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

FME Transactions

Najafabadi Ahmadi M.¹  Sadeghi S.²  Hasani M.²  Karimi Zarif N.³  Pavlović A.⁴  Fotouhi M.⁵ 

[1] Amirkabir University of Technology Department, of Mechanical Engineering, Iran;Amirkabir University of Technology, Department of Mechanical Engineering, Iran;Department of Industrial Engineering, Italy;University of Bologna, Department of Mechanical Engineering, Italy;University of Bristol, Department of Aerospace Engineering, UK;

关键词: residual stress;    acoustic emission;    ultrasonic stress measurement;    sentry function;    crest factor;    friction stir welding;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown