Real-time detection of axial force for reliable tightening control

Chengzhou Li; Chao-Nan Xu; Yoshio Adachi; Naohiro Ueno

doi:10.1117/12.851697

14 April 2010 Real-time detection of axial force for reliable tightening control

Chengzhou Li, Chao-Nan Xu, Yoshio Adachi, Naohiro Ueno

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75223G (2010) https://doi.org/10.1117/12.851697
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

We developed a novel technique for bolt tightening control by utilizing SrAl2O4:Eu (SAOE) paint film to detect axial force generated during bolt tightening. Conventionally, torque method is prevalently used for bolt tightening control. The major problem of this method which indirectly controls the axial force in bolted joints is that only a small proportion of the torque actually contributes to the bolt extension. It is the axial force due to such an extension that fastens the bolted joints. Therefore, it is urgently necessary to directly measure the axial force in order to realize a smart tightening control. Considering the extension of bolt during tightening can induce elastico-luminescence of SAOE if it is painted on the bolt or washer, we have painted SAOE/polymer film on the washer and consequently measured elastico-luminescence of SAOE film while tightening the bolt under various conditions. In the present work, we also demonstrated the correlation between the elastico-luminescence intensity and tightening conditions including tightening speed and strain as well as axial force.

Citation Download Citation

Chengzhou Li, Chao-Nan Xu, Yoshio Adachi, and Naohiro Ueno "Real-time detection of axial force for reliable tightening control", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75223G (14 April 2010); https://doi.org/10.1117/12.851697

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