Optical Monitoring and Control of Bolt Tightening
1
Optical Monitoring and Control of Bolt Tightening Dr. Sayed Nassar, Advisor Aidong 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 3-D Electronic Speckle Pattern Interferometric sensor Results Test Setup N ut Load Cell TestCoupon M 12 B olt FastenerH ead Schematic of single bolt joint The bolted joint is fixed by a vice Out-of-plane deformation field corresponding to 26 KN clamp load Deformation profile along line L 1 Deformation profile along line L 2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 0 5 10 15 20 25 30 Clam p load F(K N) Deformationw(um) Bolt1 Bolt2 Bolt3 Bolt4 Bolt5 Bolt6 Tension-deformation correlation z y x Laser B eamsplitter PZT CCD array Lens Reference beam Object beam Measuring direction Before lo ading After loading Measuring object Schematic diagram of ESPI for out-of-plane deformation measurement
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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. - PowerPoint PPT Presentation
Transcript of Optical Monitoring and Control of Bolt Tightening
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
3-D Electronic Speckle Pattern Interferometric sensor
Results
Test Setup
Nut
Load Cell
Test Coupon
M12 Bolt
Fastener Head
Schematic of single bolt joint
The bolted joint is fixed by a vice
Out-of-plane deformation field corresponding to 26 KN clamp load
Deformation profile along line L1
Deformation profile along line L2
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0 5 10 15 20 25 30
Clamp load F(KN)
Def
orm
ation
w(u
m)
Bolt 1
Bolt 2
Bolt 3
Bolt 4
Bolt 5
Bolt 6
Tension-deformation correlation
z y
x
Laser
Beamsplitter
PZT
CCD array Lens
Reference
beam
Object beam
Measuring direction
Before loading
After loading
Measuring
object
Schematic diagram of ESPI for out-of-plane deformation measurement
