On the use of the √area△ and the three-parameter power function to
estimate fatigue life of TC17 titanium alloy
Abstract
This paper examined the ability of √area△ using the material
fatigue-life curves in estimating high-cycle fatigue life considering
micro scratch. Ultrasonic fatigue tensile experiment were reported in
determining the fatigue life model for micro scratches, where fatigue
failure of all the specimens occurred from surface in the lab study. A
high cycle fatigue (HCF) life model of TC17 based on micro scratches is
established with the synthesis of surface condition fatigue strength
modified by √area△ and the three-parameter power function. Reasonable
agreements are observed between the model predictions and the
experimental values. What is more, according to the application of
√area△ from current papers, it can be suggested that the proposed √area△
is suitable for being used in fatigue strength and fatigue life
analysis.