Advantages of Adhesive Bonding

The advantages of adhesive bonding include:2

• Bonding provides a more uniform stress distribution than mechanical fasteners by eliminating the individual stress concentration peaks caused by mechanical fasteners. As shown in Fig. 8.1, the stress distribution across the joint is much more uniform for the adhesive bonded joint than for the mechanical joint, leading to better fatigue life than that for mechanically fastened joint. Bonded joints also provide superior vibration and damping capability.

• Due to the elimination of mechanical fasteners, bonded joints are usually lighter than mechanically fastened joints and are less expensive in some applications.

• Bonded joints enable the design of smooth external surfaces and integrally sealed joints with minimum sensitivity to fatigue crack propagation. Dissimilar materials can be assembled with adhesive bonding and the joints are electrically insulating, preventing galvanic corrosion of metal adherends.

• Bonded joints provide a stiffening effect compared to riveted or spot welded constructions. While rivets or spot welds provide local point stiffening,

Mechanical Joint

Bonded Joint

Mechanical Joint

Bonded Joint

Mechanical Joint

Unstiffened Area

Mechanical Joint

Unstiffened Area

Bonded Joint

Fig. 8.1. Load Distribution Comparison for Mechanically Fastened and Bonded Joints2

bonded joints provide stiffening over the entire bonded area. The significance of this effect is shown in Fig. 8.1, where bonded joints may increase the buckling strength of the structure by as much as 30-100%.

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