Abstract
A dual frequency mixing technique has been developed for measuring velocity changes caused by material nonlinearity. The technique is based on the parametric interaction between two surface acoustic waves (SAWs): The low frequency pump SAW generated by a transducer and the high frequency probe SAW generated and detected using laser ultrasonics. The pump SAW stresses the material under the probe SAW. The stress (typically 5 MPa) is controlled by varying the timing between the pump and probe waves. The nonlinear interaction is measured as a phase modulation of the probe SAW and equated to a velocity change. The velocity-stress relationship is used as a measure of material nonlinearity. Experiments were conducted to observe the pump-probe interaction by changing the pump frequency and compare the nonlinear response of aluminum and fused silica. Experiments showed these two materials had opposite nonlinear responses, consistent with previously published data. The technique could be applied to life-time predictions of engineered components by measuring changes in nonlinear response caused by fatigue.
| Language | English |
|---|---|
| Pages | 1721-1728 |
| Number of pages | 8 |
| Journal | Journal of the Acoustical Society of America |
| Volume | 129 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 30 Apr 2011 |
| Externally published | Yes |
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Keywords
- nondestructive evaluation
- fatigue analysis
- microscale defects
- acoutic waves
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}
Measurement of material nonlinearity using surface acoustic wave parametric interaction and laser ultrasonics. / Stratoudaki, Theodosia; Ellwood, Robert; Sharples, Steve D.; Clark, Matthew; Somekh, Michael G.; Collison, Ian J.
In: Journal of the Acoustical Society of America, Vol. 129, No. 4, 30.04.2011, p. 1721-1728.Research output: Contribution to journal › Article
TY - JOUR
T1 - Measurement of material nonlinearity using surface acoustic wave parametric interaction and laser ultrasonics
AU - Stratoudaki, Theodosia
AU - Ellwood, Robert
AU - Sharples, Steve D.
AU - Clark, Matthew
AU - Somekh, Michael G.
AU - Collison, Ian J.
PY - 2011/4/30
Y1 - 2011/4/30
N2 - A dual frequency mixing technique has been developed for measuring velocity changes caused by material nonlinearity. The technique is based on the parametric interaction between two surface acoustic waves (SAWs): The low frequency pump SAW generated by a transducer and the high frequency probe SAW generated and detected using laser ultrasonics. The pump SAW stresses the material under the probe SAW. The stress (typically 5 MPa) is controlled by varying the timing between the pump and probe waves. The nonlinear interaction is measured as a phase modulation of the probe SAW and equated to a velocity change. The velocity-stress relationship is used as a measure of material nonlinearity. Experiments were conducted to observe the pump-probe interaction by changing the pump frequency and compare the nonlinear response of aluminum and fused silica. Experiments showed these two materials had opposite nonlinear responses, consistent with previously published data. The technique could be applied to life-time predictions of engineered components by measuring changes in nonlinear response caused by fatigue.
AB - A dual frequency mixing technique has been developed for measuring velocity changes caused by material nonlinearity. The technique is based on the parametric interaction between two surface acoustic waves (SAWs): The low frequency pump SAW generated by a transducer and the high frequency probe SAW generated and detected using laser ultrasonics. The pump SAW stresses the material under the probe SAW. The stress (typically 5 MPa) is controlled by varying the timing between the pump and probe waves. The nonlinear interaction is measured as a phase modulation of the probe SAW and equated to a velocity change. The velocity-stress relationship is used as a measure of material nonlinearity. Experiments were conducted to observe the pump-probe interaction by changing the pump frequency and compare the nonlinear response of aluminum and fused silica. Experiments showed these two materials had opposite nonlinear responses, consistent with previously published data. The technique could be applied to life-time predictions of engineered components by measuring changes in nonlinear response caused by fatigue.
KW - nondestructive evaluation
KW - fatigue analysis
KW - microscale defects
KW - acoutic waves
UR - http://www.scopus.com/inward/record.url?scp=79954485332&partnerID=8YFLogxK
U2 - 10.1121/1.3560945
DO - 10.1121/1.3560945
M3 - Article
VL - 129
SP - 1721
EP - 1728
JO - Journal of the Acoustical Society of America
T2 - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
SN - 0001-4966
IS - 4
ER -