TY - JOUR
T1 - Measurement of stresses by line-focus acoustic microscopy
AU - Lee, Yung Chun
AU - Kim, Jin O.
AU - Achenbach, Jan D.
N1 - Funding Information:
The authors are pleased to acknowledge the help of Mr J.J. Luo for providing the finite element program. This work was carried out in the course of research sponsored by the Department of Energy under Contract DE-FG02-86ER 13484.
PY - 1994/9
Y1 - 1994/9
N2 - In this paper, line-focus acoustic microscopy has been used to determine local near-surface stresses in isotropic materials. Two surface wave modes, namely a leaky Rayleigh wave and a leaky surface-skimming longitudinal wave, have been excited by the acoustic microscope. It has been observed that the changes of the wave velocities are linearly proportional to the applied stresses, as predicted by acoustoelastic theory. The non-uniform stress field in a loaded specimen has been determined from wave velocity measurements by the use of acoustoelastic constants obtained from a calibration test. The measured stresses are in good agreement with the results calculated by a finite element method. A self-calibrating method, which determines the stress profile directly from velocity measurements without a calibration test, is proposed and the results are compared with experimental data.
AB - In this paper, line-focus acoustic microscopy has been used to determine local near-surface stresses in isotropic materials. Two surface wave modes, namely a leaky Rayleigh wave and a leaky surface-skimming longitudinal wave, have been excited by the acoustic microscope. It has been observed that the changes of the wave velocities are linearly proportional to the applied stresses, as predicted by acoustoelastic theory. The non-uniform stress field in a loaded specimen has been determined from wave velocity measurements by the use of acoustoelastic constants obtained from a calibration test. The measured stresses are in good agreement with the results calculated by a finite element method. A self-calibrating method, which determines the stress profile directly from velocity measurements without a calibration test, is proposed and the results are compared with experimental data.
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U2 - 10.1016/0041-624X(94)90105-8
DO - 10.1016/0041-624X(94)90105-8
M3 - Article
AN - SCOPUS:0028494687
VL - 32
SP - 359
EP - 365
JO - Ultrasonics
JF - Ultrasonics
SN - 0041-624X
IS - 5
ER -