Residual stress evaluation in friction stir welding of aluminium plates by means of acoustic emission and ultrasonic waves

Sadeghi, S., Karimi, Z., Fotouhi, M. , Hasani, M., Najafabadi, M. A. and Pavlović, A. (2018) Residual stress evaluation in friction stir welding of aluminium plates by means of acoustic emission and ultrasonic waves. FME Transactions, 46, pp. 230-237. (doi: 10.5937/fmet1802230S)

Abstract

The residual stress assessment in structures is essential for optimization of the structures’ design. The attention of this paper is focused on how acoustic emission signals caused by tensile loading of the friction stir welded aluminum plates are expected to vary depending upon the residual stress. To this aim, the distribution of residual stresses in two friction stir welded aluminum specimens was firstly evaluated by ultrasonic stress measurement. AE signals were then produced during tensile tests and captured using AE sensors. The obtained AE signals were analyzed using statistical features including crest factor, cumulative crest factor and sentry function. It was found that the crest factor could be used to identify the presence of the residual stresses and that the trends of sentry function are in good agreement with the results of crest factor and cumulative crest factor.

• Item Type: Articles (Editorial)
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Fotouhi, Dr Mohammad
• Authors: Sadeghi, S., Karimi, Z., Fotouhi, M., Hasani, M., Najafabadi, M. A., and Pavlović, A.
• Subjects: T Technology > TA Engineering (General). Civil engineering (General); T Technology > TJ Mechanical engineering and machinery
• College/School: College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
• Journal Name: FME Transactions
• Publisher: University of Belgrade Faculty of Mechanical Engineering
• ISSN: 1451-2092
• ISSN (Online): 2406-128X
• Copyright Holders: Copyright © 2018 Department of Mechanical Engineering, Forli.
• First Published: First published in FME Transactions 46:230-237
• Publisher Policy: Reproduced under a Creative Commons license