An Experimental Method for Measuring Clamping Force in Bolted Connections and Effect of Bolt Threads Lubrication on Its Value
In this paper, the details of an experimental method to measure the clamping force value at bolted connections due to application of wrenching torque to tighten the nut have been presented. A simplified bolted joint including a holed plate with a single bolt was considered to carry out the experiments. This method was designed based on Hooke-s law by measuring compressive axial strain of a steel bush placed between the nut and the plate. In the experimental procedure, the values of clamping force were calculated for seven different levels of applied torque, and this process was repeated three times for each level of the torque. Moreover, the effect of lubrication of threads on the clamping value was studied using the same method. In both conditions (dry and lubricated threads), relation between the torque and the clamping force have been displayed in graphs.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1333198Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 6936
 Valtinat G, Hadrych I, Huhn H. Strengthening of riveted and bolted steel constructions under fatigue loading by preloaded fasteners-experimental and theoretical investigations. Proceedings of the international conference on Connections in Steel Structures IV, AISC and ECCS, Roanoke, USA, 2000
 Ireman T. Design of composite structures containing bolt holes and open holes. Report No. 99-03, Royal Institute of Technology, 1999.
 Chakherlou TN, Vogwell J. A noval method of cold expansion which creates near uniform compressive tangential residual stress around a fastener holes. Fatigue Fract Engng Mater & Struct 27 (2004) 343-351.
 Chakherlou TN, Vogwell J. The effect of cold expansion on improving the fatigue life of fastener holes. Engineering Failure Analysis 10 (2003) 13-24.
 Vogwell J, Chakherlou TN, Minguez JM. The effect of cold expansion on fatigue resistance of fastener hole. The 10th international congress of fracture, ICF10022OR. 2001.
 Rich DL, Impellizzeri LF. Fatigue analysis of cold worked and interference fit fastener holes, cyclic stress-strain and plastic deformation aspect of fatigue crack growth. American Society for Testing and Materials, ASTM STP 1977; 637:154-75.
 Shigley JE, Mischke CR. Mechanical Engineering Design. 6th Ed, McGraw-Hill, pp. 470-473, 2001.
 Yan Y, Wen WD, Chang FK, Shyprykevich P. Experimental study on clamping effects on the tensile strength of composite plates with a boltfilled hole. Composites: Part A 30 (1999) 1215-1229.
 Blake JC, Kurtz HJ. The Uncertainties of Measuring Fastener Preload. Machine Design, vol. 37, pp. 128-131, 1965.
 Oskouei RH. An investigation into bolt clamping effects on distributions of stresses and strains near fastener hole and its effect on fatigue life. MSc thesis, University of Tabriz, 2005, Chapter 3.