Performance Comparison of Two LCR Probes Using a Reference Frame

Bray, Don E.
March 2006
AIP Conference Proceedings;2006, Vol. 820 Issue 1, p1442
Academic Journal
Ultrasonic stress evaluation using the LCR technique has shown good results in both laboratory and field demonstrations. Applications, however, have been limited to applied uniaxial stress fields where a known zero stress condition exists. This is due to the uniaxial nature of the LCR wave. An attempt was made to build a static, residual stress calibration frame with known zero stress conditions as well as a predictable uniaxial stress field. The stress conditions were complex, and non-uniform stresses occurred in some of the members. Further, the stress field that resulted was not the same on each side, as had been anticipated. Instead, apparent buckling of the center member of the frame created a stress differential for the two sides. These unexpected stress conditions did yield an opportunity to evaluate the performance of two LCR probes under complex conditions. In the midsection of the frame, where uniaxial conditions are more dominant, the performance of the newer rotating wedge probe was shown to be statistically comparable to the earlier flexible strip probe. Comparison with strain gauge and finite element results and visual observations are used. © 2006 American Institute of Physics


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