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Research Papers

On the Design of Interference-Fitted and Adhesively Bonded Joints for Lightweight Structures

[+] Author and Article Information
Dario Croccolo1

Nicolò Vincenzi

 DIEM, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italynicolo.vincenzi@unibo.it

1

Corresponding Author.

J. Mech. Des 133(5), 051006 (Jun 06, 2011) (8 pages) doi:10.1115/1.4003921 History: Received November 22, 2010; Revised March 28, 2011; Published June 06, 2011; Online June 06, 2011

Interference-fitted and adhesively bonded joints are hybrid fastening systems that involve a hub (cylindrical or asymmetric) and a shaft (solid or hollow) locked together by both a frictional force (based on the radial pressure and the Coulomb friction law) and an adhesive strength generated at their coupling surfaces. Total interface forces allow the transmission of a high torque moment and/or a high axial force with respect to the joint dimension so that hybrid joints are demonstrated to be a smart solution for lightweight structures. This paper investigates the optimal combinations of geometrical parameters (ratios between internal and external diameters of the shaft and the hub) in order to maximize the axial load transmitted by the joint as well as to save the weight of the structure. Some design formulae, based on the maximum shear (Tresca) yield criterion, are proposed as a function of different materials for both the shaft and the hub (steel, aluminum, magnesium, and titanium).

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Fundamental parameters for the interference-fitted joints

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Figure 2

Example of DFLS trend for different values of coupling diameter DC

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Figure 3

Example of DFLS trend for different values of QS

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Figure 4

Example of DFLS trend (39NiCrMo3, DC  = 50 mm): (a) 3D representation—intersection between DFLS calculated via pC_H and pC_S ; (b) 2D representation of the same curves—dashed lines represent combinations of QS and QH that need DFLS calculated via pC_S

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Figure 5

DFLS trend for different material of the hub coupled with steel shaft

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Figure 6

DFLS trend for different materials of the hub coupled with titanium shaft

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Figure 7

DFLS trend in presence of adhesive for different materials of the hub coupled with (a) steel shaft, (b) titanium shaft

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Figure 8

Improvement factor i calculated in absence [(a), steel shaft; (b), titanium shaft] and in presence [(c), steel shaft; (d), titanium shaft] of adhesive

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