Measuring residual stress using nonlinear ultrasound

M. Liu, J. Y. Kim, J. Qu, L. J. Jacobs

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

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.

Original languageEnglish
Title of host publicationReview of Progress in Quantitative Nondestructive Evaluation
Pages1365-1372
Number of pages8
DOIs
StatePublished - 2010
Event36th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE - Kingston, RI, United States
Duration: 26 Jul 200931 Jul 2009

Publication series

NameAIP Conference Proceedings
Volume1211
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference36th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE
Country/TerritoryUnited States
CityKingston, RI
Period26/07/0931/07/09

Keywords

  • NDE
  • Nonlinear ultrasound
  • Residual stress

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