Early Fatigue Damage of Magnesium Alloy On-Line Monitoring by Nonlinear Ultrasonic
This research develops a robust experimental procedure to monitor the evolution of early fatigue damage in AZ31 magnesium alloy with the acoustic nonlinearity parameter , and demons- trats its reliability by measuring the linear relationship between amplitudes of the second-harmonic waves and fundamental waves squared. Using this system, of two sets of specimens with different stress level is measured. The experimental results show that there is a significant increase in linked to fatigue degree in the early stages of fatigue life and reaches the maximum about 55%of fatigue life, when the stress level is ±60%of the yield stress, can characterize the early fatigue damage of magnesium alloy. However, when the stress level is ±70%of the yield stress, there is a regular fluctuation in linked to fatigue degree, this experimental results can’t be explained.
Liangchi Zhang, Chunliang Zhang and Tielin Shi
B. S. Yan et al., "Early Fatigue Damage of Magnesium Alloy On-Line Monitoring by Nonlinear Ultrasonic", Advanced Materials Research, Vols. 139-141, pp. 194-197, 2010