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Optical Monitoring and Control of Bolt Tightening

L. aser. x. B. eamsplitter. z. y. Object beam. PZT. Measuring direction. Before lo. ading. Reference. beam. a. Measuring. object. CCD array. L. ens. After loading. Optical Monitoring and Control of Bolt Tightening. Dr. Sayed Nassar, Advisor Aidong Meng.

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Optical Monitoring and Control of Bolt Tightening

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  1. L aser x B eamsplitter z y Object beam PZT Measuring direction Before lo ading Reference beam a Measuring object CCD array L ens After loading Optical Monitoring and Control of Bolt Tightening Dr. Sayed Nassar, AdvisorAidong Meng • Objectives and Methodology • Develop optical monitoring and control method for bolt tightening • Use 3-D Electronic Speckle Pattern Interferometry technique • Establish Torque-Tension-Deformation correlation • Determine a proper clamp load and tightening strategy Test Setup 3-D Electronic Speckle Pattern Interferometric sensor Schematic of single bolt joint Schematic diagram of ESPI for out-of-plane deformation measurement The bolted joint is fixed by a vice Results Tension-deformation correlation Deformation profile along line L1 Out-of-plane deformation field corresponding to 26 KN clamp load Deformation profile along line L2

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