Ultrasonic linear and nonlinear behavior of fatigued Ti-6Al-4V

The change in ultrasonic nonlinear property of a titanium alloy subjected t o cyclic loading has been studied, with an objective to develop a new chara cterization methodology for quantifying the level of damage in the material undergoing fatigue. In order to determine the degree of nonlinearity, the ultrasonic second harmonic generation technique has been used. The second h armonic signal was monitored during the fatigue process, and a substantial increase in the second harmonic amplitude (180% increase in nonlinear facto r) was observed. This indicates that the second harmonic signal is very sen sitive to the microstructural changes in the material caused by fatigue.