Forward to residual stress measurement by using pulsed eddy current technique

A. Habibalahi, M. S. Safzadeh*

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The presence of residual stress in any material can have an infuence on its mechanical properties, such as creep or fatigue life. Two common non-destructive methods, X-ray diffraction and ultrasound, are not reliable methods for subsurface residual stress measurement and the destructive hole-drilling method is not absolutely precise and safe. Recently, the non-destructive eddy current method has been applied to residual stress estimation, but it is only useful for surface residual stress measurements. This paper presents an application of the pulsed eddy current (PEC) method for stress measurement. PEC, as a highperformance non-destructive testing technique, has greater penetration than the conventional eddy current technique. In this study, the capability of PEC for subsurface residual stress measurement is investigated. After acquiring the PEC response to applied stresses, signals are initially analysed in a qualitative manner. Then, by the application of signal processing methods to the PEC signals, a quantitative approach for measuring residual stress is developed. Finally, a calibration curve for an aluminium specimen is made after data classifcation using experimental test data. The error of estimating residual stress by the calibration curve is evaluated and results show the potential of the PEC method for residual stress measurement.

Original languageEnglish
Pages (from-to)492-497
Number of pages6
JournalInsight: Non-Destructive Testing and Condition Monitoring
Volume55
Issue number9
DOIs
Publication statusPublished - Sep 2013
Externally publishedYes

Keywords

  • Non-destructive testing (NDT)
  • Pulsed eddy current (PEC)
  • Residual stress measurement

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