Optical Monitoring of Bolt Tightening Using 3D Electronic Speckle Pattern Interferometry

[+] Author and Article Information
Sayed A. Nassar, Aidong Meng

Fastening and Joining Research Institute Department of Mechanical Engineering,  Oakland University, Rochester, MI 48309

J. Pressure Vessel Technol 129(1), 89-95 (Jan 04, 2006) (7 pages) doi:10.1115/1.2389024 History: Received May 09, 2005; Revised January 04, 2006

An optical method is presented for the real-time monitoring of the bolt tightening process that provides the necessary clamping force in bolted assemblies. The method uses the 3D electronic speckle pattern interferometry (ESPI) technique to measure and monitor the joint deformation and strain fields in the joint around the tightened fastener, and establish a reliable correlation with the clamp load provided by the fastener tightening. Because the relationship between the clamp load and joint deformation is independent of the frictional variables of the fastener, the direct monitoring of the deformation and strain fields in the clamped joint would provide a more reliable measure of the clamp load level, as compared to the conventional reliance on the tightening torque to predict the resulting clamp load level. This technique is beneficial, especially for monitoring, with high precision, the proper tightening of critical bolted connections such as those used in many pressure vessels in the nuclear power industry. The validity of the optical technique is also ascertained by comparing the results to that obtained by using finite element analysis and other classical mechanics of materials methods.

Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Schematic diagram of the ESPI for the out-of-plane deformation measurement

Grahic Jump Location
Figure 2

Schematic diagram of the ESPI for the in-plane deformation measurement

Grahic Jump Location
Figure 3

(a) Schematic of the single bolt joint; (b) plan view of the test coupon and measured area; (c) the bolted joint is fixed by a vice

Grahic Jump Location
Figure 5

Out-of-plane deformation w(μm) field by the ESPI system at the 26kN clamp load

Grahic Jump Location
Figure 6

Out-of-plane deformation w(μm) profile along L1

Grahic Jump Location
Figure 7

Out-of-plane deformation w(μm) profile along line L2

Grahic Jump Location
Figure 8

Torque-clamp load curves obtained from experiments for six bolts used as-received

Grahic Jump Location
Figure 9

Deformation-clamp load curves from experiments and FEM

Grahic Jump Location
Figure 10

Phase map of deformation w corresponding to the initial load of 4kN

Grahic Jump Location
Figure 11

The deformation phase map corresponding to the increment of the lamp load from 8.4kN to 14.9kN

Grahic Jump Location
Figure 12

Distributed load q on the elastically supported beam

Grahic Jump Location
Figure 13

Theoretical and experimental data correlation

Grahic Jump Location
Figure 14

The bolted joint solid model

Grahic Jump Location
Figure 15

The bolted joint symmetrical FEA model




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In