Influence of the engagement ratio on the joint strength of press fitted and adhesively bonded specimens

Abstract Press fitted and adhesively bonded joints give several advantages: among others, they lead to smaller constructions for a given load capacity, or to stronger constructions for a given size. For that reason, the static and fatigue strength properties of these joints have been studied extensively. Studies dealing with the influence of the engagement ratio (i. e. the coupling length over the coupling diameter) are still limited. This work aims at filling the gap, limited to the case of a single component anaerobic adhesive. Coupling and decoupling tests have been performed both on press-fitted and adhesively bonded specimens and on pin–collar samples, considering four different levels for the engagement ratio. The study shows that the engagement ratio has a negligible effect on the shear strength of the adhesive and also on the relationship between the decoupling and the coupling forces. Moreover, the obtained results show that a too high interference level in press-fitted and adhesively bonded joints may have a detrimental effect on the adhesive strength.

[1]  J. Comyn,et al.  Structural Adhesive Joints in Engineering , 1984, The Aeronautical Journal (1968).

[2]  G. Bartolozzi,et al.  Research on shaft-hub adhesive and compresion coupling , 1999 .

[3]  Alessandro Freddi,et al.  In‐Field Measurement of Forces and Deformations at the Rear End of a Motorcycle and Structural Optimisation: Experimental–Numerical Approach Aimed at Structural Optimisation , 2008 .

[4]  A. Gulsoz,et al.  The effects of bonding clearance and interference fit on the strength of adhesively bonded cylindrical components , 2005 .

[5]  D. Castagnetti,et al.  Predicting the macroscopic shear strength of adhesively-bonded friction interfaces by microscale finite element simulations , 2012 .

[6]  Alessandro Freddi,et al.  Fatigue on Shot‐Peened Gears: Experimentation, Simulation and Sensitivity Analyses , 2010 .

[7]  N. Vincenzi,et al.  Experimental Analysis of Static and Fatigue Strength Properties in Press-Fitted and Adhesively Bonded Steel–Aluminium Components , 2011 .

[8]  Dario Croccolo,et al.  Static and dynamic strength evaluation of interference fit and adhesively bonded cylindrical joints , 2010 .

[9]  Giorgio Olmi.  Investigation on the Influence of Temperature Variation on the Response of Miniaturised Piezoresistive Sensors , 2009 .

[10]  D. Croccolo,et al.  Influence of the assembly process on the shear strength of shaft–hub hybrid joints , 2013 .

[11]  J. Häberle,et al.  Mechanical properties of hub/shaft joints adhesively bonded and cured under hydrostatic pressure , 2007 .

[12]  Robert E. Maurer,et al.  Experimental Design with Applications in Management, Engineering and the Sciences , 2001 .

[13]  E. Dragoni.  Fatigue testing of taper press fits bonded with anaerobic adhesives , 2003 .

[14]  Giorgio Olmi.  Low Cycle Fatigue Experiments on Turbogenerator Steels and a New Method for Defining Confidence Bands , 2012 .

[15]  Eugenio Dragoni,et al.  Cumulative static strength of tightened joints bonded with anaerobic adhesives , 2002 .

[16]  Tezcan Sekercioglu,et al.  Shear strength estimation of adhesively bonded cylindrical components under static loading using the genetic algorithm approach , 2005 .

[17]  Dario Croccolo,et al.  Failure analysis of bolted joints: Effect of friction coefficients in torque–preloading relationship , 2011 .

[18]  A. Gulsoz,et al.  The effects of surface roughness on the strength of adhesively bonded cylindrical components , 2003 .

[19]  Dario Croccolo,et al.  Friction Coefficient Definition in Compression-fit Couplings Applying the DOE Method , 2008 .

[20]  Robert D. Adams,et al.  Joint strength predictions for adhesive joints to be used over a wide temperature range , 2007 .

[21]  Giorgio Olmi.  A new loading-constraining device for mechanical testing with misalignment auto-compensation , 2011 .

[22]  E. Dragoni,et al.  Intrinsic static strength of friction interfaces augmented with anaerobic adhesives , 2000 .

[23]  H. Kawamura,et al.  Effect of fitted position on stress distribution and strength of a bonded shrink fitted joint subjected to torsion , 2003 .