Browse > Article
http://dx.doi.org/10.3795/KSME-A.2010.34.6.751

Study of Ultrasonic Nonlinearity in Heat-Treated Material  

Li, Weibin (School of Mechanical Engineering, Pusan Nat'l Univ.)
Lee, Jae-Sun (School of Mechanical Engineering, Pusan Nat'l Univ.)
Cho, Youn-Ho (School of Mechanical Engineering, Pusan Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.34, no.6, 2010 , pp. 751-756 More about this Journal
Abstract
Ultrasonic nonlinearity is very sensitive to changes in material properties. This paper describes the study of the correlation between heat treatment and ultrasonic nonlinearity by taking nonlinear factors into consideration. A modified formula was proposed for ultrasonic velocity. This formula indicated that the changes occurring in nonlinearity during heat treatments cause changes in the ultrasonic velocity. The experimental results show that the relative nonlinearity parameters calculated from the modified ultrasonic velocities and the ratio of amplitudes of the second harmonic and fundamental wave are in good agreement. The experimental results prove that heat treatment can result in changes in material nonlinearity. Moreover, the relative nonlinearity parameter calculated from the modified velocity formula is has a large value. Since this parameter has high sensitivity to changes in nonlinearity, it can be used to represent the relative nonlinearity change calculated in this study by using the modified formula for ultrasonic velocity.
Keywords
Ultrasonic Nonlinearity; Heat Treatment; Internal Stress; Dislocation;
Citations & Related Records

Times Cited By SCOPUS : 2
연도 인용수 순위
  • Reference
1 Wallace, D. C., 1967, "Thermoelasticity of Stressed Materials and Comparison of Various Elastic Constants," Physical Review, Vol. 162, No. 3, pp. 776-789.   DOI
2 Yost, W. T. and Breazeale, M. A., 1973, "Ultrasonic Nonlinearity Parameters And Third-Order Elastic Constants Of Germanium Between 300 and $77^{\circ}K$," Physical Review, Vol. 9, No. 2, pp. 510-516.
3 Yost, W. T. and Cantrell, J.H, 1990, "Material Characterization Using Acoustic Nonlinearity Parameters And Harmonic Generation, Engineering Materials," Review of progress in Quantitative Nondestructive Evaluation, Vol. 11b, No. 28, pp. 1669-1692
4 Joseph, S.H. and Engmin, J.C., 1981, "Characterization of Heat Treatment In Aluminum Based On Ultrasonic Determination Of The Second And Third Order Elastic Constants," IEEE Ultrasonic symposium, PP. 936-939
5 Norris, A.N., 1998, "Finite-Amplitude Waves In Solids, in Nonlinear Acoustics," Academic press, New York, pp. 267-269
6 Meyendorf, N. G., Nagy, P.B. and Rockhlin, S.I., 2004, "Nondestructive Materials Characterization," Springer Press, New York, pp. 206-232