Early Fatigue Damage of Magnesium Alloy On-Line Monitoring by Nonlinear Ultrasonic

Abstract:

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.

• Periodical: Advanced Materials Research (Volumes 139-141)
• Pages: 194-197
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.139-141.194
• Online since: October 2010
• Authors: Bing Sheng Yan, Bin Wu, Cun Fu He, Jing Pin Jiao
• Keywords: Fatigue, Magnesium Alloy, Nonlinear Ultrasonic, Online Monitoring

References

[1] G.S. Shui, J.Y. Kim, J.M. Qu, Y.S. Wang and L.J. Jacobs. NDT&E International, Vol. 41 (2008) No. 1, pp.326-329.

[2] J.H. Cantrell and W.T. Yost. Int. J. Fatigue, Vol. 23 (2001), pp.487-490.

[3] P.B. Nagy. Ultrasonics, Vol. 36 (1998) No. 1-5, pp.375-381.

[4] P.M. Jordan. Physics Letters A, Vol. 355 (2006) No. 3, pp.216-221.

[5] K.Y. Jhang and K.C. Kim. Ultrasonics, Vol. 37 (1999) No. 1, pp.39-44.

[6] J.Y. Kim, L.J. Jacobs, J.M. Qu and J.W. Littles. Journal of the Acoustic Society of America, Vol. 120 (2006) No. 3, pp.1266-1273.

[7] D.C. Hurley and C.M. Fortunko. Meas Sci Technol, Vol. 8 (1997) No. 6, pp.634-642.