@inproceedings{3d84eacd55cf47b9a9691f138a928035,
title = "Measuring residual stress using nonlinear ultrasound",
abstract = "Near-surface compressive residual stresses, which are generated by shot peening, are known to retard crack initiation and thus extend the fatigue life of a metal component. The ability to effectively measure these near-surface residual stresses would greatly help predict the fatigue life of shot-peened components. This research uses the nonlinear surface acoustic wave technique to measure the residual stresses in a shot-peened component. Experiments are conducted on three different aluminum alloy (AA 7075) samples: as-received with no peeing, and shot-peened at the Almen intensities of 8A and 16A. Surface roughness measurements are also carried out for these three samples. The nonlinear ultrasonic results show that the measured acoustic nonlinearity parameter increases by 81% and 115% for the 8A and 16A samples. These large increases in measured acoustic nonlinearity clearly indicate the potential of the nonlinear ultrasonic technique as an NDE tool to measure the near-surface residual stresses. The effects of surface roughness on the ultrasonic measurement are briefly examined. Finally, a preliminary model prediction is presented to interpret the experimental results.",
keywords = "NDE, Nonlinear ultrasound, Residual stress",
author = "M. Liu and Kim, {J. Y.} and J. Qu and Jacobs, {L. J.}",
year = "2010",
doi = "10.1063/1.3362226",
language = "English",
isbn = "9780735407480",
series = "AIP Conference Proceedings",
pages = "1365--1372",
booktitle = "Review of Progress in Quantitative Nondestructive Evaluation",
note = "36th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE ; Conference date: 26-07-2009 Through 31-07-2009",
}