A comparative study on the effectiveness of system parameters in monitoring pre-load loss in bolted joints

AbstractThis article presents the monitoring of bolt loosening in a single bolted lap joint between two steel beams. The bolt loosening is initially studied using system modal parameters for various boundary conditions. Natural frequency and modal damping ratio in lower modes were not found to be reliable. Transmissibility function was seen to have a more reliable trend to identify the state of the joint. An in-house setup was developed to produce loosening in the bolted joint. Testing configuration was optimized by structural analysis. Strain measurements were carried out using Fiber Bragg-grating sensors while sinusoidal load was applied on the test structure. The results have been used to discuss a viable approach to identify the health of, or recognize a loosening trend, in a bolted joint.

[1]  G. Junker,et al.  New Criteria for Self-Loosening of Fasteners Under Vibration , 1969 .

[2]  Fu-Kuo Chang,et al.  Detection of bolt loosening in C–C composite thermal protection panels: II. Experimental verification , 2006 .

[3]  C. F. Beards,et al.  The Damping of Structural Vibration by Controlled Interfacial Slip in Joints , 1983 .

[4]  Michael D. Todd,et al.  An assessment of modal property effectiveness in detecting bolted joint degradation: theory and experiment , 2004 .

[5]  Miha Boltežar,et al.  Identification of the dynamic properties of joints using frequency response functions , 2008 .

[6]  Jonathan M. Nichols,et al.  Modeling and Detection of Joint Loosening using Output-Only Broad-Band Vibration Data , 2008 .

[7]  N. G. Pai,et al.  Experimental Study of Loosening of Threaded Fasteners due to Dynamic Shear Loads , 2002 .

[8]  Farid Taheri,et al.  Improvement of a vibration-based damage detection approach for health monitoring of bolted flange joints in pipelines , 2013 .

[9]  Atsushi Iwasaki,et al.  Three-dimensional Finite Element Analysis of Tightening and Loosening Mechanism of Threaded Fastener , 2005 .

[10]  D. J. Ewins,et al.  Modal Testing: Theory and Practice , 1984 .

[11]  Igor Sevostianov,et al.  Health monitoring of bolted joints via electrical conductivity measurements , 2010 .

[12]  C. Murthy,et al.  Structural Health Monitoring (SHM) Using Strain Gauges, PVDF Film and Fiber Bragg Grating (FBG) Sensors: A Comparative Study , 2006 .

[13]  Yang Wang,et al.  Mobile Sensor Networks: A New Approach for Structural Health Monitoring , 2010 .

[14]  D. P. Hess,et al.  BOLTED JOINT CLAMPING FORCE VARIATION DUE TO AXIAL VIBRATION , 1998 .

[15]  T. K. Gangopadhyay,et al.  Fibre Bragg gratings in structural health monitoring—Present status and applications , 2008 .

[16]  G. Wang,et al.  Fibre Bragg grating smart bolt monitoring creep in bolted GRP composite , 2002, 2002 15th Optical Fiber Sensors Conference Technical Digest. OFS 2002(Cat. No.02EX533).

[17]  Mark Seaver,et al.  Bragg grating-based fibre optic sensors in structural health monitoring , 2007, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[18]  Michele Meo,et al.  Structural health monitoring of bolted joints using linear and nonlinear acoustic/ultrasound methods , 2011 .

[19]  Takeru Watanabe,et al.  Loosening Evaluation of Bolt-Nut Fastener Under Transverse Cyclic Loading , 2013 .

[20]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

[21]  Vincent Caccese,et al.  Detection of bolt load loss in hybrid composite/metal bolted connections , 2004 .

[22]  Charles R. Farrar,et al.  A low-power wireless sensing device for remote inspection of bolted joints , 2009 .

[23]  Gary Cloud,et al.  Bolt tension monitoring with reusable fiber Bragg-grating sensors , 2016 .

[24]  Hamid Ahmadian,et al.  Identification of bolted lap joints parameters in assembled structures , 2007 .

[25]  John E. Mottershead,et al.  Experimental and theoretical studies of a bolted joint excited by a torsional dynamic load , 2006 .