5.1.3.4 Tongue and Groove Joint

A tongue and groove joint is made with an edge that consists of a groove running the entire length of the joint and a tongue that fits into the groove. This feature of the tongue and groove creates a mechanically strong and aesthetically pleasing joint. The greater the contact surface, the greater the distribution of stresses along the contact surface. This joint is well suited to a number of stresses, as the joint geometry counteracts many of the weaknesses exhibited under peel stress or stresses perpendicular to the bond line.

Figure 108 Tongue and groove joint
5.1.3.5 Strap Joint

Strap joints are very common in practical applications, such as repairs, and are generally used when overlap joints are impractical due to substrate thickness. They are also used as a reinforcement method to increase the bonding area and reduce peel stresses. The use of thick belts, also known as straps, with tapered or bevelled ends, can further reduce peeling stresses.

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