A digital speckle pattern interferometry (DSPI) system is developed for the real-time measurement and monitoring of the out-of-plane surface deformation around a preloaded bolt head or nut. The proposed system is specifically developed for the dynamic control of the bolt tightening process by continuously monitoring the out-of-plane joint surface deformation that will have been independently correlated to the bolt preload. Spatial phase shifting is employed to quantitatively determine the distribution of phase data by introducing a spatial carrier fringe pattern to the speckle interferogram. This is achieved by leading the object and reference beams through two separate apertures. The configuration is also suitable for collecting the real-time surface deformation during bolt tightening. The experimental DSPI system is set-up with optical components on a vibration-isolation table. A MATLAB software is developed for image acquisition and phase data calculations that yield the out-of-plane surface deformation caused by the bolt preload. The test fixture uses an M12 steel fastener and aluminum joint. For miniature screw applications, however, a plastic joint is used.
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December 2011
Research Papers
A Novel Optical Method for Real-Time Control of Bolt Tightening
Aidong Meng,
Aidong Meng
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
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Sayed A. Nassar,
Sayed A. Nassar
Fellow ASME
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
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Douglas Templeton
Douglas Templeton
US Army TARDEC, Warren, MI 48397-5000
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Aidong Meng
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
Sayed A. Nassar
Fellow ASME
Department of Mechanical Engineering, Fastening and Joining Research Institute,
Oakland University
, Rochester, MI 48309
Douglas Templeton
US Army TARDEC, Warren, MI 48397-5000
J. Pressure Vessel Technol. Dec 2011, 133(6): 061211 (5 pages)
Published Online: November 4, 2011
Article history
Received:
September 29, 2010
Revised:
July 7, 2011
Online:
November 4, 2011
Published:
November 4, 2011
Citation
Meng, A., Nassar, S. A., and Templeton, D. (November 4, 2011). "A Novel Optical Method for Real-Time Control of Bolt Tightening." ASME. J. Pressure Vessel Technol. December 2011; 133(6): 061211. https://doi.org/10.1115/1.4004797
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