensitivity of fatigue crack growth rates to the mean stress. The microstructural and deformation characteristics that are responsible for this behavior are highlighted.

• Research Organization: Univ. of Utah, Salt Lake City, UT (US)
• OSTI ID: 20013308
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACK PROPAGATION
DEFORMATION
EXPERIMENTAL DATA
FATIGUE
MICROSTRUCTURE
STRESSES
TENSILE PROPERTIES
TITANIUM BASE ALLOYS