Feasibility study of residual stress measurement using phased ‎array ultrasonic method

Javadi, Yashar and Hutchison, Alistair and Singh, Jonathan and Mohseni, Ehsan and Rahimi, Salah and Mehnen, Jorn and MacLeod, Charles Norman and Pierce, Gareth and Tant, Katherine Margaret Mary and Gachagan, Anthony (2022) Feasibility study of residual stress measurement using phased ‎array ultrasonic method. In: 11th International Conference on Residual Stress, 2022-03-27 - 2022-03-30, Centre Prouve.

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Residual stress measurement using the ultrasonic method is based on the acoustoelasticity law, which ‎states that the Time-of-Flight (ToF) of an ultrasonic wave is affected by the stress field. Traditionally, single-element ultrasonic transducers are used for residual stress measurement. In ‎this paper, a Phased Array Ultrasonic Testing (PAUT) system is used and the single ‎element transducers are replaced by 5 MHz and 10 MHz arrays with 8 and 16 elements, respectively. The 10 MHz transmitter array can generate 16 ultrasonic waves ‎and each of them can be received by any of the 16 elements of the 10 MHz receiver array. ‎Therefore, a matrix of 16 × 16 acoustic paths can potentially be generated. Each of these 256 LCR paths ‎is different from the others (i.e., different distance or different position of the travel path in the ‎material) whereby 256 ToFs can be generated. This is anticipated to increase the measurement ‎accuracy in comparison with the traditional setup in which only two acoustic paths can be generated by using three single element transducers. In this paper, a feasibility study is ‎conducted to investigate the requirements of a residual stress measurement system using the PAUT method. An advanced processing algorithm is also developed to analyse Full Matrix ‎Capture (FMC). Based on the preliminary results, some variations between different acoustic paths are ‎measured which prove that the effect of the residual stress on the ultrasonic wave is detectable using ‎the PAUT system.‎ Furthermore, the potential of this system for robotic residual stress measurement is discussed.