An experimental investigation of the bolt clamping force and friction effect on the fatigue behavior of aluminum alloy 2024-T3 double shear lap joint

Abstract In this article, the effect of bolt clamping force on the fatigue life of bolted double shear lap joints was investigated. To do so, fatigue tests were carried out on the bolt clamped double shear lap joint specimens made of aluminum alloy 2024-T3. These fatigue tests were conducted with applied torques of 0.25, 2 and 4 N m at different cyclic longitudinal load levels in un-lubricated and lubricated states. From these tests the stress–life (S–N) data for different clamping forces for un-lubricated and lubricated states were obtained. The results show that clamping force increases fatigue life compared to clearance fit specimens. In general, at higher tightening torque higher fatigue lives were achieved, however, below a certain load level the life improvement was discontinued because of fretting phenomenon. Also lubricating the parts of the specimens reduces the advantage of clamping force or torque tightening.

[1]  Daniele Dini,et al.  Fretting fatigue and wear in bolted connections: A multi-level formulation for the computation of local contact stresses , 2009 .

[2]  Jeffrey Vogwell,et al.  A novel method of cold expansion which creates near‐uniform compressive tangential residual stress around a fastener hole , 2004 .

[3]  Hiroshi Kato,et al.  Ultrasonic detection of fretting fatigue damage at bolt joints of aluminum alloy plates , 2009 .

[4]  R. Starikov.  Fatigue behaviour of mechanically fastened aluminium joints tested in spectrum loading , 2004 .

[5]  Jeffrey Vogwell,et al.  The effect of cold expansion on improving the fatigue life of fastener holes , 2003 .

[6]  Krishnakumar Shankar,et al.  Fatigue behaviour of aluminium alloy 7075 bolted joints treated with oily film corrosion compounds , 2002 .

[7]  Onur Sayman,et al.  Experimental failure analysis of mechanically fastened joints with clearance in composite laminates under preload , 2008 .

[8]  Jeffrey Vogwell,et al.  Experimental and numerical investigation of the effect of clamping force on the fatigue behaviour of bolted plates , 2008 .

[9]  Jeffrey Vogwell,et al.  Experimental and numerical investigations into the effect of an interference fit on the fatigue life of double shear lap joints , 2009 .

[10]  Jeffrey Vogwell,et al.  Effect of torque tightening on the fatigue strength of bolted joints , 2006 .

[11]  T. N. Chakherlou,et al.  ON THE FATIGUE BEHAVIOR OF COLD EXPANDED FASTENER HOLES SUBJECTED TO BOLT TIGHTENING , 2011 .

[12]  Tomas Ireman,et al.  Design of composite structures containing bolt holes and open holes , 1999 .

[13]  Hiroyuki Terada.  Structural fatigue and joint degradation , 2001 .

[14]  T. N. Chakherlou,et al.  Reduction in clamping force due to applied longitudinal load to aerospace structural bolted plates , 2009 .

[15]  Jeffrey Vogwell,et al.  The effect of bolt clamping force on the fracture strength and the stress intensity factor of a plate containing a fastener hole with edge cracks , 2009 .

[16]  B. Abazadeh,et al.  Estimation of fatigue life for plates including pre-treated fastener holes using different multiaxial fatigue criteria , 2011 .

[17]  H. Saunders,et al.  An Introduction to the Design and Behaviour of Bolted Joints , 1983 .

[18]  Fu-Kuo Chang,et al.  Experimental study on clamping effects on the tensile strength of composite plates with a bolt-filled hole , 1999 .

[19]  J. M. Alegre,et al.  EFFECT OF CLAMPING FORCE ON THE FATIGUE BEHAVIOUR OF PUNCHED PLATES SUBJECTED TO AXIAL LOADING , 2006 .

[20]  Joseph Edward Shigley,et al.  Mechanical engineering design , 1972 .

[21]  J. Vogwell,et al.  The effect of cold expansion on fatigue resistance on fastener holes , 2013 .